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1[[quoteright:350:https://static.tvtropes.org/pmwiki/pub/images/tensei_slime.png]]
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3[[caption-width-right:350:Our protagonist, Rimuru: slime... and human. [[note]]Center (blue hair): Rimuru (human form), Black hair: Shizu (holding Rimuru's slime form). Clockwise from bottom: Ranga, Gobta, Rigurd, Milim, Ramiris, Soei (peeking from right), Shion (purple hair), Shuna (pink hair), Hakuro (at edge), Benimaru[[/note]]]]
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5After dying while protecting his junior colleague at work from a knife attack, Satoru Mikami is reincarnated as in a magical world, and [[BeCarefulWhatYouWishFor due to his last thoughts and desires]], he's a slime. As someone who is reincarnated, he gains the Skills "Predator" and "Great Sage". While strolling around, he meets the Storm Dragon Veldora who becomes his friend and names him Rimuru. In return, Rimuru gives the surname Tempest to both of them and agrees to consume the magical cage trapping Veldora, so that one day they can permanently break Veldora's imprisonment. The mysterious disappearance of the Storm Dragon results in huge consequences as his presence acted as a sort of buffer zone. Meanwhile, Rimuru starts his adventure by traveling, meeting new people, fighting some of them, and turning them into allies by fighting them. He is guided by a mysterious interface, the Great Sage, which teaches him how to use his unique skill, "Predator", an almost limitless ability to eat and assimilate living things and objects. Rimuru begins to adopt the forms and abilities of everything he absorbs, which makes him very strong, but also a target.
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7''That Time I Got Reincarnated as a Slime'' (''Tensei Shitara Slime Datta Ken'') is a series of web-novels turned light novels by Fuse and illustration by Mitz Vah. This series is adapted to manga by Taiki Kawakami and an anime by Studio 8 bit. On September 21, 2021, following the conclusion of Season 2, a movie titled ''That Time I Got Reincarnated as a Slime the Movie: Scarlet Bond'' was announced and released on November 25, 2022. On February 20, 2023, a three-part OVA titled ''That Time I Got Reincarnated as a Slime: Visions of Coleus'' was announced and released on November 1, 2023, adapting a four-part original short story set between Seasons 1 and 2 of the anime.
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9It also spawned SpinOff Manga including:
10* ''The Ways of Strolling in the Demon Country''/''How the Monster Country Works''/''A Travel Guide to the Land of Monsters'' (転生したらスライムだった件~魔物の国の歩き方~ ''Tensei Shitara Slime Datta Ken: Mamono no Kuni no Arukikata'') (2016-): A series about Rabbit Girl Flamia exploring Rimuru's country and takes place further in the story.
11* ''The Slime Diaries: That Time I Got Reincarnated as a Slime''/''The Slime Diaries''/''Reincarnated Slime Diary'' (転スラ日記 転生したらスライムだった件 ''Tensura Nikki Tensei Shitara Slime Datta Ken'') (2018-): A {{Fourkoma}} about Rimuru and friends ([[VillainsOutShopping and sometimes villains]]) in their daily lives. An anime adaptation aired from April to June 2021, in the interim between part 1 and part 2 of the main anime's second season.
12* ''That Time I Got Reincarnated as a Corporate Slave'' (転生しても社畜だった件 ''Tensei Shite mo Shachiku Datta Ken'') (2018-): A series about Rimuru reawakening in the real world in a {{salaryman}} job similar to his previous life as Mikami, but still in his slime body.
13* ''That Time I Got Reincarnated as a Slime Another Story: Trinity of the Magic Kingdom'' (転生したらスライムだった件 異聞 ~魔国暮らしのトリニティ~ ''Tensei shitara Slime datta Ken Ibun: Makuni Kurashi no Trinity'') (2019-)
14* ''That Time I Got Reincarnated as Kosaku Shima'' (転生したら島耕作だった件 ''Tensei Shitara Shima Kōsaku Datta Ken''): A {{crossover}} where Mikami awakens as 37-year old businessman ''Manga/KosakuShima'' instead of a slime.
15* (転ちゅら! 転生したらスライムだった件 ''Tenchura! Tensei Shitara Slime Datta Ken'') (2019): A {{Fourkoma}} about Rimuru where turns into a three-year old body after obtaining a human body rather then an adult.
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17And VideoGames including:
18* ''That Time I Got Reincarnated as a Slime: Lord of Tempest'' (''Tensei Shitara Slime Datta Ken ~Makoku Renpou Souseiki~'') (December 30, 2018) A 2D turn-based role-playing and city-building game for iOS and Android.
19* ''That Time I Got Reincarnated as a Slime: ISEKAI Memories'' (''Tensei Shitara Slime Datta Ken: Maō to Ryū no Kenkoku-tan'') ( October 28, 2021): A 3D battle role-playing and city-building game for iOS and Android that introduced two original characters by the names of Shinsha (a slime who self-proclaims herself as Rimuru's daughter) and Izis (a mysterious Witch of Mirrors who can summon alternate versions of ''Slime'' characters).
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21It also had several crossover events with other isekai such as ''Literature/{{Konosuba}}'' and ''Literature/Overlord2012'', with major characters from both being [[TrappedInAnotherWorld brought to]] the ''Slime'' world via dimensional rifts and needing to find their way back while teaming up against inter-dimensional threats.
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23There was also a crossover event for ''VideoGame/LastCloudia''.
24----
25[[foldercontrol]]
26[[folder:Tropes A-C]]
27!!''That Time I Got Reincarnated as a Slime'' provides examples of the following:
28* ActorAllusion: This isn't the first time Creator/TiaBallard voiced [[Anime/DarlingInTheFranxx a pink-haired oni girl with two horns on her head.]]
29* AdaptationalAttractiveness: {{Zig Zagg|ingTrope}}ed a bit with the "Slime Diaries" spinoff. As a whole, all of the characters receive rounder, cuter designs that make even the roughest-looking among them (like Geld) outright cuddly, but any of the normally hot and sexy characters (like Shion and Benimaru) trade the attractiveness for enhanced cuteness due to this art-style change.
30* AdaptationalPersonalityChange: Several characters received notable changes to their personalities between versions (web novel, light novel, manga, and anime), as noted in each of their character entries.
31* AdaptationDistillation: The anime cuts out some of the side character arcs and compresses other things for the sake of pacing while still keeping some of the manga's expansions (Such as Shizu's backstory). For example, the "Adventurer's Arc" (a minor arc which shows how Rimuru got his Adventurer's License, sheds some spotlight on how the AdventureGuild works, and gives Elen, Kabal, and Gido some additional expansion and screentime) isn't covered by the anime specifically, but rather gets shown in the first Opening of Season 2, showing Rimuru about to head out with the three adventurers, as well as his "examination" fighting a set of monsters to boost his Rank from F to B [[CurbStompBattle with each "set" ending about as quickly in the fast-paced animation as they did in the light novel and manga]].
32* AdaptationExpansion:
33** The light novel is fairly bare bones in presentation. For example, the character of Shizue has ''no speaking lines'' apart from asking to join the adventurers before succumbing to possession, nor does she actually do anything like torch giant ants to show off her strength. She just joins the party, is silent until meeting Rimuru, gets possessed, beaten and then dies while wishing for him to get revenge on Leon Cromwell for her.
34** While the RapidFireComedy nature of a {{yonkoma}} comedy is still present, the anime adaptation of ''The Slime Diaries'' heavily expands on all of the gags, taking what were four-panel quick jokes and turning them into full-blown scenarios that last at least a minute each.
35* AdventureGuild: The Free Guild, founded within Ingracia by the Otherworlder Yuuki Kagurazaka, functions as this. Notably, he reworked the original adventurer society into an internationally-accepted organization that helps fight monsters and better provides quality of life for humans. [[spoiler:The irony being that he's actually the BigBad, though in the light novel he's legitimate in having them do good. In the web novel they were meant to hold up his VillainWithGoodPublicity angle.]]
36* AlphabeticalThemeNaming: When naming the goblins, Rimuru just goes through the Japanese syllabary in order, with "gob" in front: Gobta, Gobte, Gobtsu, etc.
37* AnatomyOfTheSoul: Souls are divided into three parts. The astral body that connects it with the physical body, a core that builds a protective shell and finally, inside the core, the nucleic Heart where the ego of a person dwells.
38* AntiMagic: Certain spells and weapons are designed to be capable of bypassing or even negating [[{{Mana}} magicules]], which can not only disable Elemental/Aspectual Magics, but also inflict noticeable harm or at least act as a PowerNullifier on monsters since they're MadeOfMagic. However, contrary to what many humans think, this isn't absolute. In addition to just being [[ScissorsCutsRock so much stronger than the anti-magic to not be affected]], several types of magic outright bypass regular anti-magic because their rules work differently. Spiritual Magic, for example, relies on a contract with and utilizing the powers of an Elemental Spirit, whose powers are based solely in natural phenomena rather than unnaturally affected by magicules, and so it can't be affected by regular anti-magic. This last part is why Megiddo is so dangerous, since it is a ''physical'' based spell that is not dependent on magicules to kill, just magnified beams of sunlight with temperature ranges at several thousand degrees.
39* TheArmiesOfHeaven: The angels are the personal armies of [[DragonsAreDivine Veldanava]] that fight to protect the world from interdimensional invasions. And then Veldanava [[GodIsDead died]] because of the world's mortal races and the angels continued that duty while also nursing a deep grudge against them, which manifested in descending every 500 years to launch attacks on advanced civilizations to uphold MedievalStasis. [[spoiler:They then descend into full-on OmnicidalManiac territory with the prompting of the {{Big Bad}}'s MindControl.]]
40* ArmorIsUseless: Some characters wear armor, others don't, and it rarely makes any difference. A special mention goes to a scene in the anime version where a lizardman warrior kills an armored orc by ''slashing his speartip across the latter's fully armored back''. Downplayed somewhat as high quality armor is ''anything'' but useless, and Tempest's entire army is outfitted with armor designed for their species, so it has some effectiveness at lower ranks.
41* ArtifactName: The otherwise NonIndicativeName given to every non-demon "Demon Lord" originated with Guy Crimson, as the first independent demon to achieve his level of power. When creatures of similar strength started to appear, the name became a catch-all term, as each of them grew to be just as feared.
42* AsskickingLeadsToLeadership:
43** In contrast to how humans and human-like races (dwarves and elves) maintain their rulership based on their capacity to lead regardless of personal power (there are strong human, dwarf, and elf leaders, but their power is secondary to how well they command their nations), completely inhuman races like monsters and demons maintain hierarchies based on who is the strongest. The absolute rulers of each non-human-based nation are the absolute strongest among them, along with all secondary leaders underneath them being leagues stronger than the regular soldiers. As a result of this power hierarchy, the idea of RoyalsWhoActuallyDoSomething and {{Frontline General}}s is present everywhere. Additionally, inhuman biology also incorporates RankScalesWithAsskicking, as gaining a higher position in a hierarchy boosts a monster's abilities to ''make'' them better asskickers, with more asskicking-earned authority instilling higher amounts of rank-granted asskicking power.
44** Up to eleven in demon society as a whole. As demons are spiritual beings by nature [[BloodKnight who constantly fight each other]] in {{Hell}}, death leads to reincarnation, but in turn this shaves off some of their magicule supply with each resurrection. Enough losses in a row without recovery will actually result in a demon ''devolving'', and once a demon hits Archdemon, they hit their natural "cap" and must rely on knowledge, experience, and cunning to hold their own. According to Diablo, the only way to reach the next stage of Demon Peer is to ass-kick your way to Archdemon, then maintain an undefeated chain of victories (or at bare minimum avoiding death and resurrection) for ''at least'' [[TimeAbyss 2,000 years]]. It's notable that among confirmed Demon Peers, the only other ones aside from the [[MonsterProgenitor Primordials]] are Veyron and Moss, who achieved unbroken win streaks for 4,000 years and ''10,000'' years respectively.
45** While it's technically a human-dominated nation, the Eastern Empire holds this ideal for their military, complete with official and organized methods of ChallengingTheChief to rapidly advance in the ranks. The commanders of the three main divisions of the army are ''expected'' to be capable of defeating literally everyone else under them in said division. They also have no issue employing Otherworlders or even certain monsters into their ranks and giving them command positions if they're strong enough; the strongest member of the fourth "division"/PraetorianGuard and head of Empire intelligence is the former while the actual Marshall who is the Command-in-Chief is the latter.
46* AuthorAppeal: The author very clearly has a thing for {{Cute Monster Girl}}s, including BizarreSexualDimorphism with dragonewts and eventually including hot demon girls.
47* AwakeningTheSleepingGiant: Averting this is a big reason why foreign nations are willing to make deals with Tempest, a nation of monsters. A nation of '''over ten-thousand named monsters''' acting in unison could rain hell on any nation dumb enough to punch first. [[spoiler:Falmuth and the [[TheEmpire Eastern Empire]] learned this the hard way.]]
48--> '''Hakurou:''' Our ruler is making his way towards that very battlefield. You people have gone too far. You angered the one person whose rage you should fear the most. You have my sympathy. Your death will not be painless.
49* AwesomeButImpractical: Several of the "test phase" weapons and armor Kurobee and his apprentices craft fall under this, mostly due to lacking RequiredSecondaryPowers.
50** One suit of mail sucks at the wearer's magical force to erect a continuous and powerful magic barrier...but drains the magic power whether the wearer wants it to or not, eventually killing them from the drain. It has a corresponding sword that has a LifeDrain effect...but also includes the user. The forger actually almost ''died'' during the creation process. [[spoiler:Rimuru ends up giving them to Albert, as since he's TheUndead he has no life force to drain.]]
