1 - 20 of 1,529 Works in Alternate Universe - Horrortale (Undertale)
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Meet Grace a young bar owner with secret she holds tight but what happens when she meets a certain skeleton monster with a big 'family' Will her secrets stay hidden or will the world know.
(I am bad at tagging sorry.)
All the aus here are undertale, underfell, underswap, Swapfell purple, Swapfell red, Fellswap gold, Mafiatale, Mafiafell, Mafiaswap, the gaster brothers, horrortale lusttale, and lustfell. -
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To think, it all started because you found a skeleton in the woods. Not the strangest thing you've found, but definitely one of the best.
Sans is just thankful that you were understanding of his situation when you offered him and his 'family' a place to stay.
Do dogs like bones? Of course they do! But you're about to find out just how much a wolf likes bones.
As of Feb 2026, Ch 1-3 have been updated/redone.
Series
- Part 1 of Wolfish Wonder
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You've been friends with the skeletons since they moved in a few months ago. You consider them all to be your friends, best friends even. You decided to invite your twin over to meet them after they moved in with you.
For some reason all the skeletons seem to have fallen for your twin and they ask you for advice. You're fine with it since your twin likes them too!
But then why does it hurt so much?
(rating has been bumped due to one of the jobs the reader has)
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Admirer from afar by VeiledVillanous
Fandoms: Undertale (Video Game), Dreamtale - Fandom
17 Feb 2026
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' Similing to yourself, afterall its not like he could tell you himself afterall he didn't know that the two of you were destined to be together forever, now did he? '
Stalker!Reader x Nightmare Sans.
Looks like your baby left you a little video to watch. I wonder how you'll react to it?
- Language:
- English
- Words:
- 1,849
- Chapters:
- 1/1
- Kudos:
- 9
- Hits:
- 78
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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!
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A Little Honey with that Money by absurdmagewrites
Fandoms: Undertale (Video Game), Swapfell-Fandom, Underswap-Fandom, Underfell-fandom, Fellswap-Fandom, Fellswap Gold-Fandom, Horrortale-fandom
15 Feb 2026
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Stretch, and Money have been best friends from the moment they met. They just understood one another completely, but now are they something more? When a small twist is thrown into their lives, will they be able to cope, and end up happy together, or crash, and burn?
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You and your family are just enjoying a nice day at the park, when a life changing event happens that ruins everything.
You get taken away to a facility to be tested on...
Life doesn't feel as peaceful as it once did, you hated your new life.
"I wish I could just go into those story books I used to read..."
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Doomsday prep has always been necessary in my opinion. If not for your time, then for another's time. So I got married young, to a much older, much richer man, waited a few years for him to die (cancer, so sad), and collected that money like candy at a parade. Then I picked out a nice place for a bunker, and had that thing built in another few years. When Monsters busted out of the mountain nearby, turning some Humans into Monsters, I was only slightly surprised the government's decision was to fucking nuke them all. Now I'm closing the door, and I see people in the distance waving their arms, yelling. I should just close the door, I don't know them, but I don't think it's fair to leave them out to die.
Author's notes, kinda:
Gonna be just Horror, Fell, and Fell/Swap variants.
Characters like Sans, Toriel, Asgore, Frisk, and others are really only mentioned, except Horror Sans.
Papyrus variants are more like different people in this, than variants of the same person.
Also, I don't really like Swapfell Pap (Purple) so sorry, but he might only be there for drama, not for a relationship -
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sans brings home a machine (one that’s already ruined his life more than once, by the way.) it malfunctioned, tore holes through reality, and dragged in his counterparts from places that he shouldn’t have business knowing existed.
so when the machine activates on its own once more, he heaves a sigh and slumps down, mentally kicking the bucket. nothing surprises him anymore; the machine convulses like it always does and he expects another version of him to tumble out. he gets his speech ready and—
oh. it’s a human.
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Cookies, Crystals, and Crazy Skeletons?? by GhostFrog_oOOooOOoO
Fandoms: Undertale (Video Game)
14 Feb 2026
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Life has been going pretty well for you this past year! Work as a club performer has been going very well, your hobbies have been keeping you VERY entertained, and, most important of all, you are enjoying these moments in life with your newly found soulmates! If you had asked yourself a year ago whether you would finally find true love in a couple of humongous, goofball skeleton monsters, you wouldn’t even know what to think. But the past doesn’t matter now. You are finally happy with your two soulmates in a lovely house with your lovely job and friends, nothing could possibly go wrong now!.... That is, until your soulmates' “cousins” show up out of the blue and start causing a ruckus in your perfectly peaceful life. What is all of this about “being concerned about your safety”? Why are your soulmates saying they aren’t to be trusted? Why have they moved themselves into your home temporarily?! And..why does your soul feel weird?
In other words, as you are enjoying your life with your soulmates, Bear and Sugar, their cousins show up one day and, because they don’t trust the Horrortale bros, decide to “watch over” y’all to make sure you are safe. But, is that really necessary?
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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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If you had eternity, how long could you spend it repeating the same few days over and over again?
