1 - 20 of 1,681 Bookmarked Items in Alternate Universe - Horrortale (Undertale)
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What if he never went into the diner that day?
What if you never defended him?
...
You would probably be a lot safer if you hadn't.
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You watch them suggest names and argue with each other as you stand there dutifully like a newly-adopted dog. Rus sidles up close to you and looms over you like a hanging specter. His smile does not look friendly.
“How about..Snowy,” He suggests, his grin widening at the twitching grimace on your face.
How to survive a blizzard and nonconsensual teleportation to a dilapidated sci-fi basement.
- Language:
- English
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- 229,504
- Chapters:
- 12/12
- Comments:
- 348
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- 1,166
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You were finally getting your life back on track. Juggling college courses and a new job, you were slowly but surely rebuilding from the ground up, convinced the worst was behind you. That all changes when a magical summons you can't refuse rips you from your world and drops you into a house filled with powerful, skeletal monsters who despise you before you’ve even said a word.
To them, you are the arrogant and careless human who shattered the soul of their dearest friend, the gentle mage Lyra. They see you not as a person, but as a living tool—a magical "key" they require to heal the damage you supposedly caused. Trapped in a multiversal nexus with no way home, you must navigate a gauntlet of relentless animosity and suspicion.
Every word you say is twisted, every action is judged through the lens of lies you don't even know have been told. How can you survive in a home that isn't a home, surrounded by enemies who believe they are the heroes? And how can you prove your innocence when the true manipulator is the very person they've sworn to protect?
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Bookmark Notes:
Reader gets experimented
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Bookmark Notes:
Hmmm I don't know how to feel butttt great writing made me cry. chp19
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How to Bloom by Sarah_the_Something
Fandoms: Undertale, Horrortale - Fandom, Undertale AU - Fandom, Undertale AUs - Fandom
28 Sep 2021
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Life has been hard, and all you want to do is pay your rent and be safe from the gangs in your neighborhood. You find a gardening job in the newspaper, and you think you'll just get the money and leave. What you didn't expect is to make friends with the two skeletons you're gardening for... and maybe more than friends? Be prepared for angst and fluff, much comfort. DISCLAIMER: the gangs are more like modern mafias.
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You fell into the Underground as a child. You spent a few years there, growing up with the skeleton brothers. Life wasn't great, painful at times, however you had your family with you. A change came to your life, one where you were surrounded by alternates of your skeletons. They were nosey, pushy, and much louder than Papyrus. They were nothing like your skeletons, and you very much didn't approve. You didn't know how to act, you didn't know if you could trust them, didn't know how to trust them.
There were too many factors. Monsters were there that you couldn't be around. But maybe.. some can help you?
Series
- Part 12 of Reader Inserts
- Language:
- English
- Words:
- 48,313
- Chapters:
- 24/24
- Collections:
- 2
- Comments:
- 164
- Kudos:
- 725
- Bookmarks:
- 135
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- 14,213
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You were just walking home. A tear in reality split open underneath your feet and suddenly you were falling.
Falling
FallingThen you fell up and onto the tiled floor of a basement lab.
Now all of a sudden you're in another world and surrounded by 6 strange skeletons (plus one's brother).
Being terrified of all things horror and monsters, what are you to do?*Will contain mature themes but no smut*
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Bookmark Notes:
OOOOOoOooO monster OooOOOo
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96k words ik what im doing tonight
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Living on a homestead was nice. You provided for yourself through hard work, and didn't rely on anybody else. Then your deer gets caught in a trap you didn't set. The neighbors kind of freak you out, but at least Papyrus is a great cook. Also why does Sans stare at you all the time?
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Ch 17
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C 17
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You’ve accidentally ended up on a mysteriously magical island with living skeletons!!
Now if you’d stop cuddling them for five fucking minutes AND BUILD A GODAMN BOAT-
- Language:
- English
- Words:
- 32,570
- Chapters:
- 14/?
- Comments:
- 168
- Kudos:
- 1,165
- Bookmarks:
- 233
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- 23,699
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Latest Chapter: 14
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You had finally gotten to a point where you can consider your roommate Sans as a close friend. You're comfortable where you are, going to school for art and working part-time to split rent.
Yet, just as you're getting used to this system, two new skeletons appear in your shared apartment in the middle of the night. Are they going to go against your system and disrupt your life? What exactly will be changing?Series
- Part 6 of Reader Inserts
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Bookmark Notes:
Ch 15
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Bookmark Notes:
14
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It takes 10 Skeletons, not a village by Donewith_life
Fandoms: Undertale (Video Game), Underfell (alternate universe), Underswap (Alternate Universe), Swapfell purple (Alternate Universe), Horrortale (Alternate Universe)
09 Jun 2026
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You mum drags you to her boring science lab, forcing you to help her with her research, against your will and interest, until late at night. You're in a lab late at night, what could go wrong?
(Reader is 15 so NOT a romance between reader and the skelebois.)
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49
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Something's up with Papyrus and you're going to figure out what.
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The last decade of your life hasn't been so great. The worst part? It's entirely your own fault! The final nail in the coffin is when you're dumped by your boyfriend of a year, and nearly killed by some creep on the same night. You think it's a true miracle when a skeleton monster saves you from an untimely, and possibly gruesome death.