51** A sword that attracts all magicules in the local area like a magnet and transforms them into [[HavingABlast explosive force]]. Great for making it [[AntiMagic impossible to cast any spells]] while providing a devastating attack...but it provides no protection whatsoever for the wielder itself from the explosions.
52** A suit of armor that grants the user [[HourOfPower extraordinary physical strength for a limited time]]. Amazing, but once that time expires, the wearer's ''[[BodyHorror muscles all rupture]]'', leaving them motionless and dead unless they or someone nearby has healing magic on hand.
53* AwesomenessIsAForce: Downplayed with King Dwargo who is described by Rimuru as 'exuding an aura of raw power'. It's later revealed this is an actual technique known as "Haki", where the user exerts their aura as spiritual pressure on their surroundings. At higher tiers, a person can use their Haki to immobilize targets, induce madness, or even kill anyone with insufficient willpower or Haki of their own without moving a finger.
54* BackFromTheBrink: Aptly described in Episode 47, "Returning from the Brink", with the twist being that [[spoiler:it's ''[[VillainousUnderdog Clayman]]'' who does so after spending most of the previous and this episode getting [[HumiliationConga utterly humiliated both in the physical and mental sense]] as he finally achieves his Awakening, putting almost everyone at Walpurgis on edge...[[SubvertedTrope except Rimuru]], for whom this was AllAccordingToPlan as the two prepare to face off.]]
55-->'''[[spoiler:Clayman]]''': The heavens haven't forsaken me yet!
56* BackFromTheDead: Resurrection magic does exist, but it's a complicated art. The long and short of it is that no matter what it needs to be done as soon as possible because the soul starts to vanish and/or degrade upon death in most cases. If one doesn't do so, best case scenario is that it just fails. The worst case scenario is when [[CameBackWrong you get something]] like what happened with Milim and the [[MonsterFromBeyondTheVeil Chaos Dragon]].
57** Normally, the holy spell/art Resurrection is one of the most powerful and difficult magics to master, and it needs to be cast as soon as possible on the deceased in order to preserve their soul. It also won't work if the soul is no longer present.
58** Ruminas Valentine's [[spoiler:Unique Skill Lust and later Ultimate Skill Lustful King Asmodeus has resurrection as part of the package. It's much easier to revive even multiple people from the dead, but again the souls must be present which means timing is key.]]
59** [[spoiler:The victims of Tempest who were slaughtered by the Kingdom of Farmus had their souls contained by the barriers around the city as a side-effect with Shuna and Myulan working to keep them in after they were dropped, meaning Rimuru had time to properly revive them before it was too late. He had to become a Demon Lord to even be strong and skilled enough with magicule control in order to properly revive everyone in the first place.]]
60** This goes up to DeathIsCheap levels within the Tempest Labyrinth. As long as you're wearing the Resurrection Bracelets crafted specifically for the dungeon by Ramiris, it doesn't matter how brutally you die in there since your soul will be preserved and your body will be brought back even free of all fatal injuries.
61** During the war with the Empire, [[spoiler:Rimuru harvests the souls of the nearly ''million'' fallen enemy soldiers and revives 700,000 of them while having enough spiritual energy left over equivalent to a million harvested human souls. This is because many of the Empire's soldiers were artificially augumented to have souls equal to dozens to hundreds or even ''thousands'' of normal human souls. Reviving them [[BroughtDownToNormal in a reduced state]] thus left so much spiritual energy behind for his own use.]]
62* BaitAndSwitch: Shizu is introduced as Rimuru's major love interest. Instead, [[spoiler:she becomes possessed and dies two episodes later, with her DyingRequest being that he assimilate her and fulfill her last missions. Doing the former allows Rimuru to take on human form once again]].
63* BalanceOfPower: Before [[SpannerInTheWorks Rimuru]] showed up, a rather complicated one exists throughout the world.
64** At its most basic level, there are three major powers: The humans, the [[MaouTheDemonKing Demon Lords]], and the angels. The former two are the Type A and B powers, while the angels are the Type E [[OmnicidalNeutral who are out to kill anyone who develops technology too high]]. Luckily, the angels don't otherwise interfere outside of their 500-year scheduled purges, but whenever they show up things tend to devolve into a chaotic free-for-all.
65** Humanity is technically split up among themselves in its ''own'' balance.
66*** With the [[TheEmpire Eastern Empire]] led by Emperor Rudra being the dominant force on their side, with the largest army, the most advanced human military technology, and the largest collection of the strongest humans alive. He technically has a Type E power in the form of [[DragonsAreDivine True Dragon]] Velgrynd (who's probably as dangerous as almost the entire military put together), and he seeks to force the rest of humanity under the Empire's banner in order to destroy the Demon Lords and especially [[DemonLordsAndArchDevils Guy Crimson]], the strongest Demon Lord. Only geographical location, difficult logistics for a mass invasion, and the presence of ''other'' Demon Lords between the territories have prevented them from assimilating the western human nations under their banner.
67*** The Council of the West is made up of TheFederation of most of the western human nations. They have a Type C relationship with the Dwarven Kingdom of Dwargo, the Sorcerous Dynasty of Sarion, and the Holy Empire of Ruberios, who are all nominally aligned with the Council against the threat of monsters, Demon Lords, and the Empire, but all individually are of such independent self-sufficient strength they could ignore and go it alone if they wanted to. [[spoiler:Plus, it's only known to few that the Holy Empire's "God" Luminous is actually the True Demon Lord Ruminas Valentine and its emperor is in fact one of her most powerful vampire servants, but their interests align in keeping humanity safe.]]
68** The Demon Lords are technically a loose alliance who go about their own business and have various stronger alliances between each other and some of them even have relations with the human kingdoms. Guy can be considered "leader" [[AsskickingLeadsToLeadership by virtue of being one of the strongest who can push around almost any of the others]] and come down on serious in-fighting, and he has his own True Dragon Type E power in the form of Velzard on his side while outright calling the other Demon Lords his "pawns" in his long game against Rudra. The only major rival he has in this regard is Milim Nava, and she barely has any interest in "ruling" and just does what she wants. This of course doesn't stop the others from scheming together to gain more power and possibly knocking off some of their fellows, [[spoiler:such as Clayman wanting to ultimately off Leon Cromwell as revenge for his master Kazaream]].
69** This balance then pretty much ''breaks'' once Rimuru comes on the scene and befriends True Dragon Veldora. His actions result in Veldora's disappearance from the Jura Forest (originally a free zone under his [[SealedEvilInACan sealed]] protection smack dab between the Empire and the Council along with near several Demon Lord territories) and multiple factions trying to take it over. Rimuru ends up gaining power and followers before being declared administrator of the Forest by the dyrads for defeating a prospective Demon Lord; starts introducing massive cultural and technological reforms that turn his nation of Tempest into a powerhouse; [[spoiler:eventually ''becomes'' a Demon Lord after crippling the human Kingdom of Falmuth's military and killing the manipulator Clayman, resulting in a full shift in the Demon Lords ranks; earns the respect and alliance of the Holy Empire, Council, Dwargo, Sarion, and Milim Nava; and amasses a large army of incredibly powerful monsters, including Veldora, the legendary Sword Saint and four of the Seven Primordial Demons (the other three being Guy and two of his strongest servants).]] By this point, Guy outright calls Rimuru a disruption of the balance between himself and Rudra. [[spoiler:And then Rimuru actually ''fights'' the Empire and ''wins''.]]
70* BeastMan: Several species and varying degrees of anthropomorphism from this to LittleBitBeastly.
71* BeCarefulWhatYouWishFor:
72** The world takes into account the target of the reincarnation's wishes before sending them along. [[ForegoneConclusion Rimuru's casual and unknowing responses turn him into a slime.]]
73** Gelmud wants Geld to eat enough monsters [[spoiler: so he can evolve into a Demon Lord]]. Geld proceeds to follow his orders exactly, [[spoiler: starting by killing and eating his benefactor. This kickstarts his evolution, just like he wanted]].
74** Twicefold for Shogou. He tried to goad Geld II into droping his arms (hoping for an advantage), only for Geld to not fall for his provocations. Later, as he's losing, he kills an ally in order to gain the skill [Survivor], which gives him regeneration and improved defenses, and claims that with it he's now invincible. This pisses off Geld enough that he decides to drop his weapons to deal out a NoHoldsBarredBeatdown. Thus, he learns the hard way that his improved defenses don't give him [[FeelNoPain Pain Nullification]] and his regeneration only prolongs his suffering.
75* BishounenLine: How power levels are gauged. When a monster is named, it becomes closer to looking human, while keeping previous traits. This means Rimuru, Treyni, Demon Pillars and other extremely powerful monsters appear as beautiful humans. Veldora subverts this, still looking like a dragon despite how powerful he is [[spoiler:and when he actually gains a human form, it's more for convenience than an actual power boost.]]
76* BloodlessCarnage: Not normally, but it is actually more terrifying when there is no blood involved [[spoiler:as the soldiers of Falmuth can no longer attest to]].
77* BlandNameProduct: Before Rimuru dies at the start of the series, he tells his friend to destroy his hard drive. In an anime only end of episode gag we actually get to see him do this, and Rimuru's computer runs on "[[https://en.wikipedia.org/wiki/Microsoft_Windows Mechasoft Doors]]".
78* BookEnds: Episode 37 (the first episode of Season 2 Part 2) starts with Laplace running away from the Holy Church of Luminous at night after trying to sneak inside and being attacked and seemingly killed by Roy Valentine, only to mysteriously appear fine afterwards. Episode 48 (the last episode of Season 2) ends with Laplace once again running into Roy while trying to escape the Holy Church at night after failing to infiltrate, [[spoiler:but this time he fights Roy and utterly dominates him before revealing he mysteriously managed to yank out Roy's heart during the beatdown right before finishing him off.]]
79* BreatherEpisode: ''The Slime Diaries'', a lighthearted {{Yonkoma}} spinoff, aired its anime adaptation in the middle of the second season, right after [[spoiler:the Famulth Kingdom's attempted invasion and Rimuru's subsequent awakening into a True Demon Lord]] and right before [[spoiler:the Walpurgis Banquet where Rimuru and Clayman finally clash.]]
80* BringMyBrownPants: Outside the Dwarven kingdom, when Rimuru scares a party of human adventurers off, he is informed that a portion of witnesses soiled themselves in the process.
81* CallBack: The first OP for Season 3 has a section that harkens all the way back to the first OP for Season 1, specifically with another clash between Rimuru and Hinata under a cloudy sky in the ruins of a town. But while the Season 1 OP has Rimuru in his pre-Demon Lord attire and Hinata in her regular armaments, the Season 3 OP has Rimuru in his Demon Lord outfit and Hinata switching into her Holy Armaments to signify this time they're both fighting at their peaks.
82* CannotTellALie: Monsters are incapable of lying directly. If they lie, they'll disappear immediately. Lesser ones that are capable of normal sexual reproduction aren't held to this, however. However, when humans get too complacent about trusting monsters they tend to get tricked and screwed over badly: They're still capable of lies by omission or misleading truths. After awhile this idea is seemingly scrapped with the acknowledgement that monsters with a primarily spiritual body can ''also'' lie consequence free. So who exactly is bound by this rule?
83* {{Cap}}: Once a demon evolves into an Arch-Demon, their magicule count won't grow any higher past a certain point. At that point, it is cunning, experience, and mastery of magic and Skills that determines their place in demon society. [[spoiler:The only way to break this cap is to evolve into a Demon Peer, which under most circumstances requires being named and having managed to remain at that peak of power for a few millennia without dying and resurrecting.]]
84* CardboardPrison: When briefly put in prison for (accidentally) causing a very large public disturbance outside the Dwarf city, Rimuru is put inside a barrel as well as a cell. As slimes in this universe are typically seen as one of the weaker beings and might be able to contain them, Rimuru is no ordinary slime. He gets out of it (and the cell) as soon as he wants to.
85* CharacterizationMarchesOn
86** In the web novel, Hinata Sakaguchi is introduced as a high-functioning sociopath who had already murdered her father to collect on his insurance money (though he probably deserved it considering he was a wife-beater and gambling addict who put the family in debt in the first place) and was considering murdering her mother soon for being a burden. When attacked after being summoned, she brutally murdered her assailants, though once again they weren't exactly sympathetic characters. However, by the time she comes into conflict with Rimuru, she's instead characterized as a slightly odd girl who is only trying her best to save people from dangerous monsters and has a habit of letting herself get led astray by her emotions. In subsequent adaptations, it's slightly altered so that her sociopathy is missing (though it still treats her killing her father and her three assailants as justified or at least understandable given circumstances) and her thoughts about killing her mother were brought from her descending into madness and a cult, with her personality pretty much consistent up to when she encounters Rimuru.
87** In the web novel, when Leon Cromwell has his first fight, it's made clear that when cutting loose he doesn't really care if his own men get caught in the crossfire. They understand this and don't begrudge him at all. However, much later on suddenly he can't go all out for fear of getting his men hurt. This doesn't appear at all in the light novel, as the first fight has Leon ordering his men to not interfere with his fight and instead assist the allied forces, holding back his full power since he's worried about catching the people he cares about in the destruction, and latter on Leon has no issue fighting alongside his subordinates while still holding back to avoid destroying his own palace and hurting his men.
