1 - 20 of 64,833 Works in Undertale (Video Game)
Navigation
Listing Works
-
Welcome to the Underground by Sparklepool101
Fandoms: Deltarune (Video Game), Undertale (Video Game)
26 Jul 2026
Tags
Summary
Noelle opens her eyes, after hoping that they had closed forever. Instead of a watery grave, she see a small patch of sky, miles away, surrounded by flowers. The ground is soft, her hair is dry, and Kris is leaning next to her, looking more alive then they have since...
Since Cyber City.
Now she and Kris, the real Kris, are stuck beneath the earth in a place that is almost home but not quite, with familiar strangers and more questions than answers.
----Alternatively, after the Chapter Five Weird Route, Noelle and Kris wind up in the Underground and get to make their way through Undertale. How fun! Surely this will have no consequences on their already fragile mental stability!
[Title SUPER subject to change, I just couldn't resist lol]
-
AN INTERESTING COINCIDENCE by RennieTheDinosaur
Fandoms: Undertale (Video Game), Deltarune (Video Game)
26 Jul 2026
Tags
Summary
“i– you – you’re not supposed to be here.”
“I’M NOT?”
Papyrus knew that. How did Sans know that?
OR:
Sans and Papyrus left the world of Deltarune. One might be hiding something to do with how they got there.
...The other may have been doing the same thing, but that's neither here nor there.
- Language:
- English
- Words:
- 1,042
- Chapters:
- 1/1
- Hits:
- 0
-
The Things that Exist Beyond Your Senses by CentipedeLightning
Fandoms: Undertale (Video Game)
27 Jul 2026
Tags
Summary
A strange skeleton walks through your door asking a for a job as your personal guard. You loathe to admit he'd be of great use for your plans.
AND
The pieces of the chessboard are constantly moving. The political landscape of Faerie is starting to infect the mortal world and a manor in the Ebott mountains is about to be caught in the middle.
- Language:
- English
- Words:
- 5,721
- Chapters:
- 1/?
- Hits:
- 0
-
Tags
Summary
Frisk tries to reset to truly save the monsters of the underground - but due to Flowey running things with his vines right in the monster king's chest - things don't go as planned.
And thus, Frisk resets in a attempt to save them - and bond with others more, redoing what they thought is the end to prevent the monster king's demise.
Was it the best plan . . .?
Well, no - considering how that wasn't nessecary at all. But why would Flowey tell them that? This kid was interesting enough WITHOUT his intervention. Him saying anything would ruin the fun, no?
Though things end up going wrong.
Horribly wrong, right from the start.
- Language:
- English
- Words:
- 513
- Chapters:
- 1/2
- Hits:
- 0
-
Niflheim’s List of Fiction Ideas by 07creeper26
Fandoms: Undertale (Video Game), Henry Stickmin Series (Video Games), Naruto (Anime & Manga), Elder Scrolls V: Skyrim, The Backrooms - Anonymous on /x/, Pocket Monsters | Pokemon - All Media Types, 盾の勇者の成り上がり - アネコユサギ | Tate no Yuusha no Nariagari | The Rising of the Shield Hero - Aneko Yusagi
26 Jul 2026
Tags
Summary
Just some fiction ideas. I decided to put them out there because I know I can’t be consistent with regular updates and will likely stop writing. You can use an idea as long as I get credit for the idea (if you got it from here). That’s it.
-
Tags
Summary
Just a bunch of silly, fluffy one-shots featuring Sans and Papyrus being their best brotherly selves.
Series
- Part 11 of Skeletwins Side Stories
-
Consequence by Anthrax13
Fandoms: Deltarune (Video Game), Undertale Yellow (Master Sword Video Game), Deltarune Yellow - Fandom
26 Jul 2026
Tags
Summary
An Angel scorned, with tears of fire;
The bitter path, of thorny mire.
All countdown to the Earth's expire.A soul of Justice; borne true and bright.
One of Compassion; with monstrous might.
Usurped from deepest, darkest black;
A Prince of hollows, bearing lack.Two Hearts;
Two Ends.
They play their parts,
In rage-wrought bends.
From burning vengeance, a twisted boon;
Faux transcendance, of DELTARUNE. -
Tags
Summary
Nightmare knew he was not the best in the Multiverse.
Hell, he was not even good.
He was the God of Negativity, a title that followed him like a curse carved into his very bones, and it made perfect sense that someone like him would end up completely alone.
Or: Nightmare is lonely so he ends up recruiting Killer, Dust and Horror all based on misunderstandings.
With fanart!
Series
- Part 3 of Undertale AU's
-
Tags
Summary
You've fallen down from the surface and landed in the underground, gravely injured.
Now addled by memory loss, a large goat monster takes you under their wing.TWs in tags
-
Tags
Summary
Cash is the newest addition to the Papyri on the surface. All the Papyri apparently live in one big house together, instead of woth their brothers. Though it isn't mandatory, Cash decides to check it out.
