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1. Public Bookmark 71

   Gloom & Doom Extended Universe by TrashCollector

   Fandom Undertale, Undertale (Video Game)

   • Explicit
   • Creator Chose Not To Use Archive Warnings
   • F/M, Multi, Other
   • Series in Progress

   24 Oct 2025

   • Creator Chose Not To Use Archive Warnings
   • Sans (Undertale)/Reader
   • Dust!Sans/Reader
   • Nightmare!Sans/Reader
   • horror!sans/reader
   • you/Sans
   • Sans(Horrortale)/Reader
   • Reader
   • You
   • Dream!Sans
   • Nightmare!sans
   • Horrortale!Sans
   • Dusttale!Sans
   • Killer!Sans - Character
   • Geno!Sans
   • swap!sans
   • swap!papyrus
   • Cross (Xtale!Sans)
   • Alternate Universe - Horrortale (Undertale)
   • Alternate Universe - Dusttale (Undertale)
   • Alternate Universe - Killertale (Undertale)
   • Alternate Universe - Dreamtale (Undertale)
   • What-If
   • Drabble
   • Deleted Scenes
   • Reader-Insert
   • Slow Burn
   • Domestic Fluff
   • Slice of Life
   • But Also!
   • Drama
   • Action
   • AU prejudice
   • maybe not so bad
   • evil sans
   • Reader Just Wants To Help
   • reader is bad at helping
   • Gratuitous Swearing
   • Alternate Universe
   • Home Universe is Undertale
   • more tags as I think of them
   • Monsters on the Surface
   • skeletons keep showing up in your living room
   • you should probably do something about that
   • Sans is a gremlin
   • EVERY Sans is a gremlin
   • no exceptions
   • Bad guys
   • Reverse Harem

   Words:

   108,526

   Works:

   2

   Bookmarks:

   71

   Bookmarked by eclipsaffected

   17 Jul 2023