88* CivilizationDestroyer: The higher-level True Demon Lords, Primordial Demons and the True Dragons are all capable of this, with it being on record they destroyed plenty of countries and cultures in the past. The angels meanwhile carry out systematic purges of civilizations they deem as too advanced from their preferred MedievalStasis. The only reason most don't get around to destroying the whole planet is either because they like the planet itself or they're stopped by the ones that don't want the planet to become a smoking crater.
89* {{Cliffhanger}}: Episode 56 of the anime (or more specifically Episode 8 of Season 3) ends with [[spoiler:the surrendering Hinata TakingTheBullet for Rimuru by pushing the exhausted slime out of the way of the energy blast from the exploding boobytrapped Drago Buster sword, with the final shot of the episode showing her [[TorsoWithAView getting a hole blasted clean through her chest]] by the energy complete with blood splatter.]]
90* ColorCodedForYourConvenience: In addition to the Primordial Demons themselves, the color of a demonic lineage is commonly used to determine how well things would likely work out when trying to summon one. Red and Yellow demons are Unnegotiable, more likely to trick or kill the summoner. White, Green and Blue demons are Negotiable, the most likely to keep the contract and least likely to screw over their summoner. Black and Purple demons are Whimsical; eccentric, reckless and unpredictable. Sometimes screwing over their summoner, sometimes serving loyally (or fanatically in some cases) and sometimes even giving up the price that they were promised simply because they liked their clients.
91* CompleteImmortality: When killed, demons eventually revive in the underworld. Presumably the same for other spirits. However, if their souls are devoured by another demon or someone like Rimuru, they're DeaderThanDead.
92* CoversAlwaysLie: Some posters show Rimuru, in human form, alongside Shizu. [[spoiler:Shizu later dies, and Rimuru doesn't get a human form until he absorbs her following her death.]]
93* CrimeOfSelfDefense: The nation that declares war on the city of Tempest? They do so after some of their knights go to investigate a disturbance and see the monsters being struck down by three criminals. Said knights arrogantly announce a one week time frame before launching hostilities... As if Rimuru wasn't ''already'' pissed off at that point by seeing a bunch of '''children''' among the victims.
94* CrouchingMoronHiddenBadass:
95** Gobta at first glance looks like an idiotic fool who slacks off whenever he can and runs at the first sign of trouble. While he ''is'' all that to an extent, he's also the leader of the Goblin Riders of Tempest, an accomplished warrior trained by [[MasterSwordsman Hakurou]], [[spoiler:eventual general in Tempest's military, and capable of performing a FusionDance with [[NobleWolf Ranga]] to become a ''True Demon Lord''-level fighter who can tear tank armor like tissue paper and shrug off tank rounds powerful enough to kill a dragon like a breeze.]]
96** Gabiru comes off as a loud-mouth braggart who ends up the butt of jokes due to his own foolishness catching up to him, and while he ''is'' he's also the leader of one of Tempest's strongest forces, a master of aerial combat, a brilliant scientific researcher, [[spoiler:and becomes a True Demon Lord.]]
97** Ellen, Cabal, and Gido are a trio of bumbling human adventurers who tend to bite off more than can chew with the only thing really going for them being their luck (and being friends with Rimuru). They become more competent after receiving some nifty gear from Rimuru, but still bumble a bit. [[spoiler:In reality, they're all elves [[HideYourOtherness disguising themselves as humans]] from the Sorceror's Dynasty of Sarion, with Ellen/Elyune being the [[ReallyRoyaltyReveal cousin to the "Heavenly Emperor"]] while Cabal and Gido are actually high-ranking elven warriors assigned as her bodyguards. The reason they appear as "bumbling" is because they seal a good portion of their true strength to hide themselves from possible detection, and they only release it if they're in [[GodzillaThreshold real danger they can't run or talk their way out of]].]]
98** [[spoiler:Bernie and Jiwu are originally introduced as Otherworlders of decent skill that ended up partnering up with Masayuki, hyping the guy up with HeroWorship and coming off as oblivious YesMen to his discomfort. In reality, they're both ''Single Digits'' of the Eastern Empire's [[PraetorianGuard Imperial]] [[SuperSoldier Guard]], actually sent to spy on Masayuki and possibly assassinate Rimuru Tempest. Bernie is skilled enough to go toe-to-toe with Benimaru, while Jiwu massacres a whole group of [[DaywalkingVampire Overcomers]] (each a Calamity-class monster) and is able to keep pace with [[WorldsBestWarrior Chloe/Chronoa]]. They also reveal they were playing up the sycophant ways.]]
99* CuteMonsterGirl: Humanoid monster races named by Rimuru tend to become much more human looking, though not always. The small, dopey goblins turn into buff goblin men and cute goblin girls, for the most part, while the ogres shrink in size and become less wild looking. It doesn't always happen, but even several lizardwomen take or can assume a basically human form, depending on whether you're reading the web novel or the light novel/manga.
100* CurbStompBattle: A ''very'' common occurance for Rimuru and his citizens. It would be easier to list the fights that don't fall under this trope.
101* CurbStompCushion: The battle in the Labyrinth between Tempest and the Eastern Empire's Armored Remodeled Division of the Armored Corps ends decisively in Tempest's favor, but that's not to say the Empire was completely outmatched. In fact, they managed to defeat 7 of the Ten Labyrinth Lords, with the most impressive feats being how 100 of the division's elites managed to beat Adalman, Albert, the Death Dragon, and their ''tens of thousands'' undead soldiers (much of it swelled with fallen Empire soldiers) at the cost of all but the strongest three, and how Major General Minute managed to kill Apito after a hard-fought one-on-one.
102[[/folder]]
103
104[[folder:Tropes D-F]]
105* DarkIsNotEvil:
106** According to Rimuru, demons aren't actually evil even though they're basically darkness spirits. In practice, however, they tend to be sadistic monsters. They ''are'' genuinely loyal to summoners that they respect, however.
107** Most of the monster races are shown to not be so different from the other races and can come off as friendly. At one point the idea is floated of reclassifying them as demihumans instead but the idea is dropped. It still implies that (humanoid) monster and demihuman are interchangeable but one is basically just a slur.
108* DeconstructedTrope: {{Telepathy}} is a very useful tool for communication and understanding, especially if you come from a whole race that possesses it. Unfortunately, this also makes it difficult to properly communicate with someone with whom you can't just instantly share your thoughts with. [[spoiler:Geld bemoans while trying to properly organize and work with the majin prisoners of Clayman's forces that he's been spoiled with how easy commanding his High Orcs are by comparison, as he has to take the time to explain aloud what they're doing wrong.]] In addition, because many monster races have [Thought Communication] even if only between their own kinds, this also means few wild tribes bother putting their histories or stories down in writing, or even learning a written language.
109* DefeatMeansFriendship: Most of Rimuru's (incidental) way of gaining allies follows the same pattern: Some people pick a fight with Rimuru; Rimuru shows his skill and, if possible, talks to them; Rimuru gains allies. Subverted with the Goblin Tribe because they know fighting is futile, thus surrender as soon as they meet Rimuru and Veldora who can't fight at all but is a very reasonable guy. Utterly averted with the demons he summons, which have all been loyal (if eccentric) Black Demons.
110* DemonicPossession: Demon summoning requires the demon be provided a physical body that requires some form of this, though there are many variants on this. Of course, demons and even spirits in general (though they prefer a more symbiotic relationship over demons) aren't the only race that can pull this off:
111** Have a already-prepared vessel on hand. This can be accomplished with a {{Golem}} (as with Berreta) or a [[ArtificialHuman homunculus body]] that has no prior occupant for the demon's soul to settle into and bind to (such as the majority of the Black Numbers).
112** Use a HumanSacrifice. This can involve flat-out providing dead corpses to be sacrificed and broken down into raw material for the demon to construct a body with (as Diablo and his two Greater Demons used the 20,000 or so dead Falmuth soldiers' bodies provided by Rimuru) or a living being choosing to be a WillingChanneler or being RaisedAsAHost (as was the case with Testarossa before she came under Tempest's employ).
113* DemonLordsAndArchdevils
114** Demon lords are individuals from any race that consumed human souls to trigger an evolution into a special almost godlike being. They aren't necessarily demons and, in fact, only one of the ten at the start of the story actually is one.
115** Actual demons are ranked from lesser to greater to arch to peers. Lesser demons are reasonably strong, but both they and greaters are basically fodder. Archdemons are rare, powerful monsters and demon peers are nearly unheard of. The latter are at the same level as demon lords.
116* DisabilityImmunity: Humans as a race don't usually have access to internal [[{{Mana}} magicule]] stores like the other races of the world, but this does provide them several advantages that monsters don't. Most significantly, humans are all but immune to the most devastating attacks that directly attack someone's magicule supply (which is partly why Holy Magic, which doesn't rely on magicules but rather [[ClapYourHandsIfYouBelieve faith]], has gained its reputation as an "evil-slaying" force), and this allows them [[ExplosiveBreeder to have as many children as they want]] without fear of losing strength unlike monsters who give up some of their magicules to their children. [[ArsonMurderAndJaywalking This also means they can be freely named without consequences]] compared to how monsters treat getting names as important life-changing events.
117* DoItYourselfThemeTune:
118** The second Ending theme of the first season, "Little Soldier", is performed by Creator/AzusaTadokoro, who is the Japanese voice actress of Chloe Aubert.
119** An odd example in that the first and second Opening themes of the first season ("Nameless story" and "Meguru Mono"), as well as second Ending theme of the second season ("Reincarnate") are performed by Creator/TakumaTerashima, who is the Japanese voice of Satoru Mikami, Rimuru's past self long after his speaking role in the series is over.
120* DontTryThisAtHome:
121** A disclaimer reading "Never attempt this" pops up as we see Temura dump his computer (plugged in, no less) into the bathtub, as Rimuru told him to do before dying.
122** In the ''Slime Dairies'', upon seeing the first snowfall of the winter season, Rimuru dives out the second-story window to land in the snow. Great Sage promptly states that jumping from such a height is dangerous "for those without the relevant skills".
123* EarlyBirdCameo:
124** Before Shizue is officially introduced in the episode named after her ''Shizu'', she first appeared during the beginning of the pilot episode, where she was sucked into a fire and died... only to be brought into the fantasy world and featured five episodes later.
125** Hinata is noticeable example as she first appears in the very first opening locked in an epic clash with Rimuru...but she isn't mentioned at all until Episode 8 and doesn't make a physical appearance until Episode ''23'', near the very end of the season and long after the OP has changed, where she still goes directly unnamed. It wouldn't be until the second season that she and Rimuru finally have their proper introduction and first fight
126* EasilyForgiven:
127** Rimuru has a policy of forgiving people who have disrespected, attacked, or even tried to kill him and putting them to work building up his settlement, though it helps the majority of them (like Vesta and Gabiru) were genuinely regretful for their actions and willing to swallow their pride and degrade themselves to get his forgiveness. Even the orcs, who until their master was defeated by Rimuru were slaughtering and devouring anything in their path to sate their hunger, are shown leniency that surprises everyone, including them. In the case of the orcs, Rimuru even lampshades this before explaining his reasoning; if they continue to fight or take revenge, everyone loses. It's better for the orcs to make up for their actions by deed instead of with their blood.
128** This is subverted, however, against those he deems aren't truly sorry and would simply use his leniency to [[KarmaHoudini escape punishment]] at best or [[TheFarmerAndTheViper flat-out try and take harmful advantage of him and his people]] at worst. ''These'' ones get a serious beating at bare minimum, followed up by a warning if they're lucky, a quick death if he decides they're too dangerous, or suffer a FateWorseThanDeath via assimilation and [[DeaderThanDead having their very souls torn apart]] if he's really mad.
129** He needed the King of Falmuth [[spoiler: alive for his future plans but it takes a great deal of escalating restraint on his part when the King starts off simultaneously begging for mercy and rebuking Rimuru for talking down to him, then proceeds to ceaselessly spitout a nonstop diatrab of obvious lies, blame-shifting and ridiculous nonsensical excuses after Rimuru unleashes a deadly energy aura in response. When the king starts trying to negotiate for post-war reparations of lost troups after being assured he wont be killed, Rimuru finally loses his patience and blows off his arm to get him to finally shut the hell up.]]
130* {{Egopolis}}: {{Defied|Trope}} by Rimuru, who objects to the capital city of the Jura Forest Alliance being called 'Rimuru', but played straight when everyone calls it that anyway.
131* EthnicityMonarch:
132** Benimaru and his sister Shuna are the prince and princess of the oni (later Kijin) race.
133** Gabiru and his family are the rulers of the lizardfolk (later Dragonnewt) race.
134** Geld is the name held by two different leaders of the Orc (later High Orc) race.
135* EvenEvilHasLovedOnes: Light novel volume seven opens with [[spoiler: Clayman's]] friends and allies mourning his death. Their grief is deep and genuine, exacerbated by the fact that they cannot prosecute vengeance on his killer due to a lack of manpower and resources.
136* EverythingIs3DPrintedInTheFuture: Rimuru is a living take on this trope, as he has [[MinMaxing a synergistic combination of skills]] that allows him to dissolve and analyze any object he eats and make exact copies from stored materials. He can also refine what he consumes into directly usable and highly potent resources.
137* EvilDetectingDog: Played for tragedy in Shizu's backstory. Her friend adopted a stray animal and tried to keep it as a familiar but it started growling at Leon so Ifrit burned it and Shizu's friend to ashes.
138* EvolutionaryLevels: Every species has higher forms they can evolve into. Mostly the change is linear but there can be variants sometimes.
