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Story cover for Aconitum by Schrodingers-Catboy

Aconitum

Schrodingers-Catboy

Reads 270
Votes 68
Parts 36
Time 3 hours, 45 minutes

Reads 270
Votes 68
Parts 36
Time 3 hours, 45 minutes

Schrodingers-Catboy

aus backonmybullshit blue core dream dust gijinka guilt horror humanau ink killer kinda melodrama nightmare selfdestruction sliceoflife trauma undertale

Night should be grateful. He had a purpose. Not everybody can claim that. It just made him bitter. Why did he have to be evil? Why was that his purpose? 

He wanted to change it. His life shouldn't be based around Dreams

(This takes place in the same multiverse as Olenader. You probably don't need to read that first but it most definitely make more sense.

Also they are humanoid, still monsters just look human. Because I find it easier to write that way.)All Rights Reserved

aus backonmybullshit blue core dream dust gijinka guilt horror humanau ink killer kinda melodrama nightmare selfdestruction sliceoflife trauma undertale

Table of contents

36 parts

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Given An Unwanted Second Chance by UndertaleFanatic981

(TW: unaliving thoughts and memories at the beginning. It gets better over time, don't worry! Trauma is difficult to overcome...) You didn't want a second chance. You didn't want to survive. You wanted the sweet release of death. But it seemed like the universe was far too cruel to allow you even that. It took away your memories, your free will to choose whether you live or die...hell, it took the one thing in life you owned! Your own name! And now it seemed like you had to live yet another cruel life, doing things you never wanted done to others. But...at least you could do things your way. Maybe this second chance wouldn't be so bad... (Reincarnated as Nightmare Sans, but unlike other stories, you have no clue what Undertale even is) (WE REACHED NUMBER 1 IN THE UNDERTALE TAG YOOOOOOOO) (9/13/25)

Break the cycle by FKathleen19

The Multiverse for a long time has been an endless loop. Both inside the AUs and in itself. Error and Ink making a truce then breaking it in any possible way. The Dreamtale twins fight until Nightmare dies and Dream sacrifices his soul to plant a new tree of Feelings recreating a cycle. But, among everyone, there is one person who remembers each loop that took place and after a few centuries of trying to figure out what to do, he finally got it. He will break those endless cycles and try to finally give the Multiverse some peace. This is the story of that attempt. Will it work or will it all just be another pointless attempt to change what is meant to be ? ___________________________________________________________________ This story will contain only a small amount of shipping because this is nowhere near of being the main focus, sorry. Of course, none of the characters nor the cover belong to me. They belong to their rightful owner.

Unwanted protection by lisetta888

Everyone knows the Star Sanses: they're the Guardians of the Multiverse, and protect it from Nightmare and his minions, who only want to spread chaos and destruction. They're kind, strong, brave, the good guys! How can you not love them? You can't. They deserve the world. They're perfect and selfless and precious, and must be protected at any (and I do mean ANY) cost. Not that they couldn't protect themselves, of course! It's just, the Multiverse doesn't give them the appreciation and respect they deserve, not really. But Nightmare, Error, Horror, Killer, Dust, Cross... they know how much Dream, Ink and Blue are worth. And they'll keep them safe. Forever. The credit of this story partially belongs to Stargazer_Aldroth, who created a prompt on AO3 and helped me flesh out the story before I started writing. If you're interested, you can check out the comment chain where we discuss ideas for this oneshot and eventual follow-up (for now this story is marked as complete, but I could write other chapters, who knows?) on AO3 from author Stargazer_Nebula "Undertale Writing prompts" (it's the chapter with this same title)

To Kill A Killer by RoseAurum

Nightmare's gang always knew that their job was risky, but they never expected to actually die. Then Killer was killed. Nightmare found a replacement quickly enough, but this new Killer isn't the same as the old one, and the gang are having a hard time adjusting. Inspired by a comic by darkxsoulzyxcaliberx. Something New belongs to rahafwabas. Dusttale belongs to Ask-Dusttale. Dreamtale belongs to Joku. Horrortale belongs to Sour-Apple-Studios. Xtale and Underverse belong to Jakei. Underswap belongs to p0pcornPr1nce/the Undertale AU community. Ink!Sans belongs to Comyet. Any other characters and AUs mentioned belong to their original creators. All art by me. A huge thank you to my partner for beta-reading.

MagicalVerse by Orphaned_Account_V

[A/N: This AU of mine is old. Writing might have changed what I have now. Also I was veryyy young when I started to write that.] Long time ago, Creatures, Humans, ghost, spirits even Monster lived together peacefully. One day, when the new King was in his castle, everything was peaceful. But after 4 months, King was annoyed by Monster and by half creatures. He telled to execute or throw them to the forest. Almost of the half creature were killed. With monster was worse. Almost every monster was killed... After 14 years monsters attacked village. It was a bloody war... Most of those monsters had kids but unfortunately died. Some humans and creatures were dead too. ------------------------------------------------------- Meet the NEW Multiverse! In this Multiverse will have romantic, drama, ships, CANNIBALISM, gore/blood, being an orphan, cursing, panic attacks/anxiety(?) ---------------------- 24/09/25: Because I just saw that someone (a proshipper probably) hacked into my account since 2021 somehow (because I get notifications from comments that year too I didn't even commented) I decided to abandon this account and make another one. ItzViza. It'll take a little time on Friday to get a new account because I'm a little busy-

Ashes to Ashes (Discontinued) by _PizzaPaper_

Cold. Everything was cold. And dark. I was so alone... how could I have wanted this? This couldn't possibly be better than before... the warmth, and the light, and the smiles, however scarce. I cried out. I screamed, but it was muffled. I wanted it back. I wanted everything back. I regretted my decisions, my plans, my dreams. I wanted a second chance. **Reborn as a ??? Sans** !!READ THE FINAL ANNOUNCEMENT IN THE FIRST CHAPTER FOR IMPORTANT INFO BEFORE STARTING PLEASE!!

