1 - 20 of 194 Works in Error Sans/Dreamtale Nightmare Sans (Undertale)
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Disclaimers:
Several details in this fic are heavily inspired by 'Blue joins the bad sanses' comic, so go check that out
Canon innacuracies: Passive and Corrupted Nightmare are the same person, Ink is the creator and not the protector, Ink, Error, Nightmare, and Dream, are all gods, Blue, Killer, Horror, and Dust's specific au timelines were all destroyed, and i took liberties with how the void works. Also, no Cross sans will be mentioned, i don't know enough about underverse, and there will be some OC non-sans God/entity/things later on. The fic will be split into parts, each lasting nine chapters.
Schedule: Once a week, on Saturday, Sunday, or Monday, and i will post art or a reference sheet with every chapter. Trigger warnings will be specified in chapter notes. I've never written for undertale before, so please let me know what you guys think :3With that said, the actual plot: After an injured Error crashes into Nightmare and Co's home, a close bond starts to form between the two gods, both forced villains. In light of Ink's attempt to kill Error, Dream finally starts to lose it, and Blue gets dragged along.
Average chapter length is 500-2000
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An Errortober challenge to myself to write a fanfiction cenetered around the best Out-Code in the multiverse: Error!
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Out of the blue, a destroyer appears amongst the many au’s of sans, and his name quickly spreads around like an infection. Not too long before it reaches the non-existent ears of Nightmare.
Nightmare concludes that he needs this monster by his side.
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Working through issues with a shunned diety by Hellian_Eden, Jesus_fox
Fandoms: Undertale (Video Game)
04 Oct 2025
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The Multiverse is vast and nigh infinite, possibilities, concepts, the very function of a world's reality only limited by sheer creativity.
Within this realm, Dreamtale exists as an enigma, plucked from another Multiverse entirely. The tragedy of it's Story forced to continue beyond it's Endings, for it forced the concept of Balance into the Multiverse's rules. Now open-ended, the only two Characters wanders throughout the Multiverse as one of it's Outcodes.
Dream broke out of stone to one colorful and curious Inkblot, so much to comprehend for someone so small. But alive nonetheless.
Nightmare woke up freshly dead.
Au: Get it? Cuzhe died lmao
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Day 8: Free day (Mate) by Geeky_Forever
Fandoms: X-Men - All Media Types, X-Men '97 (Cartoon 2024)
02 Oct 2025
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Tis my final fanfic for this years Morpherine Week so I decided to treat you all for a good old fic featuring Logan having more animalistic traits
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If you have read the old version that I am too lazy to edit please erase it from your mind and put this work in its place instead pretty please.
~
TLDR: Error carries around a Miniature version of Nightmare around with him for like half or 3/4 of this fanfic
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Where Have You Buried All Your Children? by Estel_dreamer
Fandoms: Undertale (Video Game)
30 Sep 2025
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Ink was familiar with creating, it’s what he was created to do after all. It was woven into his very magic and essence. Every universe, every variant derived from him in some way, whether it be from being formed by his own hands or splitting off from his own creation into something new. But even so, they were never truly his own. He gave them tangibility, but they gave themselves form, they took his starting point and rushed headlong into the unknown. He loved them all the same, as fleeting as they were.
Ink knew he shouldn’t have done it. He was putting more than just himself and this new universe at stake. But he wanted something that he could call his own, he wanted to be selfish and greedy just this once. He’d seen others have children, have beings tied so closely to themselves that they loved and called their own. He wanted that, he wanted his own child, his own creation.
A choice to be selfish may be just what the multiverse needs though to start repairing broken bonds, to form a happy family once more. Or it might break it all apart once and for all. Only time will tell
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A collection of Undertale UTMV one-shots and small drabbles that I don't want to make entire stories for.
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A wish for connection that would never be, for all that he would receive from that loveless relationship was the act of twisted desires. Manipulated into committing heinous acts. Error was doomed from the moment he uttered “I love you” Oh how he began to loathe those words.
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In the event of Undertale's 10th Anniversary, here's a glimpse at Deity-verse's future. Where they're not at war.