139** Goblins evolve into Hobgoblins (for the males) and Goblinas (for the females).
140** Humans after overcoming several odds can evolve into Sages, who in turn evolve into Saints.
141** Rimuru himself evolves after some time into a Demon Slime when [[spoiler: awakening into a True Demon Lord]] and later he becomes [[spoiler: an Ultimate Slime, reaching the pinnacle of his species]].
142** Ogres can evolve into Oni if they attain enough power and can further evolve into Fair Onis or Evil Onis.
143* EvolutionPowerUp: All lifeforms in the world are able to do this, acquiring more power the more they evolve.
144* ExactWords:
145** Gelmud tells Geld [[spoiler: to evolve into a Demon Lord already. Geld fulfills his request by killing and eating him, prompting his evolution]].
146** When the elf does her fortune telling for Rimuru, she shows him Shizue as "the one destined to be with you". [[spoiler:She literally gets eaten by Rimuru, offering him his humanoid form.]]
147** Hinata was told that Rimuru was [[spoiler:the one responsible for Shizue's death]] and thus goes after him in order to avenge this crime. Rimuru admits that it's technically true [[spoiler: since he both removed the spirit Ifrit which was keeping her alive and devoured her body per her dying wishes]], but is not given time to explain or elaborate before Hinata attacks. Even when he tells her there were extenuating circumstances, she retorts that she doesn't care and that only the end result matters.
148* ExplainExplainOhCrap:
149** When Gabiru arrives in the village, he tries to convince Rimuru that the goblin village should become his subordinates because they are so weak. However as he is explaining this he starts to notice that his audience is a hobgoblin, a slime and a group of evolved ogres, and not a ''weakling goblin'' in sight.
150** When going over the information about the Orc Army, they start to wonder how an army of thousands of Orcs are able to stay supplied. They then realize that every area they go through there isn't a single body found be it Orc or other monster. It is then they realize that the Orc army is eating the bodies of anyone slain in battle.
151** If anyone who has some knowledge about demons end up fighting [[TheDreaded Diablo]], you can expect their InnerMonologue to end up like this. It really doesn't help that Diablo likes toying with his enemies as they go through a slow realization.
152* ExtremelyShortTimespan: While most of the story arcs take place over a few days, weeks, or even months, the arc where Rimuru and co. finish things up with Clayman, including the decimation of his army, conquering of his castle, and face-off between Rimuru and Clayman, all happen over the course of a very eventful but relatively small number of hours.
153* TheFederation: Rimuru was initially the central figurehead of TheAlliance between the various monster races of the Jura Forest, but after the defeat of the orcs, the proper foundation of Tempest, and his True Demon Lord ascension/recognition, the nation eventually turned into this as his rule was solidified over the forest and the races pledged their loyalty to him.
154* FictionalUnitedNations: The Council of the West is basically a medieval version of the UN, albeit with more actual authority and power. It's made up of many western human nations that originally banded together as a cooperative force against monsters, but eventually grew into a political force meant to counter the growing power of the [[TheEmpire Eastern Empire]] and provide the western nations a bulwark against the Demon Lords while having power over its members' international affairs and meditating over internal conflicts. It doesn't technically have a standing army of its own (though it can call upon the militaries of its member nations in times of crisis), but rather relies on the mutual cooperation of the AdventureGuild, which they are the main funder of in exchange for being able to call upon its members as a police force (in fact, both the Council's and the Free Guild's headquarters are located in Ingracia just to drive this home). This funding in turn comes from the contributions provided by the member nations, which varies depending on how many councilors said nation provides to represent their interests (in other words, the more you're willing to pay, the greater your voice in international matters). This bloc does ''not'' include Dwargon, Sarion, or Ruberios, as all have sufficient military and economic strength to act independently of the Council, but they maintain cordial relations if nothing else. Joining the Council is a marked interest of Rimuru, as doing so would open plenty of doors to the international trade with humans he craves [[spoiler:and thus it's a major goal of the Rosso family to prevent him from doing so (or at least, only on their terms), as they recognize that Tempest's prosperity would easily lead to it gaining disproportionate power on the human nations that would threaten their own power.]]
155* ForegoneConclusion: Several of Rimuru's ''fights'' were certain to end in his victory before they began, and others were over when he made a certain move:
156** His fight with Ifrit was already won thanks to his [[ImmuneToFire Thermal Resistance]] skill, meaning Ifrit could not do damage to him.
157** The Orc Disaster Geld was finished the moment Rimuru grappeled with him in slime form. The manga even has Veldora comment on it, realizing that in a battle of consumption, none could match Rimuru's feat of devouring both him ''and'' the seal holding him at once.
158* FormulaWithATwist: It's ExactlyWhatItSaysOnTheTin: the protagonist is reincarnated as a small slime--albeit with a ''very'' powerful [[CannibalismSuperpower ability to copy the powers and properties of any person or thing it devours]] (as well as an unseen "[[ArtificialIntelligence Sage]]" that provides other useful powers and information).
159* AFormYouAreComfortableWith: Rimuru often takes human form when talking with humanoids so that they can more easily conduct conversation. In some cases this backfires, with visitors seeing him as a mere slime trying to imitate a person.
160* FromNobodyToNightmare: Two nations on a geopolitical stage.
161** Tempest started out as a village of goblins and by the end of the Eastern Empire War was a superpower that utterly wrecked all existing BalanceOfPower calculations. Its economy had enough capital to buy and sell nations, it was a technological powerhouse touting innovations unseen in the rest of the world and politically it was allied with the [[LongList Holy Empire of Ruberios, Milim's Territory, Farminus, Blumund, the Sorcerous Dynasty of Sarion, the Armed Nation of Dwargon]] all the while enjoying massive influence in the [[FictionalUnitedNations Council of the West]]. Militarily they were untouchable. In a world where [[OneManArmy a singular powerful combatant]] can devastate entire armies, Tempest is home to [[PersonOfMassDestruction three members of the Octogram, the vacation home of another, one True Dragon and no less than twelve other True Demon Lord class combatants]]. Its armies are comprised of [[EliteMook powerful monsters]] including nearly [[BadassArmy a thousand high ranking demons]]. The Eastern Empire learned the hard way why it is a bad idea to mess with Tempest.
162** To a lesser extent [[ExactlyWhatItSaysOnTheTin Milim's Territory]]. It mainly relied on having [[PersonOfMassDestruction Milim Nava]] as its nominal monarch for defense with only her priests, the Dragon Faithful, functioning as a combination of government, military and police force. With [[spoiler: Carrion and Frey]] joining Milim's forces and the annexation of [[spoiler: Clayman's holdings]], not only does her Territory now encompass the realms of [[spoiler: four]] demon lords, it has absorbed massive wealth, a vast army and very able administrators from its component countries. With subordinate monarchs under her command, Milim could make a very good case for being an Empress. Where there was once disparate territories, barely administered in Milim's case, there is now a new nation with massive resources that forms a bulwark against the Eastern Empire.
163[[/folder]]
164
165[[folder:Tropes G-O]]
166* GenericDoomsdayVillain: [[spoiler:Kagurazaka Yuuki]] in the web novel doesn't really have any kind of decent motivation. He just wants to destroy the world because he wants to destroy the world. There's a vague acknowledgement that he maybe had a tough childhood or something but even the characters don't believe that this makes any kind of real sense. There's actually some setup for him being more than this during the middle part of the story, but in the end it's all scrapped and he's just all "MWUAHAHA I will burn everything!" In later adaptations he settles for the more mundane TakeOverTheWorld [[spoiler:with a side of WellIntentionedExtremist.]]
167* GlobalCurrency: An issue with this forms the backbone of a major subplot for the [[FestivalEpisode Tempest Founding Festival arc]] in Volume 9. While the world uses plenty of varying types of currency (from bartering goods directly, [=IOUs=], copper and silver coins, or even coins technically out of circulation), the modern accepted "common currency" for trading are gold coins minted in Dwargon. Treasure and gold coins from ancient kingdoms which are no longer considered in circulation have to be accepted and converted to Dwargon coins. Tempest finds itself in the awkward position of running out of Dwargon gold coins to pay all the merchants who took part in the festival, but curiously enough many of these merchants who are licensed tradesmen with nations from the [[FictionalUnitedNations Council of the West]] are ''insisting'' that they will only accept payment in said gold coins and won't accept other alternate payment methods, not even to convert themselves, and they technically have the right to such a demand per international laws. Tempest was originally planning to finance most of the festival costs on all the treasure they took from [[spoiler:Demon Lord Clayman's territory]] as spoils of war, hence why this originally wasn't a concern, but now they don't have the funds in the acceptable currency. It quickly becomes apparent to Tempest's top brass that this is a concentrated engineered scenario by someone [[spoiler:(read, the Five Elders)]] to try and ruin their reputation on the economic front. Rimuru manages to get the extra coinage he needs thanks to being a close ally to Dwargon's King Gazel and an assist from Sarion's Queen Elumeshia, who remarks that it's very likely that someone directly in on the conspiracy would have made AnOfferYouCantRefuse at the eleventh hour to provide the necessary coinage and thus make Tempest owe them a "favor" in the future, which comes true when [[spoiler:the Elders' pawn Duke Meuse]] tries to make such an offer before Rimuru [[DidntSeeThatComing brings the money in]].
168* GodEating: [[TheHero Rimuru]] practically starts out doing this by absorbing the [[SealedBadassInACan sealed]] [[DragonsAreDivine Veldora Tempest]] via [Predator], though this was a willing act on both parties' ends as doing so would allow him and Veldora to analyze the [[SpaceMaster Unlimited Imprisonment]] at their leisure and eventually free Veldora. [[spoiler:In a much more serious manner, Rimuru ends up having to do this again on a BrainwashedAndCrazy Veldora during the war with the Eastern Empire to put him in a position to free him from the brainwashing. This time, the act of breaking down Veldora's potent magicules directly actually causes Rimuru (who has grown ''much'' stronger since then) physical and spiritual pain, but this also ends up in Rimuru properly assimilating Veldora's magicules and [[DeityOfHumanOrigin becoming]] a True Dragon/[[UltimateLifeForm Ultimate Slime]] himself. And then for good measure, Rimuru does the same thing to Veldora's {{brainwashed}} and [[BigSisterInstinct pissed-off sister]] Velgrynd to free her of the former and calm her down by showing her brother's okay.]]
169* HaremGenre: {{Play|ingWithATrope}}ed with, as while Rimuru identifies as male, admits that he would want to finally give up his "virgin" status, is very much an admirer of the womanly form, and there's no shortage of interested females, [[NoBiologicalSex his "little brother" no longer exists]]. Though he does admit even that with his shape changing ability, that is [[CelibateHero entirely by choice]]. Doesn't stop an entire UnwantedHarem from being formed, and seem content just ''being'' with him.
170* HolyBurnsEvil: Played with by [[HolyHandGrenade Holy Magic]], which at first glance fits this trope due to being far more effective on monsters than it is on humans and thus gains the reputation as a "purifying" force that destroys "evil" monsters. In reality, Holy Magic works by using "[[ClapYourHandsIfYouBelieve faith]]" to power magic that manipulates holy energy, purifies [[{{Mana}} magicules]], and at high levels manipulates "spiritrons", the very building blocks of magical energy. As most humans have little to no magicules at all while often times most monsters don't just rely on magicules to survive but [[MadeOfMagic they're partially made from them]], this makes all but the most powerful Holy Magic spells devastating to monsters while mostly harmless to humans. This is why many beings tend to react in shock if they see a monster casting Holy Magic, as even if they know it's ''technically'' possible, without fine-tune control and/or a Skill that provides resistance against Holy Magic's effects it's basically the equivalent of throwing around radioactive material and praying they don't kill themselves in the process.
171* HolyHandGrenade: Holy magic in this story follows a similar path of ReligionIsMagic, where fervous belief in a higher power allows one to cast powerful attacks that bypass AntiMagic and are capable of [[DeaderThanDead even killing the soul]], though in this case it's closer to ClapYourHandsIfYouBelieve in execution, as the idol of worship does not need to be divine themselves, the caster simply needs to have absolute faith in the chosen person in order to power their holy abilities.
172* HonourBeforeReason: Benimaru in his first appearance where he fights against Rimuru even after he realizes the gap between their respective abilities. At this point, he's one of six ogres still alive after the orcs slaughtered his village as well as their acting leader and should be prioritizing the safety of his followers over recklessly endangering them fighting a foe he assumes is responsible for leading the orcs, especially after said foe incapacitated three of them without using anywhere near his full strength. Luckily, Rimuru's an understanding chap.
173* HumansAdvanceSwiftly: Most monsters have telepathy, so they don't use maps or writing, resulting in them not being able to pass much knowledge onto their children if they don't have time. Humans also understand their physical and magical weaknesses compared to monsters and thus are firm believers of unity to stand against them, resulting in humans being far more likely to forge alliances with each other or even neutral monster nations than their monster counterparts.
174* HumansAreAverage: Most humans appear to be "normal" humans, without natural access to magic or even natural internal [[{{Mana}} magicule]] supplies, though it's possible to develop such aptitude. On the whole, humans are physically and magically weaker than monsters, but they have the potential to far outnumber them and they've leveraged their technology and knowledge to develop countermeasures.
175* HumanJungleGym: The spin-off work ''The Slime Diaries'' has Rimuru visiting Geld II, the orc in charge of Tempest's construction efforts, and finding at least seven tiny goblin children climbing all over him, since they like to play with him when he takes breaks from his work. It is ridiculously adorable.
