Undertale Stories

Timelines, genocides, deaths, ... It all stopped suddenly, leaving a hole in the stream of time. How will Fate repair it ? Will the souls participating in this stay themselves ? Story started on 21/03/2026 Arc 1 : The prologue started on 21/03/2026 ended on 08/04/2026 Act 2 : The Descend started on 16/07/2026

When Frisk and her twin brother Y/N fall into the Underground as infants, the monsters who find them never expect the impact the children will one day have. Raised lovingly by Toriel, the two grow up sheltered in the Ruins, unaware that their arrival has already shifted the balance of the world below. As the years pass, Frisk becomes curious-drawn to a mysterious sealed door and the young skeleton on the other side named Sans. Their secret friendship blooms quietly, a flicker of light in the dark. But where Frisk finds warmth and connection, Y/N feels something stirring within himself-a faint orange glow deep inside his chest, the Soul of Bravery that he doesn't yet understand.

After witnessing countless Genocide Routes across endless timelines, Sans finally breaks. Convinced that humanity is beyond redemption, he abandons everything he once stood for. By embracing LOVE and accumulating EXP, Sans transforms himself into the very monster he once warned others about. After reaching LV 20, he exterminates the entire Underground, defeats Omega Flowey to end the possibility of Resets, and wins a cataclysmic final battle against a Determination-fueled Frisk-a battle so devastating that it ends with the destruction of the Solar System. Believing he has finally erased humanity forever, Sans dies in peace. ...Only to awaken in Hell. Instead of eternal punishment, he finds a city overflowing with laughter, greed, violence, and indulgence. Humanity still exists as Sinners, seemingly free from the consequences of their actions. To Sans, Hell has failed its one purpose. If Hell won't judge humanity... He will. Armed with soul-destroying magic capable of permanently erasing Sinners, Sans begins a ruthless crusade through Pentagram City, becoming one of the most feared beings in Hell. While Princess Charlie Morningstar fights to redeem lost souls, Sans believes redemption is nothing more than a lie told to monsters and sinners alike. As mysterious disappearances spread across the Pride Ring and powerful Overlords begin vanishing without a trace, Charlie and the Hazbin Hotel are forced to confront a terrifying truth: This isn't just another Sinner. This is a broken judge from another universe who has declared war on humanity itself. Caught between redemption and retribution, hope and hatred, Charlie must find a way to save the one soul who no longer believes anyone deserves saving... before his twisted sense of justice plunges all of Hell into chaos. Because everyone gets judged... And in Hell, Sans has become the judge, jury, and executioner.

"the healer likes t' sleep. like, a lot." Axe looks at the sole female AND human member of Nightmare's subordinates. She was only ever awake for about 8-10 hours a day, rarely ever 12, it was both fascinating and irritating at the same time. He was damn sure humans would be awake for more hours than that, he even asked Murder at the time if it was normal. Said skeleton didn't give a single care though, his words: "who cares, makes her more tolerable. 'sides she gets her job done." The cracked skeleton just couldn't shake off the feeling that there was more to it than meets the EYE. ━━━PHOTO CREDITS: Whale鯨豚 [@Whale5511] on X! ━━━MOST NOTABLE RANKING: #1 in sansxreader, horrortale, something new and badsanses on 23/12/2025 #1 in undertale on 25/12/2025 #3 in bittersweet on 24/12/2025 #5 in reader on 24/12/2025 #19 in sans on 23/12/2025 ━━━━━━━━━━━━━━━━━━ DATES PUBLISHED: 001 ━━ July 29th of '25 002 ━━ July 30th of '25 003 ━━ August 1 of '25 004 ━━ August 3 of '25 005 ━━ August 6 of '25 006 ━━ August 8 of '25 007 ━━ November 8 of '25 008 ━━ December 22 of '25 009 ━━ December 23 of '25

TW: Swearing and slight gore Y/N reincarnates in the anti-void as a Voice... Will he befriend error or will they make them hate their guts? And will they meet other people? Only time will tell. Hello, this is going to be my first book and idk if it's going to be good so meh :v This story was inspired by transported as a voice by Virus_bOi, I obviously do not own undertale and I don't keep up that much with the fandom, so some personalities might be different, but hey. I can just say that it's a different multiverse ¦ ] The cover image is from Shira Wolfiecute on tumblr

Dear, Nightmare, Cross, Error, Dust, Horror, Killer, Lust, Reaper, Geno, Ink, Dream, Blue Hey guys, It's me...Sci, So uh, I've just discovered something really cool. And I mean like, really cool. I was wandering if ALL of you could come down to my lab this afternoon so I can show you this thing. I promise you'll love it! -Sci- Nightmare frowned and looked at Error, who had been reading over his shoulder. He simply shrugged in response. "Eh, might as well, I'm bored and we've got nothing to do. What could possibly go wrong?" What could possibly go wrong...? Ehehehehe I wonder.

