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Gather children, listen well, harken to the Under Tale.
A story of a small child, falling into a massive cavern where monsters have made their home. With the help of a certain phantom, the child makes their way through the Underground, making friends & family along the way.
I own absolutely nothing in this. Undertale, along with with characters, setting, etc., belong to its respective owners, who are not me.
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Drunk On Power (And Ketchup) by Cat_On_A_Keyboard, Chill_Phil
Fandoms: Undertale (Video Game)
17 May 2025
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Frisk has been trapped in the same loop for longer than they care to track. They can now consistently break the barrier or get to 20 LV without taking any damage. After getting to Snowdin (again), Frisk decides to try something different.
Proofreading by Chill_Phil
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With rent steadily increasing, you felt like you couldn’t keep up. You didn’t know what to do, you couldn’t ask your family for help, and you were already working two jobs AND studying. You vented to your friend of six months about how all hope seemed lost.
That’s when he offered you a chance to live with him and his cousins until you get back on your feet. “You’d Be A Wonderful Addition,” he said. “Everyone Would Love You!” he said…
So, having no other alternative, you accepted.
What your dear friend failed to explain was just how many of his cousins there were, or how similar some of them look to each other. Albeit weird, it was either this or struggling, so you picked the former.
You hoped this wouldn’t be something you’d regret.
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Behind the scenes of the tech industry isn't always as luxurious as you may think. As a freelance beta tester of whatever people throw your way, it's more dull than you can put into words. But with your newest job, you're given something pretty cool to play around with: a vr headset that's whole purpose is to make and interact with AIs. You know they aren't actually thinking and feeling people and yet you can’t seem stop forgetting that. Sans becoming more life like with each growing day really doesn't help.
When do you draw the line between emulation and reality?
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What happens when the ones in charge of keeping the scales of the universe balanced have been placed in endless loops to the point that their 'unyielding' justice crumbles with their mental state?
What happens when the ones in charge of balancing the scales tamper with them in their desperation?
What will the universe do to keep the balance?
(Note in Hiatus on chapter 10) -
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Vox, the demon of technology, he's made of it, he uses it, he controls it.
What will happen if he would happen to get into a place where there isn't much of advanced technology to speak of, his greatest weapon and support?Unfortunately for him, that's exactly what happens.
Or, Vox gets thrown into undertale and after interacting with a few monsters, he decides that it would probably be incredibly easy to take control of the underground and it's inhabitants.
(DISCONTINUED)
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Esta es una versión propia de Underfell en la que tan solo se respeta el concepto de "Matar o morir" que posee el universo original.
Esto abarcará ciertas cosas: ¿Qué son los seguidores de Gaster?
La llegada de los hermanos esqueleto al subsuelo
¿Cuales fueron los motivos de Frisk para caer en el monte EBOTT aún siendo consciente de las leyendas que se relataban?
Chara y Asriel... ¿Por que acabaron de esta forma?, entre más misterios junto con el origen de la ley de matar o morir.
Series
- Part 1 of Underfell (Un verdadero infierno)
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Leporiphobia by Cat_On_A_Keyboard, LittleChara913
Fandoms: Undertale (Video Game), Deltarune (Video Game)
17 Apr 2024
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Summary
Kris wraps his partners up in an Easter prank on the school! What could go wrong?
Series
- Part 3 of Our Little Monsters AU/SolarTale
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Undertale : Endtimes by FunkyFreshDudeMan
Fandoms: Undertale (Video Game), Horrortale - Fandom
03 Mar 2024
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The monsters have struggled a fought for a very long time but they eventually make it to the surface. However, they find a world fallen to an infectious disease that turns those it comes into contact with into starving husks. Things get worse when a temporary rip in reality allows part of the void to seep into the time line causing the infected to mutate into something much worse. The mutation wasn't the only thing to leave the void, however.... Perhaps things will be okay one day.
This is gonna be a very self-indulgent Au with an OC that may or may not be a self insert! This AU is also based off horrortale and takes inspiration from a lot of popular zombie media! I'm also not the best writer so we will see how this goes!
- Language:
- English
- Words:
- 1,074
- Chapters:
- 1/?
- Kudos:
- 1
- Hits:
- 28
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Summary
That kid is hurting you. Y-you didn't mean to kill him. Why are they dragging you? What are they doing to you? Why do you have to kill people?