176* HumanResources: The Summons, who are yanked from other worlds by many nations and powers of this world more-or-less on an industrial basis for the slim chance of producing a Hero-level warrior that might be used against monsters or rival powers. Note that the Summons who fail to develop into heroes [[YourDaysAreNumbered usually die within several years]] as their bodies [[PhlebotinumOverdose cannot stand the enormous level of mana]] acquired in the process.
177* HumanSacrifice:[[spoiler: Rimuru needed to kill more 10,000 and devour their souls to evolve into a True Demon Lord. He did this by killing the invading army of Falmuth that numbered 20,000]].
178* HumbleHero: Rimuru wisely presents a humble front to everyone he meets, although he makes sure people understand he is a ruler of monsters. This gets him criticized by the Dwarven King, who warns him of the consequences of making himself too humble as king of a nation.
179* IDidWhatIHadToDo:
180** The Orc Lord admits he was aware that Gelmud was using him in an EvilPlan, but tells Rimuru he didn't have a choice. His people were dying from starvation, and he couldn't save them any other way.
181** Rimuru himself undergoes this [[spoiler:when he slaughters the invading Falmuth army, despite knowing some of them were simply JustFollowingOrders and MyCountryRightOrWrong. He doesn't take pleasure out of any of the killing, but it's the only way he'll gain the power necessary to evolve into a True Demon Lord and revive his fallen people (including Shion).]]
182* InfinityPlusOneSword: The aptly named Legend and Mythical/God-grade weaponry and [[InfinityPlusOneArmor armor]] are this, and fittingly are wielded by the strongest beings on the planet. The former is described as so overpowered that "owning one is akin to bringing a machinegun into swordfights", while the latter is equipment that only {{Physical God}}s could use to their full potential.
183* ImmortalProcreationClause: Monsters and humans that live longer than humans tend to have significantly lower fertility. Demon lords in particular turn out to be sterile. Several races like elves and oni reproduce very slowly not just because of biological limitations but also social ones, which keeps their populations barely at the level of sustainability. [[spoiler: Benimaru has to delay his evolution as it would have him reach the pinnacle of evolution possible for him, thus ‘ridding him of the need for procreation’, and as one of the last of the ogres he needs to have children. He only evolves after producing heirs with Momiji and Albis.]]
184* InsistentTerminology: Rimuru repeatedly states that his escapades with Milim, Veldora, and Ramiris into The Labyrinth and griefing parties with their [[RemoteBody monster forms]] are "research", not "games", and that there's plenty of importatnt things they're obtaining from this like fine-tuning the Labyrinth's difficulty through first-hand experience and [[BoxingLessonsForSuperman training themselves with limited skillsets]]. He gives up when even Raphael calls them "games" to his mental face.
185* InstantRunes: used for many spells, including barriers, flame pillars, disintegration, and teleportation.
186* InterspeciesRomance: Several humanoids develop crushes on other races, such as Soka having a thing for Souei or Garm being interested in Shuna and [[StupidSexyFlanders getting very confused around Rimuru.]]
187* KangarooCourt: Trials in the Armed Kingdom of Dwargon are essentially this, as the defendants are not allowed to speak in their own defense and must rely on a proxy to speak for them, which of course leaves the proxy open to being bought, as we see with the trial of Kaijin, Rimuru, and Kaijin's brothers. [[spoiler:The irony being the king ''knew'' this was a sham trial and used it to allow the defendants to leave the city without issue, while also lambasting Vesta for not manning up and admitting his own fault in private that leaves him thoroughly ashamed of himself.]]
188* TheLegionsOfHell: There are two noticeable examples. The first are the demon legions under Guy Crimson who are ostensibly one of the biggest threats to human civilization, but Guy isn't interested in outright eradication and instead uses them for "raids" to keep humans on their toes. The second are the Black Numbers who make up some of the strongest demons on the planet directly under Rimuru, which technically makes them [[DarkIsNotEvil the good (or at least neutral) guys]].
189* LetsYouAndHimFight: Both fights between Hinata and Rimuru come down to this in the end. In the first one, the ones behind it were hoping Hinata would kill Rimuru by feeding her MetaphoricallyTrue information that painted Rimuru in the worst possible light. In the second one, [[spoiler:they were hoping Rimuru would kill ''Hinata'' by forcing a situation where they would both believe the other side had come to do battle again rather than peace talks like they both really wanted, manipulating available information and making both sides assume the worst of each other.]]
190* LoadsAndLoadsOfRaces: More or less standard MedievalEuropeanFantasy set with some additions, which seems to be inspired by the ''Franchise/MonsterQuest''.
191* LoopholeAbuse: The Resurrection Bracelets are explicitly designed so that they only work while inside Ramiris' Dungeon, so taking them outside would be useless as they wouldn't grant resurrection (as Rimuru and staff warn adventurers who are challenging the Dungeon). However, there's nothing saying that you can't teleport to the Dungeon while wearing the bracelet to escape a fatal wound via the Dungeon's resurrection system, as [[spoiler: Gadra]] successfully finds out.
192* MagicSkirt: In the rare instances of skirt-wearing women doing active work, such as Ramiris, Suphia of the Beastketeers, and Milim in her alternate outfits/SuperMode [[{{Irony}} (despite her regular outfit shamelessly showing far more)]], their modesty is consistently protected.
193* MaleGaze: [[MsFanservice Milim Nava and Shion]] are both subjected to this due to Milim's [[{{Stripperific}} outfit]] and [[HartmanHips hips]] and Shion's [[BuxomBeautyStandard ample chest]].
194* MeaningfulRename: If a demon/monster is named by a strong individual, he/she gains some power from the name but it also means the giver has to give up part of their magical power (though luckily, magical power can regenerate with time). That's why monster parents don't name their kids.
195* MedievalStasis: Enforced by angels who descend every 500 years in massive armies that destroy any civilization that exceeds a certain level of development. Dwargo used to be the only survivor of such an assault before Tempest came along. As a result, technological progress usually has to be done in secret and selfishly hoarded by most nations researching it. [[TrappedInAnotherWorld Otherworlders]] that aren't being summoned as weapons of warfare [[GivingRadioToTheRomans have actually found use providing what technological knowledge they possess to their new nations.]] [[spoiler:The Eastern Empire, for example, has been using their Otherworlders' knowledge to produce working ''modern-day guns'' to better build up and supplement their military might in preparation for a war with the West.]]
196* MediumBlending: Rimuru's interface with the Great Sage is made up of CGI and live film of water and various objects.
197* MsFanservice: Both [[InnocentFanserviceGirl Milim Nava]] and [[SexySecretary Shion]] [[MaleGaze provides a lot of fanservice for the series.]]
198* MonsterTown: The Goblin Village. Under Rimuru's leadership and the help of a growing number of advisors, more and more races join the expanding village until it becomes an outright ''Monster Nation'' known as Tempest.
199* MusclesAreMeaningless: A monster's power is tied to their magicules, not their physical bodies. For example, Benimaru got a huge power jump by evolving from an ogre to a kijin even though he got physically smaller. And then you have the likes of [[WorldsStrongestMan Milim]], whose physical strength lets her send people and things flying with ease despite having a build of a petite female teen at best.
200* NoBiologicalSex:
201** Demons don't appear to actually have fixed genders. Guy can switch between a male and a female form as he pleases, though he defaults to male. Diablo seems to have no sex at all, though 'he' is beautiful either way and presents as male. Carrera, Testarossa, and Ultima are either all-female or simply choose to look that way.
202** Slimes by default don't have any fixed genders or sexes from both not needing sexual reproduction and as a rule just plain not sentient enough to acknowledge such things.
203* NotDistractedByTheSexy: Almost ''everyone'' is this when they're around [[InnocentFanserviceGirl Milim Nava]] while she's in her [[{{Stripperific}} skimpy outfit]], which is justified since her potential for obliterating the countryside scares them too much to comment on her fashion choices. The sole exception to this is [[ChivalrousPervert Gobta]], who occasionally gives BrutallyHonest comments about her [[ReallySevenHundredYearsOld physical age]] not matching her attire, to which [[ACupAngst Milim]] responds with a [[FingerPokeOfDoom light smack]] whenever he does so.
204* NewLifeInAnotherWorldBonus: Beyond just Rimuru, people from Japan getting transported to the other world is actually a common occurrence, though Rimuru's method of getting there by dying and coming back as a different species is an unusual case. People from our world get a huge magical power boost whether they ended up there by chance or by being summoned, though those who were summoned are not as powerful as the former, and those who were summoned as children are unable to properly use their powers and die unless they bond with a strong spirit to help them control their powers.
205* OddFriendship: A slime and a dragon? Who would have thought it?
206* OlderThanTheyLook: Most Demon Lords look like they're in their 20s-early 30s but have lived over a hundred years at least. Milim is an excellent example as she looks and acts like she's in her early teens but is stated to be the strongest and oldest of the Demon Lords.
207* OurCryptidsAreMoreMysterious: Introduced very late in the light novels, the Cryptids are an ancient race of monsters born from the magicules of [[DraconicAbomination World Destroying Dragon Ivarage]] and are native to the Otherworld he's been sealed in by Veldanava and watched over by the angels. They come in two types: Insect and Beast, and as a rule they are extremely powerful yet thoughtless monsters who live to fight and dislike working together. The Insect types would break off and become the Insectar race (the same race Razul, Apito, and Zegion belong to) after the birth of the sapient Insect Lord Zelanus. Dino implies that Kumara and by extension her mother are also sapient Cryptids.
208* OurDemonsAreDifferent: They were originally called Dark element spirits and are spiritual lifeforms that dwell in the underworld. They only appear in the material world if summoned and quickly disappear if not given a suitable physical vessel as it takes a lot of energy to maintain themselves in the material world, though as a trade-off while they're still solely spiritual beings they're immune to physical attacks and can only be harmed by magic and Skills.
209* OurDragonsAreDifferent:
210** They are among the most powerful races in the whole setting, "descended" from the True Dragon Stellar King Veldanava. They can take various forms, but they mostly resemble Western Dragons physically and start off as rather dumb beasts, but [[StrongerWithAge grow stronger and smarter as they get older]]. The final evolution of the line are Dragon Kings/Lords, who have the ability to take a humanoid form. There are four 'types': fire, ice, wind, and earth, though some can obtain special evolutions through various circumstances. The Sky Dragon Rimuru fought was an aberration of the wind type, while the [[{{Dracolich}} Death Dragon]] who works with Adalman is a dragon that lost its original typing when it became an undead.
211** The [[DragonsAreDivine True Dragons]], however, are another beast entirely. Whereas normal dragons are still flesh-and-blood beings to an extent, the True Dragons are spiritual beings who are more akin to sapient forces of nature and gods, and there can only be one specific type of True Dragon at a time as designated by The World. [[ResurrectiveImmortality If one dies, it will eventually resurrect]] (albeit with some memory loss) save in very specific circumstances.
212* OurDwarvesAreDifferent: Dwarves in this setting are basically humans with beards, who have a cultural fondness for mining and crafting. Their kingdom is 10,000 years old, and fairly cosmopolitan, allowing fair treatment of any being who can get in the gates. Also, while they are usually short and wide, there are several such as Vesta and Gazel who look like they could pass as humans such is their height and generally slimmer forms. They're technically descended of fairies who were incarnated into the physical world and were aligned with the Earth element.
213* OurElvesAreDifferent: Elves are a LongLived race that, depending on how pure ones' blood is, allows them live for centuries or even thousands of years in their physical prime of the 20s before old age rapidly catches up to them in their dying years. This is due to them being strongly associated with the divine powers of their fairy ancestors that incarnated and were aligned to the Wind element. Once in the distant past, the elves were magically and technologically one of the most powerful races in the world with one of the most powerful kingdoms. [[PrideBeforeAFall Then they made the mistake]] of trying to control the Dragon Princess Milim Nava and murdered her pet dragon in the process. Milim [[CivilizationDestroyer destroyed their nation in a rage]] while ascending to [[MaouTheDemonKing True Demon Lord status]] and the freak revival of her pet as the [[MonsterFromBeyondTheVeil Chaos Dragon]] put an end to any hope of the elves reuniting and scattered the survivors to the winds. Some settled in the Forest of Jura and became the equilvalent of '''Wood Elves''', the most successful faction created the Sorceror Dynasty of Sarion as the '''High Elves''', and one of the surviving elven nobility known as [[TheChessmaster Kazaream]] established the Puppet Nation Jistav for those that would become the '''Dark Elves'''.
214* OurGoblinsAreDifferent: The goblin tribe Rimuru originally meets are short and weak physically like children, though they are clever and skilled enough to quickly erect fortifications as well as use basic weapons like spears or bows. After he names them, they transform into Hobgoblins and Goblinas for male and female respectively, who essentially resemble green-skinned adult humans with developed canines and pointy ears save for the ''actual'' children. Except for Gobta, who still appears the same ([[LampshadeHanging "My growth was more of a spiritual type!]]). Personality-wise, however, they're practically no different from tribal humans who have no issues with coexisting with former enemies in peace. They're also descended from fairies that incarnated into the physical world and were aligned with the Fire element, but unlike elves or dwarves they're retained very little of the divine power of their ancestors and hence their comparatively far-shorter lifespans.
215* OurOgresAreDifferent: They're multicolored horned humanoids, whose weapons, armor and architecture are distinctly Japanese in style. Rimuru notes with surprise on first meeting them that they're not the brutes he'd expect based on other media. Also, they're actually considered evolutionary a step-up from goblins, and can evolve themselves into {{Oni}}.