How long until you gave up? How long until your soul withered away, until all that remained were its tarnished remains?
Frisk has given up. They stand at the precipice of their journey. They distantly recount the many moments of their journey as Asgore awaits them in his throne room. They consider themselves truly lucky to have Flowey by their side. Even if he spends it cursing and spitting at their feet. Frisk wondered, maybe in another lifetime, they could've been family.
(The origin of my Horrorfell AU.)
Series
- Part 1 of HorrorFell
- Language:
- English
- Words:
- 3,212
- Chapters:
- 1/1
- Kudos:
- 2
- Hits:
- 23
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Monsters came out of the mountain last year. An unknown number societies filled with creatures small enough to be held with one or two hands. Without their Core, their Souls need to gain ‘magic’ from Human Souls caring for them. So of course, shops popped up all over the place advertising different ‘varieties’ of ‘Bitties’ for Humans to ‘adopt’.
I’ve seen plenty of these poor little creatures up close and I’m telling you, these are tiny people who deserve more than pet status. Not to mention the fighting rings. There’s intelligence in their eyes that I don’t even see in half the Human people I encounter. Not that I’m particularly interested in encountering people. My street cat Emily and I prefer staying at home, making just enough money off of my video game streaming to stay afloat.
Emily is an odd cat. She came into my life freshly pregnant and demanding to be my cat. Her cool as fuck skeletal pattern gave me the idea to keep my identity online a secret by slapping on skeletal face paint. The viewers love it.
Sadly, Emily gave birth just a few nights ago, to a litter of stillborns. She’s been beyond miserable. She goes out every night now, I’m really worried about her.
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As a broke STEM student, you find your choices for housing whittling down quickly until you have to let your eccentric friend "help" you move into a house filled with skeletons.
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You've heard of undertale, it was a beloved childhood game for you.
From time to time you missed how happy the game made you, but you were an adult now and you didn't have as much time for games as you did when you were younger.
You never expected to meet your favorite characters in person.
(Ya'll I suck at summaries send help 💔)
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Omniverse - Another forgotten one by Drifting with Cross (Underverse_writer)
Fandoms: Undertale (Video Game), UTMV, Undertale Multiverse - Fandom
11 Feb 2026
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Drifter enters another multiverse, expecting another boring tale like the others. After preparing to leave, Drifter is stopped as she notices Ink about to destroy his soul but is prevented by Nightmare. Going against her conscience to not get attached, Drifter is thrown into a unique story of a destined Ink given another chance to live. When she is finally able to interact with the multiverse, she traverses the array of AUs, becoming friends with unique characters.
But the brief escape from her past doesn't last long. As Drifter realizes her past is catching up to her, she is thrown into something bigger than she ever imagined that puts the fate of the multiverse and other multiverses at stake.
ON HIATUS: I am rewriting this fic because I didn't know how to write an actual fic before this. My estimate is for this hiatus to be about 10 months or so. I need to rewrite this and plan this fic out, or else I'll only be writing chapters when motivated and updates will be super infrequent. The first 2 chapters posted here will probably be rewritten as well.
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Same You, Different Font by radskull69
Fandoms: Undertale (Video Game), Deltarune (Video Game)
09 Feb 2026
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Ah yes. The classic ‘’Heather’ convinces the skeletons you’re an evil human so now it’s a EVIL reverse harem’. Right?
Oh? But what’s this? A TWIST?
Sans couldn’t live with himself after what happened to you, going near insane after you’re gone. So behind the others back he uses the machine to undo what he did, except it didn’t. He can still feel his sins crawling on his back.
Oh well, it’ll all be worth it once he has you back in his cold hands again. Screw the other skeletons.
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Stretch has been your best friend since you two were children. Ever since you first introduced yourself to him, he's felt this pull towards you, and you can feel it too. The two of you have been harboring crushes for so long, will either of you ever confess?
Blue didn't really know what the machine in the basement did, it was his late father's old project. When drunken mistake causes this dormant machine to suddenly spit out skeletons who look eerily similar to him and his little brother, how will they deal with their counterparts in a foreign world?
Act 1: Flowers Waiting to Bloom (Chapter 1-20)
Act 2: Fields of Flowers (Chapter 21 - 38)
Act 3: Petals in the Wind (Chapter 39 - 45)Series
- Part 1 of Forget Me Not
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You wake up in an empty room, you can't remember who you are or how you end up here, all you know is that you need to leave this place. Your first encounter being a pair of skeleton brothers that seem both too nice and scary, you wonder what's the deal with this place but does it really matter? the place is full of strange creatures, what would you do?
There's no place for someone like you in a place like this.
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‘What a day!’ Tanya thought as she drove out of the skeleton’s gigantic mansion driveway with her pretty pink corvette.
She didn’t really expect herself to be moving in with an old friend of hers but what was life without uncertainty and surprises? If her ex hadn’t decided to sell all his possessions — including the apartment they lived in to take a spiritual break in the Himalayan mountains she wouldn’t even be here in the first place! Reunited with her old friend!
Or, a rather dumb take on the anti-harem stories.