His appearance is frightening, he has a deranged sense of humor, and despite being your savior you're POSITIVE he doesn't like you.
A normal person would want to avoid someone like that, right? It could be the trauma of that night that makes you different. Maybe you're just crazy! It doesn't matter. You want to prove that deep down, a kind part of him still exists.
Don't be fooled. Don't be scared. This is a love story.
(The author is obsessed with the Obsession soundtrack and started writing while listening to it. Yes, the title is a reference.)
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Bookmark Notes:
Ch1
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Go on vacation, they said!
You need to relax a bit more in a nice place, they have said so politely!
Visit an exotic place, they said!
Nothing can go wrong in a ship, they said totally convinced!
You need to meet someone nice and start a relationship, they said worriedly!
And you have listened to them over and over again… Why did you listen to them?
WHY?
Someone, any kind of deity… could somebody tell you just WHY is this happening to you?Why are you lost in what seems like an island lost from the hand of man in the middle of nowhere with weird creatures that seems like monsters that are trying to court you in the most ridiculous ways possible… and why must all of them be fucking skeletons!!!
And why, oh god WHY do you think they’re HOT beauties out of nowhere?
Are you really that lonely or is this island somehow messing up with your mind?-
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You're an engineer who works for Ebott's best research facility in one of the labs; your lifelong dream after finding a journal on Mount Ebott when you were a kid. When you aren't in the lab being smart, you're gathering materials at the abandoned doll factory for the machine you're trying to build.
But one night, you meet a skeleton at the factory. Naturally, you lie about why you're there and say you're there to hunt ghosts. You befriend him and try to find a way to gather the materials while keeping up with that lie. But those lies catch up to you when you start to meet all the other skeletons.
Edit: As of Chapter 29, all chapters have been edited and fixed slightly!
- Language:
- English
- Words:
- 147,343
- Chapters:
- 55/?
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- 1,176
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- 1,977
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- 424
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- 58,354
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A night out with your roommates' sorority sounded like a good way to wind down from exams season, but your good intentions to keep from ruining someone's nice carpet have you end up in the middle of the forest. In the middle of the night. Very, very drunk.
Good thing you found a random house to sidle up to and ask to use their phone. Less of a good thing that the skeleton monster that lives in it is only placated by your sloppy jokes.
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Eventually going to culminate in a "Six Skeletons" sort of set-up, but you don't get off as easy by knowing Classic Sans first.
- Language:
- English
- Words:
- 173,962
- Chapters:
- 37/?
- Comments:
- 2,580
- Kudos:
- 7,180
- Bookmarks:
- 1,633
- Hits:
- 207,948
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You find yourself sleeping in your car in winter. Being strong enough to get out of an abusive cheating relationship, you opt to sleep in your car rather than be stuck in a bad relationship. While you are wracking your brain to find a solution to your situation, you run into an old school friend and her pack of skeletal boyfriends. Your own situation not being the best, you want to avoid stepping into the situation, however one skelly just can’t let you freeze in the cold. What comes next is a story of betrayal, healing, and helping those that haven’t yet learned to help themselves.
Mutt didn’t like the human that the rest of his house has as a datemate, what he didn’t count on was ending up falling for the one person that might be able to help everyone in the skeleton household.
- Language:
- English
- Words:
- 568,406
- Chapters:
- 213/?
- Collections:
- 2
- Comments:
- 2,903
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- 2,132
- Bookmarks:
- 418
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- 120,147
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Bookmark Notes:
chapter 13
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The House Next Door by BattleMaiden13
Fandoms: Undertale (Video Game), Underfell - Fandom, Underswap - Fandom, Swapfell - Fandom, Mafiatale - Fandom, Mafiafell - Fandom, Mafiaswap - Fandom
11 Jun 2026
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The first time you met monsters you manage to run into four of them and literally run into one of those four. Now they are apparently moving in next door with their siblings and you can't seem to imagine a life without monsters. On the plus side they tell horrible jokes and have endless amounts of energy. So what could possibly go wrong.
Part 1) Chapters 1-138
Part 2) Chapters 139 - ???- Language:
- English
- Words:
- 965,685
- Chapters:
- 205/?
- Comments:
- 5,830
- Kudos:
- 8,119
- Bookmarks:
- 1,191
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- 418,531
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On chapter 40
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Who knew that dying would lead to this? Minny didn't, that's for sure. Waking up as a skeleton in the VOID of Undertale was unexpected, but she's read some fanfictions, and has at least an idea of how to expect the unexpected. But first, she had to find out what kind of Multiverse she's in.
Alternative title: I Combined My Favorite Kinds Of Fanfictions Into One Disaster Amalgamation Of A Fanfic
Series
- Part 1 of To be expected? Or to be unexpected?
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[Written for syst3m_of_3rrors]
“Those who ostracize monsters are monsters themselves.”
A kind heart and open ears will get you a long way in life.
Series
- Part 1 of Song of Seas
- Language:
- English
- Words:
- 46,142
- Chapters:
- 33/33
- Comments:
- 431
- Kudos:
- 1,263
- Bookmarks:
- 261
- Hits:
- 36,096
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Sans hates and struggles to live. And therapy isn't working