216* OurOrcsAreDifferent: At first, not much different, as they are AlwaysChaoticEvil in their first appearance and are a huge source of trouble for the main characters. [[spoiler: It is revealed they are under the influence of "Starved", a special skill which fills them with an overwhelming hunger. Once the Orc Lord is defeated, they lose these traits and just become a race of TheBigGuy.]] Their appearance is that of the PigMan.
217* OurSoulsAreDifferent: The "soul" is the name given to the spiritual being of humans and monsters, the very core of a person through which there is no deeper "being". It consists of three parts: The Nucleic Heart (the core of the soul where Skills are engraved), the Ego (which is where the memories and sense of self are stored), and the Astral Body (the container for the soul and the form of a being), the last of which requires the actual "body" (be it spiritual and/or physical) to hold everything together and be called "life". The soul is what undergoes the process of {{Reincarnation}} and usually begins to degrade as soon as the body dies, but certain beings have the innate abilities necessary to endure and survive on as spiritual beings without their flesh, at least for a time.
218* OurVampiresAreDifferent: They physically resemble humans who need to drink blood to survive, although this ceases to be a necessity once they reach a sufficient age and power level, and they don't even need to fully drain a person to support themselves. They follow an aristocracy. They also have their powers weaken during a new moon. They possess various classic powers such as SuperStrength, transformation, regeneration, and hypnotism. Notably, they were technically a DyingRace at one point since their population relies on the well-being of humans, which ended up devastated by massive wars and Veldora's indiscriminate rampages, to the point that their VampireMonarch [[spoiler:founded and set herself up as the shadow ruler of the human-centric Holy Empire and god figure of the Western Saints Church while also creating an underground kingdom for her people so they could coexist peacefully and in secret.]]
219[[/folder]]
220
221[[folder:Tropes P-Z]]
222* PerfectlyCromulentWord: The "Beastketeers" of Yuurazania, a combination of the words "Beastmen" and "[[Literature/TheThreeMusketeers Musketeers]]". They act as a kind of PraetorianGuard for their liege, the Demon Lord Carrion.
223* PersonalityPowers: Unique and Ultimate Skills are effectively this crossed with SoulPower, as unlike the lower tiers of Skills (which can be obtained between beings of the same race or may be held by otherwise different beings) their effects are effectively reflections of the personality and soul of their holders. For this reason, [[ThereCanBeOnlyOne there can't be two holders of the same Ultimate Skill living at the same time]], and while it might be possible (though unlikely) for more than one person to possess the same Unique Skill in ''name'', the specific effects of it will likely be different between users. The only exception would be possessing the ability to somehow copy said Skills, [[spoiler:and only Guy Crimson, Rimuru, and Yuuki have the Skills or abilities to do that]].
224* PlantPerson: Dryads are very rare and the 'C.E.O' of the Great Forest. Treants are also mentioned.
225* PowerEqualsRarity: As a [[RPGMechanicsVerse world building trope]] in the setting. Regardless of what it is, generally the rarer something is the more powerful it tends to be. Whether it refers to powerful species like Ogres and Tengu who are dwarfed in population numbers by much weaker species like goblins or items that increase in power based on who rare they are such as potions and weapons, it hold true. The most egregious application is seen in skills. Rare Skills are stronger than more common ones. Unique Skills host a plethora of lesser Skills within them and cannot be blocked by any skill that is not itself a Unique or Ultimate Skill. Speaking of which Ultimate Skills are even rarer still and grant RealityWarper powers to whoever has one, making them immune to basically anything that is not itself an Ultimate Skill.
226** The power of Ultimate Skills far and away dwarfs unique skills, not just in terms of effect, but also intensity. [Unlimited Imprisonment] would have taken a century to be undone by Rimuru's [Great Sage] and Veldora's [Investigator], but once they became the Ultimate Skills [Raphiel] and [Faust] it was undone in less than a day.
227* PowerLevels: They exist and are used to mainly classify monsters to give a rough estimation of their strength. However, ''Slime'' pokes fun at the concept because these values and the rankings therein only take into account a being's physical ability, their mana/magicules, and the power of their equipment, ''not'' anything that's related to actual combat ability (combat experience, training, magical knowledge, willpower, and Skills). [[WeakButSkilled Hakurou]] even after his evolutions would only be about mid-tier in terms of power, yet it's his experience and skill that lets him reliably beat those with three times his level. The system itself was also technically created by humans, but they ''woefully'' underestimated just how strong some monsters can become due to how few humans can even force a Demon Lord to get serious, let along go all-out (for reference, the minimum requirement to become a Demon Lord would be to have an EP of 200,000. Clayman, one of the weakest Demon Lords active, has an EP of around 400,000 [[spoiler:even before his last-ditch True Demon Lord awakening]], and most of the True Demon Lords are ''at least'' over a million).
228* PoweredByAForsakenChild: The only reason Rimuru was able to get away with his crazy naming sprees was because he was unknowingly draining magicules from Veldora imprisoned inside him.
229* ProphecyTwist: Rimuru has his fortune of a woman he is destined to be with. He assumes that this means lovers. [[spoiler:Said woman actually dies shortly after he meets her, but her dying wish is that he assimilate her.]]
230* QualityOverQuantity: Tempest vs almost anything else. Examples are aplenty:
231** Falmuth came at them with over 20,000 troops plus an assortment of Temple Knights from the Church, but 113 named monsters (Rimuru, Benimaru, Souei, Souka, Touka, Saika, Nansou, Hokusou, Gobta, Rigur, Geld, Hakurou, Gabiru and Gabiru's 100 followers) proceeded to utterly destroy their forces. Heck, Rimuru wiped out the 20,000 Falmuth forces on his own.
232** The quality of Tempest equipment is unmatched in the world, with two of the greatest blacksmiths on the planet working with pride, as well as a few dozen proteges training under them. Compared to other nations who had dozens on hand, but cannot hope to match the quality of the best Tempest goods.
233** The full potions and high potions play on this, while high potions are mass-produced, they are done so with the far harder-to-produce full potion being diluted in magicule-rich water to produce 40 of them. This process is the most resource-efficient, but also the most difficult to achieve. Full potions are not widely available for sale due to their insane cost of 5 gold coins, over 14 times the cost of a high potions 35 silver, and 125 times the cost of a low potions 4 silver.
234** {{Invoked}} on a mass scale by the [[TheEmpire Eastern Empire]], to the point [[EveryoneHasStandards it disturbs Rimuru]] after the fact despite understanding the logic behind it. [[spoiler:Emperor Rudra, Velgrynd, and Tatsuya Kondo have no issue with nearly a million soldiers of the Armored Division being wiped out to a man if the resulting slaughter would invoke a TraumaticSuperpowerAwakening in even just about a half-a-dozen specific individuals to the level of Demon Lords, considering that a net positive. In fact, they have a precedent for it with the first failed offensive against Veldora in the distant past. The only thing they didn't anticipate was Tempest managing to be completely thorough and kill them all.]]
235** This principle holds true throughout the story. This world is one where individuals can gain enough power to massacre entire nations all by their lonesome. Anyone that is considered part of the Calamity class is at least a OneManArmy. Disaster-class individuals are a PersonOfMassDestruction. Should someone rank in the lofty heights of the Catastrophe class, they are easily the equivalent of a PhysicalGod. Tempest has multiple of each class within their ranks.
236* QuirkyMinibossSquad: Various Demon Lords have some variant of this, often well characterized and given screen or page time to develop their personalities.
237** The Beastketeers under Demon Lord Carrion.
238** The Five Fingers under Demon Lord Clayman.
239** The [[spoiler: Moderate Jester Troupe]] under Demon Lord [[spoiler: Kazaream]]
240** Rimuru originally, ostensibly, had the Big Four. Later he formed the Twelve Guardian Lords.
241* RealityIsUnrealistic: Megiddo is actually realistic, converting enough solar energy to make a death beam with the potentcy of an industrial laser cutter would only need a lens with a diameter of 2.14 meters. The lenses used in Megiddo are 3 meters wide, making them more than potent enough to pierce through steel plate and brain matter.
242* RealityWarper: Technically, anyone who possesses an Ultimate Skill is automatically one. According to Guy Crimson, all the natural laws that rule the world are "nothing more than unique cases to them", as Ultimate Skills give the wielders fittingly ultimate power to control the very laws of nature and can only be countered by another Ultimate Skill.
243* RecapEpisode: Episode 24.5: "Tales: Valdora's Journal" takes place right after Rimuru absorbs [[spoiler:Ifrit]]. Valdora is quite pleased to see a formidable opponent to join him, and immediately teaches him how to play Shogi. The episode takes place over the two years that have passed in the first season. While clips of the entire first season up to that point play out, the two engage in banal conversation that has almost nothing to do with Rimuru's progress, though they do give a general recap of the major story arcs. They're just enjoying each other's company while playing Shogi.
244* {{Reincarnation}}: They're rare but have enough presence that people know what the deal is with them (i.e. they have power, be it skills or resistances, based on the conditions they died in and their choices). Rimuru and Shizue are known examples. People who are reincarnated are given a choice of what kind of power is blessed to them by the "Voice of The World" in addition to a blessing of power based on the conditions they died in. Most of them tend to retain their original form, however, which is why Rimuru's [[BeCarefulWhatYouWishFor accidental]] rebirth as a slime is noted to be rather odd.
245* ReincarnateInAnotherWorld: It's right there in the name, and these specific type of Otherworlders are explicitly ''called'' "Reincarnators".
246* ReincarnatedAsANonHumanoid: Satoru goes from exhausted office worker to slime as Rimiru, and gets stronger over time. Whilst he gets a humanoid form fairly quickly, his "base" form is still basically an [[CuteSlimeMook adorable puddle of goo]].
247* RiteOfPassageNameChange: Monsters typically don't have individual names, the only exceptions being leaders and the direct subordinates of leaders. This is because named monsters receive a massive boost in their PowerLevels, their boost proportionate to the ones who named them. When Rimiru named all the goblins and direwolves in the village, they all evolve into Hobgoblins and Tempest Wolves.
248* RunningGag:
249** In ''The Slime Diaries'', after Gobta remarks how delicious slimes are, with Shuna and several other characters agreeing, Rimuru -- who sees them surround by an aura of killing intent -- jumps to the conclusion that they're plotting to eat him and runs away as fast as he can. This is referenced a few times, with Rimuru low-key panicking whenever characters comment how delicious food shaped like him is in a way that sounds like they're talking about him.
250** In ''The Slime Diaries'', whenever a scene starts between Milim and Shion, Milim always refers to Shion as "one-horn lady", which acts as a sorta PhraseCatcher for Shion to say "it's Shion", followed by Milim saying "yeah, that!" This humorous example of Milim's AccidentalMisnaming habit happens ''every time'' the two have a conversation.
251* SealedEvilInACan:
252** Veldora might not be "evil" in the moral sense, but his indiscriminate destructive rampages were so dangerous for the world that few people had issues when the True Hero used her Unique Skill [[SpaceMaster Unlimited Imprisonment]] to seal him away.
253** The Holy Ark that is the most secret and prized treasure of the Holy Empire of Ruberios is actually [[spoiler:the sealed body of said Hero, Chloe/Chronoa, partially to prevent the [[SuperPoweredEvilSide Chronoa personality]] from taking over without resistance while Chloe and Hinata's time-displaced souls are indisposed due to [[NeverTheSelvesShallMeet their current selves still being in the present timeline]].]]
254* SelfFulfillingProphecy: The reason why the Falmuth Kingdom attacks Tempest is out of the fear that their growing power and political influence risks destroying their kingdom through taking over their trade system, so they attacked first to prevent that. Due to their actions, Rimuru and his surviving subjects are so enraged that they do indeed use their power and political influence to destroy their kingdom, only instead of doing it indirectly, obliviously, and without violence, they do it directly, intentionally, and ''very'' violently.
255* SevenHeavenlyVirtues: Represented by the virtue series of ultimate skills. Each of them is named together with an archangel. [[spoiler:Collecting all skills of this series would allow its user to unseal the Mind of the Angels.]] There is also a secondary effect of the virtue series skills, namely that [[spoiler:anyone who has one is vulnerable to being put under MindControl via Justice King Michael.]]
256** Justice King Michael wielded by [[spoiler: Emperor Rudra, later claimed by Velda]]
257** Wisdom King Raphael wielded by [[spoiler: Rimuru]]
258** Covenant (Faith) King Uriel wielded by [[spoiler: Rimuru]]
259** Purity King Metatron wielded by [[spoiler: Leon Cromwell]]
260** Patience King Gabriel wielded by [[spoiler: Velzard]]
261** Hope King Sariel wielded by [[spoiler: Chloe O'Bell]]
262** Charity King Raguel wielded by [[spoiler: Velgrynd]]
263* SevenDeadlySins: Represented by the Sin Series of the ultimate skills. Each of them is named together with an Archdemon. [[spoiler: Collecting all skills of this series would allow its user to unseal the evolution tree of the Demons]]
264** Lustful King Asmodeus used by [[spoiler: Ruminas Valentine]]
265** Gluttonous King Beelzebub used by [[spoiler: Rimuru Tempest]]
266** Greedy King Mammon used by [[spoiler: Kagurazaka Yuuki]]
267** Slothful King Belphegor used by [[spoiler: Dino]]
268** Wrathful King Satan used by [[spoiler: Milim Nava]]
269** Envious King Leviathan used by [[spoiler: Ice Dragon Velzard]]
270** Prideful King Lucifer used by [[spoiler: Guy Crimson]]
271* SeriousBusiness:
272** Offering to name someone is this from a monster's perspective. Naming a monster involves imparting one's magicules to the recipient, which has the risk of weakening (or even ''killing'') the namer through magicule drain if they name too many at once or name someone too strong.
