History ApocalypseHow / ClassX3

* ''VideoGame/{{Stellaris}}'' has this as a possible outcome when dealing with an entity known as "[[EldritchAbomination The End of the Cycle]]". When it offers to bring you into a covenant, accepting the offer (which the game advises ''against'' with a tooltip that reads "'''''[[SchmuckBait DO NOT DO THIS!]]'''''"), you gain a +100% buff to Resource Output and Navy Capacity for the next fifty years. Once those fifty years have passed, however, ''the Reckoning begins.'' [[spoiler:Every ship in your fleet is destroy, every megastructure scrapped, every planet depopulated and rendered uninhabitable, and every leader killed except for one IgnoredExpert who had the forethought to know this was a bad idea and escape with a handful of like-minded individuals to a small colony far away from your now-destroyed empire. Worse still, the souls of the citizens in your empire whom you damned by entering into the covenant form a massive fleet with a Military Power level in excess of ''one million'' that will proceed to spread throughout the galaxy and start expunging all life, [[ControllableHelplessness leaving your puny colony for last]] [[ForcedToWatch as you watch the galaxy die, knowing it's all your fault.]] Even in the unlikely event that this unholy fleet of destruction is routed and the galaxy is spared from total oblivion, you will be stuck with a permanent -1000 Opinion modifier debuff: any empires still left standing will, in all likelihood, want to take revenge on you.]]

* Mathematician Roger Penrose dreamed up the "Thunderbolt" or "[[NamesToRunAwayFromReallyFast wave of death]]" (technically, [[TechnoBabble a gravitational plane wave exhibiting a strong nonscalar null curvature singularity]]), a particular kind of gravitational phenomenon which propagates at the speed of light (so you'll never see it coming) and effectively destroys spacetime itself in a narrow volume of space from where it started to the cosmic horizon 47 billion lightyears away, conceivably spaghettifying entire galaxies in the process without warning. Apparently a collapsing Black Hole could [[NightmareFuel conceivably generate such a thing]].

* The Zerg in ''VideoGame/StarCraft'' kill or "infest" billions of other lifeforms throughout the Terran Dominion.

-> Upon its entering the exo wormhole we detected the single strongest energy pulse on record. [...] The Blade is gone, as is the planet it entered from, and apparently whatever the AI was drawing from on the other side. To be honest, I'm not entirely sure the ''galaxy'' on the other side is still there.

Galactic-scale hysical annihilation. Via some means, ''billions'' of stars, nebulae, pulsars, and so forth, along with the super-massive galactic-core black holes at their centre are utterly destroyed.

->''"The Master and the other Time Lords watched helpless as the beam hit the nearest galaxy. The galaxy convulsed. Every star in it burst open and swirled into the center, to be consumed by the black hole at its heart. Across myriad worlds, beings of all shapes and sizes, from spear-wielding primitives to civilizations spanning a thousand star systems stared up at the heavens in the grip of mortal terror as the torrent of fiery doom raced toward them and annihilated everything they had ever known. People, families, homes, cities, cultures, biomes, continents, planets, and empires of every conceivable design and history were lost to the searing plasma in the blink of an eye.''

->''A billion life-supporting worlds and a hundred thousand space-faring civilizations were burned out of existence, then ceased to have ever been as the destruction spread back through history. The galaxy was utterly annihilated from space and time, a billion trillion lives destroyed."''
-->-- ''Fanfic/TheLastGreatTimeWar''

Galactic-scale Physical Annihilation. Via some means, ''billions'' of stars, nebulae, pulsars, and so forth, along with the super-massive galactic-core black hole(s) at its center are destroyed. Utterly.

** Going further, Vegito averted the destruction of the barriers between dimensions, which presumably would have destroyed all reality.

Galactic-scale Physical Annihilation. Via some means, ''billions'' of stars, nebulae, pulsars, and so forth, along with the super-massive galactic-core Black Hole(s) at its center are destroyed. Utterly.

[[folder:Films]]

* ''Series/{{Farscape}}: The Peacekeeper Wars'' - At the climax of the show, John Crichton unleashes a wormhole weapon which will "eat the galaxy" unless the warring sides make nice. Having spent four years desperately warning people that it's not a good idea to have them he finally builds one and goes on to prove his point by creating a weapon that swallows a planet, two entire battlefleets and doubles in size every fifteen seconds or so, and will never, ever stop growing. Even MagnificentBastard, and sometimes OmnicidalManiac (towards the Scarrans at least) Scorpius admits that this weapon is madness.

