YMMV / Legacy of the Dragonborn

• Arc Fatigue:
  • In the LE version of Legacy and earlier versions of the SE version, the quest Shattered Legacy - while you'd expect that a quest about reforging the Amulet of Kings would be a long one, this one is particularly long, since you're required to complete the main quest of the Dragonborn DLC, as well as that DLC's Lost Legacy side quest, in order to get the full Visage of the Dragonborn armor. In V5 of the SE version, however, the components of the armor were changed^note Tiber Septim's representation is now his helm instead of his armor, eliminating the need to complete Dragonborn, with Morihaus instead being represented through The Lord's Mail; also, the Moon and Star was replaced with the Ring of Zurin Arctus, so it's much easier.
  • On the flipside, the research stations became this somewhat - the first station originally required the completion of "Under Saarthal", but V5 changed it so that the entire College of Winterhold questline needs to be completed. Fortunately, the second and third stations have much shorter requirements (completion of "No One Escapes Cidhna Mine" and "Forbidden Legend", respectively).
• Game-Breaker:
  • In the SE version, the Visage of the Dragonborn is a standard Infinity +1 Sword, with each part granting bonuses depending on how many other parts of the set are worn. The Ring of Zurin Arctus has a notable "All or nothing" one^note meaning you have to wear all parts of the armor allows you to give items an extra enchantment - and it stacks if you have the enchanting perk that allows you to give an item two enchantments, meaning you can give any enchantable item 3 enchantments.
  • The Sell Pile, where you can dump all of your unneeded items and let them be sold automatically. While the most you can receive for your goods is 50% of the standard price and it doesn't level your Speech in the process, this completely eliminates the biggest problem of Skyrim's other massive-money-via-crafting Game Breakers - There's no upper limit on how much you can sell at a time, and no need to travel, which can let you make tens or hundreds of thousands of gold after a particularly intense crafting session.
  • While it is not enabled by default (and has to be switched on in the mod menu), the Stash Supplies spell renders your carry capacity functionally limitless, with a powerful auto-sorting supply chest available on demand. The only thing stopping someone from taking everything in a dungeon is the player's patience and adherence to the spirit of the game.
• Good Bad Bugs:
  • Not so much good but hilarious - in some versions of V5, if you sided with the Dark Brotherhood, you'd find Goldbrand in the Katariah, whereas destroying them would get you Eltonbrand from a messenger^note if you had the Tournament of the Ten Bloods mod, you'd get Shadowrend from both instead; and if you had the Shadowrend creation installed and also the aformentioned mod, you would get an entirely new weapon if you had the creation club patch for LOTD installed, but due to a glitch, there was a chance it would instead act as if you had opted to destroy the Dark Brotherhood, even if you had joined them. Meaning you'd have a messenger telling you the Emperor had sent you thanks for stopping an attempt on his life, even as you're in the process of planning said attempt/having carried out that attempt^note in case you're curious, if you opted to side with the Dark Brotherhood, you'd find Goldbrand in the room where the Emperor is found in the final quest, and it can be displayed in the same place Eltonbrand is displayed in; in the Ten Bloods mod, Eltonbrand and Goldbrand are interchangable.
  • When you reach a new 50-artifact-milestone, Auryen will seek you out if you're in the museum to give you an item. This can happen when you're in the Hall of Secrets, an area that he explicitly states he would not go to. While he has no reaction to the highly questionable things you may have down there, it can be a bit of a panic / laugh inducing jump to have him catch you in your Creepy Basement.
• Scrappy Mechanic:
  • The way the Shattered Legacy quest is triggered makes it unlikely to start by a new player. Once the Dragonborn visists the museum after it has at least 550 pieces, Auryen gives them the Sword of Ancient Tongues. This triggers an event where Byron spawns next to Whiterun Stables (in another city relatively far away from Solitude, where the museum is), then has to catch up with the Dragonborn, and the quest actually appears in the journal once he does. The game actually makes him travelling through the map on foot in real time, which makes the encounter rather unlikely if the Dragonborn travels constantly through the whole world, especially if using fast travel often.
  • If one wishes to get the full abilities of the Visage of the Dragonborn, they must have all eight pieces of equipment equipped. This causes issues any two-handed weapon or bows, as the shield cannot be equipped in this state. This means you have to either carry around an extra weapon, or you have to sacrifice the full buff set in return for using a Two Handed Weapon.
• Sidetracked By The Golden Saucer: Although the mod itself acts as this to the main game, it turns this up to eleven - it's entirely possible to forget about guild explorations or finding weapons and instead focus on tracking down unique gemstones, seashells, and/or paintings for the museum.
• That One Sidequest:
  • The fossil room of the museum. Unlike the other parts of the Gallery of Natural Science, where you can either find the items at set locations, or the components for making the buildable exhibits are easy to find^note the most difficult are the scales for the named dragons, but as those are from fixed locations, they are at least easy to find if you know where they are, you can only get fossils from mining ore veins - and the chances of getting them are completely random.
  • Finding seashells and unique gemstones, because of just how many there are. The paintings are easier, since you can buy them from merchants (not to mention that the paintings just require a painting scroll to be displayed), but the seashells and gemstones don't have fixed locations. The Gemstone one can be somewhat mitigated by obtaining the Crown of Barenziah (Obtained by completing That One Sidequest from the vanilla Thieves Guild) and through the Ore/Gem orders via your House Manager, but for the seashells there's nothing for it but to go beachcombing - Merrian's Spyglass at least helps out with that.
  • Even when the player knows of the spawn location of the Phantasmal Chest, waiting for it to appear can be torturous if they don't want to just take the chance of stumbling across it. It relocates on the map to one of 30 locations at random every 24 hours, which turns the process of finding it into an agonising Luck-Based Mission, requiring the player to wait at a location for an average of an ingame month for the chest to spawn.