273** Declaring yourself a [[MaouTheDemonKing Demon Lord]] or a Hero is this for monsters as well. To call yourself the former is to stake your claim that you deserve a seat at the Demon Lord Council, and if no existing members are willing to vouch for you, you can expect an ''actual'' Demon Lord to show up at your doorstep to test you personally. Proclaiming yourself the latter is implying that you are the destined rival of the Demon Lords who will stand up to them if they get out of hand, and will get much the same reaction. That's why most humans use the term "Champion" instead.
274* ShoutOut:
275** When testing out his newly-acquired Steel Thread ability in the anime, Rimuru lets out a Franchise/{{Tarzan}} yell.
276** The design and animation of Ranga's father brings [[Anime/WolfsRain Kiba]] to mind.
277** In Episode 6, Rimuru tries to break the ice with the adventurers by saying "I'm not a bad slime!", which is a line friendly slimes in ''VideoGame/DragonQuest'' tend to say as a greeting. Shizue [[NotSoStoic cough-laughs]], and later reveals she knows the line is from a video game thanks to another reincarnated person she knows.
278** In Episode 20, Haruna and the main Goblin Cook sprinkle salt onto a sliced up Megalodon while striking the same pose as [[https://www.youtube.com/watch?v=J5GGG0PaSe4 the "Salty Bae" meme]].
279*** Also in episode 20, Rimuru and Yuuki discuss among other things ''Manga/AhMyGoddess'''s anime, what number [[Franchise/FinalFantasy "FF"]] is up to, and the fact that ''Manga/GlassMask'' is still going.
280*** Again in episode 20, Rimuru prints out a whole library of manga for the adventurer's guild grandmaster. The last one he puts on the pile? ''Manga/LandOfTheLustrous'', another progression fantasy about an underestimated, androgynous hero.
281** In the Christmas episode of ''The Slime Diaries'', Milim uses a [[Manga/JoJosBizarreAdventure Thunder Cross]] on Rimuru after mistaking him for Santa Claus.
282** In Episode 47, Rimuru orders Veldora to keep Milim at bay during their fight against Clayman. When he gets enough of a breather to check up on Veldora, he's [[https://www.youtube.com/watch?v=wRupVm670YQ seen]] spamming [[Franchise/StreetFighter Hadoukens]] at Milim, then pursuing her in the air with a {{Shoryuken}}, [[HurricaneKick Tatsumaki Senpukyaku]], and a [[VideoGame/VirtuaFighter Tetsuzanko]], finally ending his "combo" with a [[Franchise/DragonBall Kamehameha]]. Rimuru can only watch in exasperation, wondering out loud where he learned all those special moves. He later claims to have copied these moves from [[SeriousBusiness the sacred texts]] much to Rimuru's dismay goes on to teach some other characters he takes as his disciples his fighting style.
283** Veldora is frequently seen reading various manga from Magazine/ShonenMagazine volumes Rimuru had managed to recreate from memory with help from Raphael and sometimes is sitting beside a comically large pile of them. In the light novel it's only mentioned that he is reading them but the anime will occasionally show the covers which have featured several different real world series such as ''Manga/HowNotToSummonADemonLord'' and ''Manga/CellsAtWork''.
284** The God Series of Ultimate Skills are named after the Great Old Ones and Outer Gods of the ''Franchise/CthulhuMythos''.
285* ShowyInvincibleHero: Tempest rarely struggles and essentially never loses. Rimuru himself has only lost a single legitimate fight, with all others being victories or he was smart/clever enough to make his opposition give up non-violently despite their possible advantage.
286* SitcomArchNemesis: Between Shion and Diablo. Mainly because they are both Rimuru's secretaries. Despite the demon's greater intellect, experience and power, he shares the same mindset as Shion (ie LeaveNoSurvivors as the first option) so both tend to offer the same sort of solutions. They both needle each other as Diablo is far more useful in various tasks but Shion is much closer to Rimuru.
287* SneezeCut: In Chapter 89 of the manga, when Rimuru notes to Gabiru how he's going to be joined by the [[DemBones skeletal]] Adalman in Veldora's cave, to which Gabiru responds with a shocked shout, the following panel has Adalman coughing in a sneeze-like way despite lacking sinuses.
288* SoLastSeason: The story can go through this quickly as a result of Rimuru and his followers gaining more strength from foes either joining their cause or being absorbed to add their power to Rimuru's. As an example, a lesser demon puts up an okay fight against Rimuru, then he summons a greater demon to inhabit a golem. Next is an archdemon, at which point greater demons are total loser small fries. Then archdemons become fodder to hype up Demon Peers, [[AvertedTrope who break this trope without even trying]]. [[WorldsStrongestMan Guy Crimson]] falls into the 'Demon Peer' catagory, and everyone is cautious of him.
289* SpellBlade: There are several variations of this.
290** The first is to channel and wrap your own magical energy around your weapon like a "sheathe". Rimuru technically first did this when Great Sage [[FlamingSword coated his katana in Black Flame]] during the fight with the Orc Disaster, and he later did this himself when he shrouded his sword in magical energy to defeat a summoned demon during his Adventurer Ranking test (as the demon was otherwise immune to physical attacks and he didn't want to launch a massive magical attack or use Gluttony in full view of a bunch of strangers). This method can be taxing for the average person to use for very long, however, and is usually only really practical with magisteel or similar weapons.
291** The second is to carve [[RunicMagic magic runes]] into the weapon during or after its creation. By activating the runes, you can then use the elements in question. While less magical taxing and in theory anyone could use such a weapon, however, the problem is that a weapon can only take at most two different runes before being ruined, and it's impossible to remove the runes once they're carved in. Rimuru can do a variant of this by using the Unique Skill [Degenerate] to merge the magic of choice directly into said weapon and switch it out at will, but obviously this is something only someone with a similar Skill could reliably do.
292** The third is to simply [[EvolvingWeapon let your weapon evolve with you]]. This however takes lots of time, can only be done with a high-quality magisteel weapon, and there's no guarantee that you'll get the exact traits you want when it starts evolving.
293** The fourth is one of Tempest's creation, involving creating weapons with sockets in them (a maximum of three) that one can insert {{Power Crystal}}s containing various magics at will. By mixing-and-matching magic cores, you can strengthen or create various combinations of elements. The only cost is that this is a hard weapon to craft; only [[UltimateBlacksmith Kurobee]] can reliably make the three-slot weapons (and even then that's one in a few ''hundred'' attempts), Kajin can only get up to the two-slots, and even the very best apprentices are lucky to successfully make one-slot weapons.
294* SpoilerOpening:
295** The first anime season's first OP has a number of minor spoilers here and there with the most notable one being that Rimuru will gain the ability to shift in and out of a human form.
296** The second anime season's first OP continues this, such as showing a glimpse of [[spoiler:Veldora's]] human form, Milim's [[BlackKnight Battle Mode]], and [[spoiler:Wisdom King Raphael]], all of which only first appear in the last two episodes of the first half of the season.
297** The second opening of same season also shows the remaining Great Demon Lords like [[spoiler:Dagruel, Dino and Luminous Valentine]].
298* SpottingTheThread: During the ''ISEKAI Memories'' crossover event with ''Literature/Overlord2012'', Rimuru makes a comment about needing business cards when introducing himself to Ainz as a personal in-joke, only for Ainz to not only ''know'' what business cards are to the point of musing he should have some made, but the way he says it reminds Rimuru of a "business man" rather than "skeletal overlord". Ainz's nostalgic reaction to seeing a Japanese-style room in Tempest, and more importantly being able to correctly identify it as such, is just the final confirmation.
299* StandardJapaneseFantasySetting: Set in an RPGMechanicsVerse that mainly draws from medieval Europe but has a cabal of [[MaouTheDemonKing demon-lords]] and heroes who are often summoned or reincarnated from other universes. The main character, Satoru Mikami, is reincarnated as a slime dubbed Rimuru Tempest. He becomes the leader of a village of goblins (which evolve into hobgoblins), gradually accruing more followers of different monster species -- including ogres (which evolve into oni), pig-man orcs, and lizardmen (which evolve into dragonewts). He also forges dipilomatic relations with some of the neighboring human and dwarven kingdoms; befriends dragon-gods, heroes, and demon lords; and wages war against a corrupt church and the kingdoms under its sway.
300* StrongerWithAge: A general rule of reality in this work. The older something is, the more powerful it is. Even true of ostensibly mortal races like humans; once they reach a certain level of power, they evolve into stronger forms with longer lifespans. Any human say, 300 years old, is much more powerful than an average joe. A sufficiently aged unnamed monster can defeat a younger, similarly ranked one that even has the extra advantage of a name for a power boost, as proven when [[spoiler:[[MonsterProgenitor Diablo]] when he was still unnamed as Noir defeated Orthos despite both of them being the same rank at the time with the latter being named.]]
301** Granted, there are ways to bypass this. The shared name Rimuru and Veldora possess does not increase power, but instead is considered 'Equal Status Naming' which has an absurd impact on their growth potential. Rimuru's growth potential rivals that of the true dragons, and even Veldora benefits due to the fact that it affects skill growth as well. He could not have recieved Faust if not for Raphiel being able to boost his processing power through the shared name.
302* StupidSexyFlanders: Rimuru resents Souei's good looks, compounded by the speed at which he picks up extra skills. He has similar feelings about Benimaru and his CluelessChickMagnet status. Ironically, Rimuru himself tends to inspire this in others.
303* StunnedSilence:
304** All the Lizardmen and Rimuru have this when Gobta defeats their leader Gabiru in a single kick. The lizardmen can't believe Gabiru was defeated so quickly, while Rimuru can't believe Gobta actually ''won''.
305** Later, Souei slaughters the orcs in the caves of the Lizardmen so impressively and elegantly that Gabiru's sister is gawking in shock. Her father (the chieftain) and his attendants have the same reaction when Souei puts the last orc attempting to ambush them into a YouAreAlreadyDead situation with razor wire, causing her to hang a lampshade on this trope.
306* SummonEverymanHero: What the Otherworlders known as "Summons" effectively are, and the key difference from "Reincarnators" who end up in this world at random (usually via death and NewLifeInAnotherWorldBonus). In theory, it's ''supposed'' to be a ritual meant to summon someone with the potential to become a Hero, blessed with incredible powers and skills that will be strong enough to someday challenge even the might of the strongest Demon Lords. In practice, it's been abused by many kingdoms who want the advantage of summoned Heroes with enhanced abilities and powerful Skills gained from crossing over to this world ([[GivingRadioToTheRomans or even just knowledge of their original world that could be put to military use]]) to serve as a bolstering force for their military might, and the most unscrupulous ones can carve special runes into the Summons' souls that bind their loyalties to their summoners on threat of death (and they're very much aware of this). And the Summoned doesn't exactly get a choice in the matter or even the chance to ''refuse'', plucked from their old lives at any moment. The process is especially bad when [[KidHero children]] are involved, as they often don't develop the special skills needed to channel their large reserves of acquired magicules, and will usually die in a few years' time without stabilization from bonding with an elemental spirit. Rimuru truly thinks it's a horrible thing from the first moment he learns about it from Veldora, and once he starts getting influence through Tempest's economic and political power starts advocating for cracking down on Summons.
307* SuperSoldier:
308** The [[DimensionalTraveler Otherworlders]] are often sought after by various human kingdoms to serve as this. In this world, humans on average lack access to magic or skills, and in order to harness it one must either be born with the aptitude or risk one's life living in [[{{Mana}} Magicule]]-rich environments in order to passively absorb them and gain the ability to wield them as high levels of environmental Magicules are ''toxic'' to life that isn't adapted to it. Otherworlders, on the other hand, acquire a massive amount of magicules from the process of crossing the dimensional plane to this world and have plenty of natural talent at harnessing magic and Skills as a result. "[[SummonEverymanHero Summons]]" are often the result of attempting this, but not every Otherworlder develops the combat Skills (or even possesses the fighting mindset) wanted. Plus, [[ChildSoldiers child Otherworlders]] often don't develop the Skills to channel their Magicule supplies ''at all'', and as a result their underdeveloped bodies can't handle their power and they die young.
309** The Holy Empire of Ruberios and the Western Saints Church has their paladins, considered the elite of their military. Each one is trained rigorously to master the combat arts, given high-tier weaponry and equipment, and are often trained in various magics such as Elemental, Summons, and/or Holy depending on their strengths. Even the average paladin is on record as being called worth ''1000'' normal human soldiers. The strongest paladins are ranked among the Ten Great Saints, each being at least an Enlightened/Sage, and their leader is Hinata Sakaguchi, a Saint who mastered all the combat arts and magics taught to her, wields Legendary-class weapons and armaments that allow her to temporarily stand up against True Demon Lord-level threats, and is considered by almost everyone who knows of her as the strongest human outside of the Eastern Empire.
310** [[TheEmpire The Eastern Empire]] boasts a total military strength of 2.1 million soldiers, which quantity-wise is by ''far'' the largest army in the world. As this is a world where HumansAreAverage and monsters capable of destroying entire towns or [[OneManArmy single-handedly slaughter an army of normal humans]] are ''frightenly'' commonplace, they've also taken the time to shore up their troops quality-wise.