* [[spoiler:Darth Traya's]] ultimate plan from the ''VideoGame/KnightsOfTheOldRepublic'' video game is to use the Exile's death to create a wound in the Force that will spread outward, echoing across the galaxy and deafening all those touched by the Force until nothing is left behind in its wake but empty planets with no life on them as a part of her RageAgainstTheHeavens ideology.

* Literature/JackChalker's ''Literature/WellWorld'' series had an example. A weapon that not only destroyed anything it hit, but eliminated the energy in the area as well, ripping a hole in reality...and it is spreading.

* Literature/JackLChalker's ''Literature/WellWorld'' series had an example. A weapon that not only destroyed anything it hit, but eliminated the energy in the area as well, ripping a hole in reality...and it is spreading.

** [[BiggerBad Amon]]'s eventual goal is, [[ShroudedInMyth so far as he's saying anything]], to kill every sentient being (possibly ''every living thing'') in an area not smaller than the Koprulu Sector but probably quite a lot larger, with the possibility of physically reshaping the affected areas to suit himself afterwards.

*** ''[[Recap/DoctorWho50thPrequelTheNightOfTheDoctor The Night of the Doctor]]'' implies that it was threatening to reach X-4.

* ''Series/DoctorWho'''s Time War is assumed to be this, with at least five populated planets confirmed to have perished, even if it all went unnoticed for lesser creatures like the humans.
** The Moment, a DoomsdayDevice which the War Doctor stole to ''end'' the Time War, is explicitly described as a "galaxy-eater".
** ''[[Recap/DoctorWho50thPrequelTheNightOfTheDoctor The Night of the Doctor]]'' implies that it was threatening to reach X-4.
** In the episode ''[[Recap/DoctorWhoS33E12NightmareInSilver Nightmare in Silver]]'', it is revealed that in order to eradicate the Cybermen once and for all an entire galaxy was destroyed, including all its inhabitants.

->''The Master and the other Time Lords watched helpless as the beam hit the nearest galaxy. The galaxy convulsed. Every star in it burst open and swirled into the center, to be consumed by the black hole at its heart. Across myriad worlds, beings of all shapes and sizes, from spear-wielding primitives to civilizations spanning a thousand star systems stared up at the heavens in the grip of mortal terror as the torrent of fiery doom raced toward them and annihilated everything they had ever known. People, families, homes, cities, cultures, biomes, continents, planets, and empires of every conceivable design and history were lost to the searing plasma in the blink of an eye.''

->''A billion life-supporting worlds and a hundred thousand space-faring civilizations were burned out of existence, then ceased to have ever been as the destruction spread back through history. The galaxy was utterly annihilated from space and time, a billion trillion lives destroyed.''

* In ''TabletopGame/Traveller'':

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* ''TotalAnnihilation'' is set at the end of a war that's essentially a galaxy-wide Class 2, with examples of everything else on the scale. The ''Core Contingency'' ExpansionPack one-ups this with the Core faction's master plan of ''destroying the entire galaxy'' except for one Core Commander, who would then rebuild the Core civilisation. Then in ''VideoGame/SupremeCommander'', two of the three factions are trying to use a superweapon capable of doing this on their opponents. The [[LaResistance Cybran]] plan (which is the canon ending, or the closest thing to it) is to just disrupt the Quantum Gate network so they'll be left alone, but this inadvertently unleashes an alien horde bent on carpet nuking everyone that's not them. Basically if you live in a game made by Chris Taylor, sooner or later you're gonna get exploded.

* The backstory in ''VideoGame/EveOnline'' states that the initial wormhole to Earth collapsed after thousands of star systems in New Eden were colonized, leaving every star system stranded without resources for millenia, inducing a technological erosion back to medieval times, where each racial empire had to "rediscover" science and technology over thousands of years of isolation.

* In Larry Niven's ''Literature/KnownSpace'' series, Beowulf Shaeffer flies to the centre of the galaxy, until he sees that since stars in the core are so close together, one of them going supernova set off a chain reaction causing the entire galactic core to explode, and our part of the galaxy will be destroyed in some 25,000 years when the explosion reaches us. When he returns and tells the Puppeteers, they pack up their entire civilization and flee immediately. (Which makes sense, since they're taking their homeworld with them, and it won't go faster than light.)

** And in the most recent movie ''[[Anime/DragonBallZBattleOfGods Battle of the Gods]]'', [[PhysicalGod Bills]] is stated to be able to destroy entire Galaxies as well.