Series
- Part 7 of Swaps, Shifts, and Mixes
- Part 6 of Frisk's AUs
- Part 7 of shed-verse
- Part 50 of Two Steps To The Left, And a Long Fall
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Prompt: Can you write a multi-chapter Undertale fanfiction?
ChatGPT: Sure! Here's Chapter One of an Undertale fanfiction: -
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Derringer is the queen's Enforcer, but not by choice; the Underground is underneath a tyrant's thumb and no one seems to be able to defy her except him... and even then it has led to his personal suffering as he tries his best to stay between the tyrant and the innocent monsters she wants to dust for her own amusement or stupid whims. He knows that he cannot keep up this forever and his brother, second to Captain Alphys of the Royal Guard, could be left on his own if ever the tyrant had reason to dust him. One day, while on his way back from the usual day in court, he comes upon a strange monster in need of help ...
Series
- Part 2 of Fellswitch: Fate
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Mostly a excuse for silly genocide jokes, but the story can still get pretty brutal.
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Гастер был… очень странным монстром. В каждом из своих соотечественников он видел чуть ли не безграничный потенциал: от Фроггита, способного лишь на выпускание мушек, до маленькой ящерки, помешанной на японской анимации. Он говорил, что к любому живому существу можно найти подход. Может, поэтому на него работает так много монстров. И Боб – один из Темми, тоже работал на загадочного учёного по кличке Джи.
- Language:
- Русский
- Words:
- 595
- Chapters:
- 1/1
- Hits:
- 11
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Going on a camping trip with your family wasn’t your all time favorite thing to do on the weekend, but it didn’t mean you didn’t try to enjoy it. You could understand where they were coming from, you did need to spend more time with them, your dear sibling tries to help you as well. Apparently they thought going near a mountain that is pretty much labeled “Cursed” and “Dangerous” was a good idea.
MT. EBOTT, the legendary mountain that is said to eat up every human and being that dares to walk on it.
You wonder what that all is about, your mom used to tell you it was all just some stories to make children of the village afraid, to make sure they wouldn’t go get lost around the mountain all alone. You kind of believed her, but you also believed in the monster history books that you read online from that one weird site… for whatever reason. So now you have to check some things out for yourself.
Series
- Part 1 of SOULS
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You know that dancing mushroom in the Temmie village that tells you whether or not you’ve spoiled your soul yet? This story is about that guy. Oh, and it’s a genocide run, so that should be fun. If you’re intrigued, you better read!
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Monsters & Magic: Biology, History, and Basically a Guide to Monsters and Stuff in General. by - Scrap - Paper - (multivers4l_m0r0n), Ace with a Gun (multivers4l_m0r0n), multivers4l_m0r0n
Fandoms: Undertale (Video Game)
20 Aug 2022
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Everyone you need to know about the Monster race in my AU! :D
I just added ‘kinda-logic(?)’ to Undertale, basically.also, i have decided to become a school textbook just because.
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You did not mean to kill him. But you did. And now... what can you do?
Series
- Part 6 of Swaps, Shifts, and Mixes
- Part 46 of Two Steps To The Left, And a Long Fall
- Part 3 of shed-verse
- Part 5 of Frisk's AUs
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The Disapppearance of Kris and Susie by PersonWhoExists50306
Fandoms: Deltarune (Video Game)
31 May 2021
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Summary
AU where Kris and Susie are locked in the unused classroom by means that are not in any way paranormal, and they're stuck in there.
Also has a really dumb plot twist to justify why it took so long to find them.
This originally referred to Kris with he/him pronouns. I've corrected this mostly, but I still found a few instances. Tell me if you find one.
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UnderXros: An Undertale AU by SlashBlasterZone
Fandoms: Undertale (Video Game), UnderXros (Fandom)
24 Feb 2021
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So um… I’m doing this because I want to and I got a fifth follower on Twitter. This is for her. Plus I keep thinking up AU’s and I’m not doing anything with them so I made a reward for myself. I make an undertale AU fanfic every five followers on Twitter (granted I might do one regardless if I’m motivated enough). *WARNING this AU HAS ZERO RELATION TO XTALE, UNDERVERSE, OR UNDERCROSS*. This a role change based AU. I’ll put a link to my Twitter in the End Notes of every chapter.
Series
- Part 1 of Twitter follower reward undertale AU’s
- Language:
- English
- Words:
- 41
- Chapters:
- 1/?
- Kudos:
- 1
- Hits:
- 65