This is an anthology of what goes on in that house.Series
- Part 43 of F/P/S-Cest
-
Interference by EpicDarkner_Catbull
Fandoms: Deltarune (Video Game), Undertale (Video Game)
26 Jul 2026
Tags
Summary
Error and Ink travel to Deltarune out of curiosity, but it's kinda weird.
(This is my first work with Undertale AUs, please dm if anything is wrong lol)
-
Tags
Summary
A Deltarune alternative universe where the player soul is a monster that curses it's victims and wants to kill them, motive explained in story, Susie Kris and Ralsei have the goal of trying to destroy all the fountains and Kill the Angel (The soul) to free Kris and Susie from the curse
- Language:
- English
- Words:
- 990
- Chapters:
- 1/1
- Comments:
- 1
- Hits:
- 14
-
The ABC’s of Intimacy by SinMama
Fandoms: Undertale (Video Game), Invader Zim, Villainous (Cartoon), SCP Foundation, Styx: Master of Shadows, Of Orcs and Men, Gravity Falls, Fallout (Video Games), Five Nights at Freddy's, Rick and Morty, Bendy and the Ink Machine, Ben 10 Series, Warhammer 40.000, Danny Phantom, Silent Hill (Video Game Series), Borderlands (Video Games), Hellboy (Comics), Serious Sam (Video Games), Destroy All Humans! (Video Game), Helluva Boss (Web Series), ULTRAKILL (Video Game)
26 Jul 2026
Tags
Summary
[Due to tag limit, your favourite character may or may not be in this, best check the tag index, if not, why not give a request?]
An A-Z list of things that’ll be talked about as informative information on the sexual intimacy of characters.
Curious how a character may be in bed? Come here to request a character you’re curious about or just see all the other characters I already have written.
See how your favourite character is during intimate moments and more! If you're looking for something fluffier, check out the ABC’s of Lovers. If you're looking to request something specific like a oneshot/smut/fluff, check out SinMama’s Collection of Smuts and Oneshots.
Series
- Part 1 of ABC’s of Everything
-
Making A Monster by absurdmagewrites
Fandoms: Undertale (Video Game), Underfell-fandom, Underswap-Fandom, Swapfell-Fandom, Fellswap-Fandom, Fellswap Gold-Fandom, Horrortale-fandom, Crafttale-Fandom, Seaswap-Fandom
26 Jul 2026
Tags
Summary
Sometimes life throws you a curveball. For you, your curveball was going to bed looking like a human, and waking up looking like a monster.
A skeleton monster to be precise.
With the barrier breaking, a large surge of magic descended on the town you live in, and transformed you overnight. Unsure what to do with you, and the others changed, you're ushered into a facility until a monster with similar magic can take you to teach you how to wield the now uncontrollable magic you've been given. After waiting in this place for four years, you'd given up hope that anyone would ever want to take you.
What a surprise for you when you find out that someone does. A lot of someones.
-
You Can Always Come Home by Polysterene
Fandoms: Deltarune (Video Game), Undertale (Video Game)
26 Jul 2026
Tags
Summary
When Dess Holiday dissapeared from hometown five years ago, everyone had their own theories as to what happened. The simple truth however is that she ran away from home.
Now a university student in Ebott City, Dess has built a life far away from the place she left behind. She tells herself she’s moved on. That she doesn’t need Hometown, and Hometown doesn’t need her. Then a change in her university schedule puts her in the same classroom as someone she thought she’d never see again.
Suddenly, the past she’s spent four years avoiding is sitting right beside her, and keeping her secret becomes harder with every passing day. But guilt has a way of catching up with you, and eventually Dess has to face the people she left behind
As it turns out, You Can Always Come Home
-
An Unchangeable Loss by lapisplayer21
Fandoms: Undertale (Video Game), Deltarune (Video Game)
27 Jul 2026
Tags
Summary
Despite the different circumstances, some things never change. Noelle and Michael still find themselves coming to terms with the loss of a mentor.
Series
- Part 3 of The Henrikson Saga
- Language:
- English
- Words:
- 1,628
- Chapters:
- 1/1
- Hits:
- 5
-
Tags
Summary
Week 2 Prompt for Skumhuu's Mermay 2026
Series
- Part 5 of It's Always Mermay in my Heart
- Language:
- English
- Words:
- 481
- Chapters:
- 1/1
- Kudos:
- 1
- Hits:
- 8
-
Tags
Summary
✨
He skidded to an unsteady halt as he finally got a close look at the two passed out Skeletons.“What the fuck?”
Blue didn’t swear often, but this? This definitely merited it.
✨Error and Ink are caught in a …little… accident and now everyone else is left to deal with the aftermath.
{{I try and Update Every Sunday :>}}
Series
-
Tags
Summary
WANNA...
PARTICIPATE? -
A Guide to Babysitting a Multiverse Full of Idiots by Innkyblot_01
Fandoms: Undertale (Video Game), Undertale (Multiverse)
26 Jul 2026
Tags
Summary
The balance is acknowledged. The war has ended. Recovery and peace are slowly healing the multiverse. What now?
The Creators don’t know. Will they approve? Do they want the war?
Are Multiverses boring without the bloodshed?
Nightmare doesn’t know. He’s too tired for this.
Series