What's so funny about HoPe, MERCY and the Pacifist way? by lisetta888

The right thing to do: everyone has their definition of right and wrong. Should you always follow your morals? Or is sometimes the right thing to do to abandon them, to sacrifice them for the sake of everyone else's safety? Error, Nightmare and the Gang know no MERCY. No matter how many times they're defeated, they never stop hurting people. Will the Stars keep following their morals? Or have HoPe, MERCY and the Pacifist way become obsolete?

"Bullseye" A Killermare story by Tornado346

Killer is a sans, and so is the rest of his crew. They call themselves "The Bad Sanses." They've all had one goal at some point in time, revenge. However, Killer is a unique specimen. He is an emotionless being. He feels nothing and nothing only. No remorse. No happiness. No mercy. All he knows is "kill," and that's how it's been for long time. However, one day he comes across a new particular type of Sans. A very colorful one. He feels something he hasn't felt for years. Freedom. Once Nightmare finds out, it's not pretty. Killer was his most loyal worker. So he decided he had to end this "friendship." The question Killer asks is, why? "Why do you need me to feel nothing? Why do you want me to be a part of your crew? You always tell me how useless I am. If I'm so useless, why do you need me?" Nightmare couldn't give him an answer. But, maybe, for once in his life, Nightmare feels something for only Killer that isn't so negative. 🎨COVER ART🎨 COVER ART WAS NOT CREATED BY ME, I REPEAT, NOT CREATED BY ME ART WAS CREATED BY pecil(BB) or @mm_loves_pencil ON TWITTER SUPER FREAKING TALENTED CHECK IT OUT!!!! ⚠️Warning⚠️ This fanfic is a little toxic. I tried making everything as canon possible, which is why I'm putting this warning. However, after writing this entire story, I realize some things are more fanon than canon. Nonetheless, serious angst goes down in the fanfic, so be warned. Contains: Heavy language Sensitive topics (such as abuse, trauma, and depression) Angst Smut (maybe, I'm still deciding) Graphic scenes containing gore -if any of the following bother you, I highly suggest not reading this fanfic- |you have been warned, so don't come at me if you don't like it| I promise it all ends on a good note. I can't personally stand depressing endings. So don't worry. But hey, enjoy your overdose on Killermare. 🤷♀️

Become Mine And Mine Alone by harrish6

(REWRITE OF THIS BOOK IS UP! It is called "Obsessive Love".) (I do not own the cover, Undertale nor any of the characters besides my OC's, they belong to their respectful owner. For some reason, I just see Error in the front instead of passive Nightmare.) Error, Forced God of Destruction and Destroyer of Universes was largely unknown unlike Ink, the Creator and God of Creation. Their fights were unseen by the AU's, none of the Monsters knowing about the Destroyer as Ink doesn't want them scared and Error gave no shits if anyone knew him or not. But Error's job is a complicated one, one that he is forced into, and he has to get involved to destroy the worlds. He doesn't touch the Original AU's, but the copies that Ink makes have to go. It was only a matter of time before something happened. Ink, in a middle of one of their fights, blinded Error, hurting him much more badly then ever before. In panic, Error ported into one of the Original AU's. Ink, fearing what Error would do, tells Dream about the Destroyer. Now the hunt is on for the broken, blinded skeleton. Meanwhile a blinded Error has been taken under the wing of another powerful Monster who has fallen for the broken Destroyer at first sight. But sweet love is truly beyond him. It is a obsessive love, a unhealthy love unlike any other. Nightmare would do anything for Error, and would do anything to keep him by his side as he goes about taking over all the AU's. Now to convince Error that he should be his and his alone.

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Slide 1 of 9

Given An Unwanted Second Chance cover

Break the cycle cover

Unwanted protection cover

To Kill A Killer cover

MagicalVerse cover

Ashes to Ashes (Discontinued) cover

What's so funny about HoPe, MERCY and the Pacifist way? cover

"Bullseye" A Killermare story cover

Become Mine And Mine Alone cover

Given An Unwanted Second Chance

(TW: unaliving thoughts and memories at the beginning. It gets better over time, don't worry! Trauma is difficult to overcome...) You didn't want a second chance. You didn't want to survive. You wanted the sweet release of death. But it seemed like the universe was far too cruel to allow you even that. It took away your memories, your free will to choose whether you live or die...hell, it took the one thing in life you owned! Your own name! And now it seemed like you had to live yet another cruel life, doing things you never wanted done to others. But...at least you could do things your way. Maybe this second chance wouldn't be so bad... (Reincarnated as Nightmare Sans, but unlike other stories, you have no clue what Undertale even is) (WE REACHED NUMBER 1 IN THE UNDERTALE TAG YOOOOOOOO) (9/13/25)