Can be read as standalone
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Deity-verse world-building and deleted scenes. by Jesus_fox
Fandoms: Undertale (Video Game)
12 Sep 2025
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Scrapped scenes that didn't make it from the main fic.
"Working through issues with a shunned Die-ty" (pun-intended) will be updated monthly unless something happens to me.
I don't know if it will be at the start, or end, or middle even! Of the month but it will. Episodes of productivity may not apply.
Comments feed my ego and get ideas out faster Idk what to tell you.
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This fic is more of a what if situation. What if instead of Nightmare taking Cross in, Error ended up doing that? How different would things be?
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Error watches, unflinching, as the skeleton's giant knife materializes, slicing through the stillness of the void. The vibrant glitches around his fingers pulsate more vividly in response, mirroring the tension. Despite the display of power, Error’s demeanor remains composed, almost amused by the dramatic reaction.
"You can call me Error. As for how I arrived here," he gestures loosely around them with a hand threaded with glitches, "I travel where the code calls, where anomalies beckon. Where the multiverse needs cleaned of anything that could harm it, and this place," he pauses, glancing around the stark whiteness, much like his own home, "Screamed for attention."
His gaze settles back on Cross, the colorful chaos of his form stark against the void. "You, however, are an interesting anomaly. Fighting so fiercely, clinging to existence in a world that has seemingly been erased." Error hummed, eyes still searching.
[[[ Slow Updates ]]]
Series
- Part 45 of Undertale Fics
- Part 5 of Roleplays
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Error and Nightmare moved on from each other. Finding someone else to spend the rest of their natural life with, they never expected to ever see each other again with how big the multiverse was. That was all proven wrong when their children became friends and they figured out they were both divorced, not to mention single.
(I am shamelessly going to make them hate/love each other)
*Fic inspired by Song: I Could Never Fall in Love With You by Tub Ring
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Nightmare and Error were two sides of the same coin, yet they never got along. One's goals were beyond the others understanding. But as the tides shift, they have to work together to survive. Eventually, reluctant alliance shifts into something more. Something deeper.
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Error ragebaits Nightmare into having sex basically
(sex not included. for now)
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Dream is desperate and he resorts to the one method he swore he'd never try—killing Nightmare. But things don't always go as planned, fortunately, things changed for the better.
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Killer was bored again. What does he do?
10:48 am
*kills u cutely* 💖💞🎀 added 8 people to Mentally Ill Skeletons 🗣️🔥🔥💥‼️
Yeah I. I started a chat fic. I am so sorry.
Genuinely have no idea whether this will be continued or not but I have hope at the moment
Nightmare (by Jokublog) - Mamanootmare
Dream (by Jokublog) - 🌟Dream🫶✨
Killer (by Rahafwabas) - *kills u cutely* 💖💞🎀
Horror (by Sour-Apple-Studios) - MAMAIMNOTDOINGDRUGS
Dust (by Ask-Dusttale) - hrngh soup
Cross (by Jael/Jakei) - *comically loud buzzer*
Swap (by the Undertale Community (?)) - The Supreme Swap 💠
Ink (by Comyet) - waitwhatwasmynameag
Error (by LoverOfPiggies/CrayonQueen) - GlitchInTheSystem
Lust (by NSFWShamecave) - Jealous? 🩵
Undertale by Toby Fox! -
i "befriended" your husband last night by InsignificantArtist
Fandoms: Undertale (Video Game), Deltarune (Video Game)
18 Aug 2025
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Prompt: A breaking up BC
Series
- Part 8 of cross-fandom crossovers
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Luego de sufrir años sin nadie con quien compartir su calor, Flaw (Horror!Error), resive ayuda de su hijo quien sabe a quien exactamente buscar...
Flaw (Horror!Error)
Hunter (Horror!Ink)
Moon (Horror!Nightmare)Series
- Part 1 of Horrorverse
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Nightmare witnesses Error destroy an Alternate Universe in a quick and fluid motion. Such powerful magic, and negative emotions simply overflow out of Error. Someone as strong as Error, would make an excellent ally. Though Ink sees Error's potential too, and Ink is willing to play dirty if it means making a new friend. Death sees those familiar red glasses, and glitches around the body when stressed, and the blind eye that he saw in his beloved Geno. Who can win the favor of the new guy in town?