311*** The Armored Division, the main division of the army, has subjected its members to magical modifications that allow them to survive a full week without eating or drinking alongside increasing their physical parameters. They're also equipped with the latest of [[GivingRadioToTheRomans Otherworlder technology]], including firearms, tanks, and airships.
312*** The Magic Beasts Division has utilized and weaponized DNA analysis technology to create and breed powerful Demonic Beasts that are ridden by warriors carefully screened and trained for the job. [[spoiler:They've also developed a special secret drug that would in theory allow the rider and beast to perform a FusionDance to become a MonsterKnight of even greater power, but [[SuperPowerRussianRoulette the potential risks of death, insanity, and/or permanent monster transformation]] mean it's only meant as a last resort.]]
313*** The Composite Division are technically the RagTagBunchOfMisfits of the army, where the fighters too uncontrollable were placed. The reason they're so "uncontrollable" is because most of them are [[TrappedInAnotherWorld Otherworlders]] blessed with unique sets of skills and physical/magical abilities that makes it too awkward to organize them as a proper disciplined military force. This is also the place where human experimentation to produce more powerful soldiers was carried out, resulting in the creation of unique "human weapons" that remained under the banner.
314*** And finally there's the Imperial Guard, the 100 chosen warriors of the TheEmperor. Together, they're considered worth the other three corps ''combined'', as each fighter is at least the level of an Enlightened/Sage and equipped with Legendary-class equipment (which according to [[TheHero Rimuru]], comparing such a weapon to a "normal" weapon is like "bringing a machinegun to a sword fight"). The single digits are even stronger, having all the advantages of the double digits alongside [[SuperEmpowering a blessing from the Emperor]] that gives them a pseudo-Ultimate Skill, making them borderline {{Reality Warper}}s. The top six are at the level of Saints and wielding the even stronger Mythical/God-class equipment.
315** Finally we get to Tempest and [[TheLegionsOfHell The Black Numbers]]. Each one of the 711 is a powerful demon, hand-picked by Diablo himself, and granted special artificial bodies tailor-made by Rimuru and Ramiris to serve as ideal hosts. While there are individuals in Tempest that are stronger, they are the strongest unifed unit in Tempest, and their commanders are four of the seven Colored Primordial Demons, the same kind of demon that [[WorldsStrongestMan Guy Crimson]] is.
316* SupernaturalSensitivity: All monsters have Magic Sense, which detects nearby sources of magic, gauges PowerLevels in individuals, and can be used to communicate telepathically.
317* SurprisinglyRealisticOutcome:
318** Humans (even most evolved humans short of Sainthood) need air to breath, and this has been exploited twice. The first was with one of the traps in the labyrinth, sealing off the room in a way no air would get in or out, meaning setting a campfire could asphyxiate you. This was also used by Guy Crimson against [[spoiler:Yukki, since [[AntiMagic Anti-Skill]] has no effect on non-magical fire, meaning Guy burned up all Yuuki's air and he would have suffocated if he didn't realize what was happening and deal with the fire. Yuuki has to outright forcibly evolve his body to a fully-matured Saint, removing his human limits in order to remove that method of attack (even if the fight still goes against him)]].
319** Rimuru being officially declared the administrator of the Jura Forest [[spoiler:by the decree of his fellow Demon Lords post-Walpurgis Banquet]] immediately brings up new complications to his rule of the Jura-Tempest Federation that he completely missed out on before his subordinates fill him in. Originally, the title of "Administrator of the Jura Forest" he was bestowed after defeating the Orc Disaster technically only applied to the area that the [[PlantPerson Dryads]] (the ones who bestowed that title) had full influence over. This didn't actually make him the sovereign of the entire forest region itself, and there were many monster races and tribes living on the other side of the forest's great river that weren't actually beholden to any of his potential decrees and could continue to live their lives as they wished. Now that he's been given full official control of the territory [[spoiler:as a Demon Lord]], the forest really ''is'' a country under his jurisdiction, meaning those tribes are now citizens with which he can do as he pleases and they have to obey (as now even the act of cutting down a tree in the forest unauthorized can be seen as grounds for breaking the law) unless they want to risk being hunted down as criminals.
320* SuspiciouslySpecificDenial: Veldora certainly doesn't find the heroine who sealed him away attractive, nope. He doesn't think she has lovely hair or that her pale skin is lovely or that she has a personality that he likes.
321* TacticalRockPaperScissors: On paper, this rule applies to spiritual lifeforms. Spirits are strong against demons, demons are strong against angels and angels are strong against spirits. Like everything, there is nuance in this dichotomy, with rank and experience of the summoned entity making a difference, the Archdemon Diablo destroying a standard Earth spirit with one hit.
322* TakesOneToKillOne: This logic goes behind the powers of the Ultimate Skills, with few exceptions. According to Guy Crimson, [[spoiler:when musing over Clayman "apparently" mind-controlling Milim]], only another Ultimate Skill can hope to overpower an Ultimate Skill, and lower-ranked skills simply didn't ''work'' on those who possess Ultimate Skills. [[spoiler:So if Milim is being "controlled", it's only because she's NotBrainwashed and just playing along for her own amusement.]]
323* TitleDrop: At the very end of the web novel, [[spoiler:Satoru Mikami, saved from death by the reality-defying power of Rimuru, free to live out his life safe of any paradoxes, and carrying at least some of knowledge/memory of his other self, decides with his junior Tamura's encouragement to tell him all about "that time I got reincarnated as a slime".]]
324* TookALevelInBadass: If a demon/monster is named by a strong individual, he/she gains more power.
325* WarArc: All over the place, though technically several of them bleed into each other.
326** The first proper one would be the fight against the Orc Disaster, as it involves Rimuru forming alliances with the various races of the Jura Forest to combat the vast 200,000-strong Orc army.
327** The Falmuth Invasion Arc, as it has Tempest going to "war" with the Kingdom of Falmuth's army, though in practice it was closer to Falmuth's unprovoked sneak attack on Tempest followed by Tempest's [[RoaringRampageOfRevenge swift retribution]].
328** The Walpurgis Banquet, which is essentially a follow-up to the Falmuth arc and consists of Tempest and Yuurazania fighting Clayman's army and (relcutant) allies in Milim's Dragon Faithful, the simultaneous assault on Clayman's castle, and the clash between Rimuru and Clayman themselves alongside personal subordinates at the banquet itself.
329** The Eastern Empire War Arc involves Tempest clashing against the might of the Eastern Empire, which fields over a ''million'' soldiers of their army into the war effort.
330** The Tenma Great War Arc, which the Eastern Empire War could be seen as the prelude to, is the GrandFinale where Tempest and their allies across the world fight the true BigBad [[spoiler:and TheArmiesOfHeaven]].
331* WeHaveReserves: In the Eastern Empire War Arc, the titular empire throws a million soldiers (almost ''half'' of their overall fighting force) at Tempest in a direct assault and the Empire's immense numbers get [[CurbStompBattle utterly crushed]] fighting in Ramiris's [[DomainHolder Labyrinth]]. [[spoiler:Later it is revealed that they were [[XanatosGambit expected to lose (however, winning would have certainly been favorable as well)]] the fight but in the process the trauma of the defeat was meant to trigger an [[MookPromotion Awakening in some of the survivors]] to the level of Saints, which would have [[ConservationOfNinjutsu more than made up for the loss of raw manpower]] as far as the top brass were concerned. However, technically speaking there were no survivors left to do this other than the lucky ones Rimuru was able to revive. And even then, the top brass simply decide this means Tempest has earned the "right" to face their most elite warriors that would make that million-strong army look like toy soldiers as they set about their true goal: capture Veldora by whatever means necessary.]]
332* WhamEpisode:
333** Episode 8, where [[spoiler:Shizu dies]], despite [[ShipTease being set up as a Rimuru's partner]].
334** Episodes 31 and 32. [[spoiler:Due to being delayed by the hero Hinata, Rimuru arrives back home to find that while he was gone, the Kingdom of Falmuth had orchestrated a massacre which killed hundreds of innocent civilians and declared war upon Tempest under the casus belli of "eradicating the evil monsters". And among the causalities is Shion. Before Rimuru has the chance to absorb the corpse to put them to rest though, Cabal's group arrives and Ellen reveals that there might be a way to resurrect the fallen, but it would require that Rimuru become a True Demon Lord. The process would require at least ten thousand souls to fuel the ascension, and Falmuth's invading army just so happens to have twice that amount...]]
335** Episode 47 and 48. [[spoiler:Milim reveals she was always PretendToBeBrainwashed and never under Clayman's control, and that Frey and the supposed-dead Carrion were conspiring with her. Clayman achieves his Awakening to True Demon Lord level, but is unable to defeat Rimuru and is ultimately killed. Rimuru takes his place at the seat of the Demon Lords, now known as the Octogram with Frey and Carrion stepping down, and Demon Lord Roy is revealed to simply be a PuppetKing for the ''actual'' Demon Lord Luminous Valentine. Finally, Clayman's comrade Laplace [[NotSoHarmlessVillain reveals he's actually much stronger than the Demon Lord]] when he ruthlessly and swiftly kills Roy after the vampire mocks Clayman's end to his face, showing Clayman is far from the biggest threat still facing Rimuru.]]
336* WhamLine: Episode 47: As it becomes rapidly apparent to Clayman that he has been {{Outgambitted}} and forced into a fight with Rimuru and his subordinates that he can't win, he attempts to [[spoiler: order Milim to kill everyone so that he can escape]], the following line hammers home just ''how'' thoroughly Clayman was played.
337-->'''[[spoiler:Milim]]''': [[spoiler: [[NotBrainwashed Why would I do that?]] [[PretendToBeBrainwashed Rimuru and Shion are my friends.]]]]
338* WhatKindOfLamePowerIsHeartAnyway: Otherworlders get [[NewLifeInAnotherWorldBonus powerful skills]] based on their desires when entering the world. For Satoru though, he was dying as he was being reincarnated into Rimuru, so his thoughts and desires are a jumbled mess of thoughts like "I'm bleeding" and ImColdSoCold giving him a "blood-free body" and "Resist Cold" and "I can't believe I'm dying a virgin. I'm going on the prowl in my next life, instead of living a mountain sage on the way to being a great sage.", giving him Predator and Great Sage. As the Otherworlders summoned by Farmus prove, the kind of people who get powerful combat skills aren't necessarily the good kind.
339* TheWorfEffect:
340** Characters are often compared to a vague 'Demon Lord' or 'Awakened/True Demon Lord' level and for mooks it's always the vague A rank or above A rank metric. This can be confusing since one of the first demon lords seen, Clayman, goes down like a complete chump since Rimuru has already reached that level of power when he fought him, while "True Demon Lord" can range from small fry like Ramiris to literal gods depending on how much power they gained before their ascension and how much they kept building it up afterwards.
341** It's a pointed out in the light novel that anyone who reaches a certain level of power can ''proclaim'' themselves a Demon Lord, but in order to be officially recognized as such they need the backing of two existing Lords or be ruthlessly crushed by the established ones. So many such self-proclaimed Lords have come into existence that at least one human kingdom doesn't even consider it a big deal. Milim herself notes Rimuru had already surpassed the minimum power requirement to become a Demon Lord just days after fighting and absorbing the Orc Disaster. A similar case occurs with the "Ten Great Demon Lords": only four of them were "True" Demon Lords, while most of them were only self-proclaimed Demon Lords of varying degrees of strength. [[spoiler:Carrion and Frey even stepped down after Rimuru defeated Clayman since they realized they couldn't match up to the rest anymore.]]
342* WorldOfTechnicolorHair: A more justifiably limited example, where humans and human-adjacent races (dwarves and elves) only have hair colors common in real life, while completely inhuman races like shapeshifted slimes, oni, goblins, demons, and more commonly possess a wide range of hair colors, such as blue-haired Rimuru, lavender-haired goblins, green-haired dryads and witch Myulan, and demon-kind possessing hair matching the {{Color Motif|s}} of their associated progenitor, of which four (Testarossa/White, Ultima/Purple, Rain/Blue, and Misery/Green) are not normal in humans compared to the other three (Guy/Red, Diablo/Black, and Carrera/Yellow).
343* WorthlessYellowRocks: In the eight episode of ''Slime Diaries'', Rimuru is excited that the others found matsutake mushrooms, which are quite rare in Japan. However, Rigur and Benimaru explain that the mushrooms are quite common in the Jura Forest, and they just happened to collect some while foraging.
344* {{Wutai}}: The nation of Tempest itself, naturally, but the Ogre Village before its destruction and the {{Tengu}} Village also have this aesthetic. {{Justified|Trope}} as they were all influenced heavily by [[TrappedInAnotherWorld Otherworlders]] from Japan, with Rimuru admitting many of his cultural developments have been because he wants to keep Japanese culture alive and well to avoid homesickness. Fellow Japanese Otherworlders like Yuuki and Hinata certainly don't complain that they have reliable access to things they love like manga and cuisine respectively when they once thought they would only ever be memories.
345* YourDaysAreNumbered: Once a Summon (a person yanked from the different world by magic) fails to develop a skill that allows them to deal with the enormous level of magicules acquired during the ritual — [[WeHaveReserves which is a common, and even a normal occurrence]] — [[PhlebotinumOverdose their bodies fail within several years]]. This is especially the case for anyone summoned when still immature, i.e. children [[spoiler:which is why Leon bound Ifrit to Shizu, as that would prevent the phenomenon from occurring for decades]].
346[[/folder]]

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