Killer always knew he would burn in Hell. All the sins he committed. All the death that came with every step he took. Killer was out looking for something new, while Nightmare wasn't around to fix his unstable soul. He meets three little red bastards and their big bad wolf. "eh, you kill, i kill. what's the worst that could happen?"

What If... The Knight killed Frisk in the Wastelands? How do the other Indie Characters react to the Reset?

what the fuck is touhou. .that was new problem for our new disastorous being - infected sans!(aka jacob). btw infected sans - alphatale by shadikal15 there will be other arrival of alphatale in touhou universe and possibly several unieqe interaction of abilities. This is not serious crossover btw so no need to be argued with how two universe react to eachother?(Technically three since edensphere and Twilight realm is seperated wiki with alphatale).would it be a war between two old realm or coexistence of two seperated world? And for touhou it was obviously from ZUN and both alphatale and touhou project wasnt own by me(except my OC i guess)

• I reccomend you do not read this, this is my worst work yet despite it being my first. There is another story on my profile that is under development and editing. Other than that everything else here has remained untouched for over two years. DISCLAIMER: i do not own undertale nor any videos, pictures, intro, etc. And i reccomend checking out the original creators You are an ordinary teen or are you with a weird crystal appearing right next to your bed with it telling you strange things and having an encounter with a flower saying you soul is special are you really normal and is the senior year of high school really be normal with monsters starting to teach and attend school will your life really be normal? ------------------------------------------------------------------------- (This is the completely Un-Edited Version Except For The Disclaimer And Part/Chapter Date, For Those Who Would Like The Original Reading Experience) (Trust me, I've triple checked the entire thing, it sucked, lol) (Disclaimer) This is by @Shyboxes. I am archiving this with permission so people will still be able to read it. :)

My other art books are full, so here's a new one! The third! I wanna share my tumblr art with you guys <3 I add 3 new chapters at a time. Not everyday updates, just whenever. ENJOY!!!

the bad sanses do a raid on an illegal auction of many rare, dangerous, and illegal things. but after the dust settles, killer finds what he believes to be a weird mutated cat and decides to take it back with him art by me. my first book, and feel free to correct my spelling in the comments

Long ago, two races ruled over the Earth: Humans and Monsters. One day war broke out between the two races. After a long battle, the humans were victorious. They sealed the monsters underground with a magic spell. Many years later... Mt. Ebbot: year 23XX Legends say those who climb the mountain never return. Here we see our main protagonist, Izuku Midorya, being chased by his childhood bully: Katsuki Bakugou. He ends up climbing Mt. Ebbot in hopes of escaping and takes refuge in a dark cave. While wandering the cave for a hiding spot, he fails to see the giant hole... and he falls. ------------------------- Here is the rewrite of my Fallen Hero AU. I do not own BNHA or Undertale. The cover art is mine. Ownership of Undertale goes to Toby Fox Ownership of BNHA/MHA goes to Kohei Horikoshi. This is a BNHA x Undertale crossover. It's my first story so please enjoy. ⚠️ Warning⚠️ This book contains swearing. Yield, oh innocent ones. There are also mentions of abuse, discrimination, and bullying, so avoid that too if you don't like it.

Quetzalcoatl Arc is the third daughter of Liam and Alsie Arc. She is also the mother of Jaune Arc as she raises him while the rest of the Clan but she saw the potential in him and trained him.

Y/N, 5 year old, was found in a collapsed AU that just wouldn't be erased from existence. The bad guys found them and took them in as their own. Who knew taking care of a child was so difficult

If given the chance, would you start over? After falling into a timeline where nobody was murdered, his mother never died, and his father was never erased, Sans should be ecstatic that he has a second chance with his loved ones. But there is no denying the trauma he'd been through, either. Everyone is supposed to be dead, after all. What if Frisk comes back to take it all away again?

Y/N has always been weak; from a young age, she's been in and out of the hospital. Often left alone in the hospital room with only the nurses to keep her company. Yet she somehow finds herself dropped into a world of darkness, along with two of her classmates, Kris and Susie-a world where she has to be strong to survive and make it home before dark. Only three heroes would be needed: a human, a monster, and a prince from the dark. What if another human falls into the Darkworld, one who is unaware of the SOUL within her, a SOUL that is full of WILLPOWER? A SOUL that has yet to awaken, a SOUL that begins to... never mind. She is already too weak to awaken it; days in the hospital have left her as fragile as the golden flowers... yet she proceeds through the Darkworld. Following her classmates and their new friend through it, unaware of a pair of red eyes watching her along the way.

Gonna post random drawings! Yeah

Alternate Future Of The World. Includes Crossovers From GT, UT & SU That Are Marked With DG![Crossover].

Undertale ideas, some crossovers. may write them, but also up for adoption. please message me if you want to adopt one as I'd like to read it myself &lt;3