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The LowerEarth.
A place where HUMANs were sealed in by MONSTERs.
A Book comes down from the sky in a language none can understand, and a soldier is convinced it does not come from monsters.
Come join the story...
of Sand and Cactus.
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“I CAN’T OPEN THIS BLASTED BOX!! IS THIS SOME KIND OF JAPE?! WHY WOULD HUMANS SELL SOMETHING LIKE THIS?!”
The sound of a trombone plays.
“SANS!! WHAT DID I TELL YOU ABOUT PLAGUING MY LIFE WITH INCIDENTAL MUSIC?!”
“that you love it and want me to do it more?”
“SANS, I WILL DUST YOU.”
“pretty sure that’s workplace harassment.”
“IT IS NOT!”
“is too.”
Envy closes her eyes and tunes them out again as their argument devolves into yelling. She just has to get through today, tomorrow, and the rest of her life. That’s not so bad.(AKA, a less-than-pleasant dojo owner who has too many problems of her own to deal with forgets to take down a "help wanted" sign.)
Please read the before-story author's note of the first chapter!
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One day, our main character decides to open up Undertale before going out with some friends, he leaves the game on when he leaves, and when he returns, he finds the game with completely new dialogue, but as he finishes reading it, he slowly falls unconscious until he wakes up in the world of the game he loved.
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What if, instead of Nightmare initially having
adoptedsought out the Murder Trio, they were the ones who went out of their way to dig out a place for themselves in the bitter and jaded spirit's heart? -
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Yes, you read the title right. This is an askbox fic of a sans au who has endured the most painful times out of everyone else along with other Sans AUs that are either well-known or unfamiliar whenever they become available or not.
Currently available:
Self-Harm Sans
Error Sans
Healer Sans
Murderer Sans
Killer Sans
Horror Sans
Insanity Sans
Scoundrel Sans -
Justice and Injustice by lapisplayer21
Fandoms: Undertale (Video Game), Deltarune (Video Game)
27 Sep 2025
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Four years have passed since the barrier was destroyed, and monsterkind returned to the surface. William is happy to see that, thanks to his help, monsters have been able to build lives alongside humanity. His son, Micheal, couldn’t be happier either, with Noelle by his side while surrounded by friends.
However, figures from William’s past began to move their plans into action. As the future of monsterkind and humanity is jeopardized, William, alongside his family and friends, will have to stand against the coming threat, and grapple against those who believe that they are delivering justice to the world.
Series
- Part 2 of The Henrikson Saga
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Pure vanilla cookie falls into the underground instead of frisk by Phroggy1031
Fandoms: Undertale (Video Game), Cookie Run (Video Game)
27 Sep 2025
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I had this idea in art class I think and thought it would be funny for a fanfic :3
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Kidnapping the Boss and giving him the happy childhood that he deserves by catdemonakatsukigirl
Fandoms: Undertale (Video Game)
27 Sep 2025
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When Killer decided to bring some unknown science experiment into the castle, the last thing they expected was time travel. But hey now they have the most adorable baby bones ever, their boss Nightmare who doesn't know who they are and oh yeah is also 5.
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You are a shapeshifter with the rare ability to turn into an orange fox—a secret you’ve kept hidden, knowing humanity once hunted your kind. Living near Ebott, you slip into the night to run free, though the fear of discovery always lingers. Meanwhile, Sans and Papyrus have unknowingly welcomed a manipulative woman named Kora into their lives.
Behind her sweet facade, Kora is a gold digger using the brothers for wealth, status, and comfort, willing to lie, fake affection, or even blackmail them if needed.Eventually Kora stumbles across your apartments terrible condition, deciding to become “friends” with you and inviting you to stay in the mansion with her and her apparent mates. It started off fine, until she began to spread lies— rumors.. Even blaming you for mistakes, stealing. And god who knows what else.
Maybe you can help these skeletons see past whatever game she’s playing at? (Anti-Harem, That’ll switch into a actual harem..)
As well as machine chaos.
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Alternate Archive by WakuEggroll
Fandoms: Blue Archive (Video Game), Undertale (Video Game), 本好きの下剋上 - 香月美夜 | Honzuki no Gekokujou | Ascendance of a Bookworm Series - Kazuki Miya, SPY x FAMILY (Manga), 小林さんちのメイドラゴン | Kobayashi-san Chi no Maid Dragon | Miss Kobayashi's Dragon Maid, 明日方舟 | Arknights (Video Game), Touhou Project, Mahou Shoujo Madoka Magika | Puella Magi Madoka Magica, 龍が如く | Ryuu ga Gotoku | Yakuza (Video Games), Gabriel DropOut (Anime), Gabriel DropOut (Manga), Team Fortress 2, モブサイコ100 | Mob Psycho 100, Assassination Classroom, 幼女戦記 | Youjo Senki | Saga of Tanya the Evil - Carlo Zen (Light Novels), 幼女戦記 | Youjo Senki | Saga of Tanya the Evil (Anime), Vocaloid, UTAU (Audio Database), 呪術廻戦 | Jujutsu Kaisen (Anime), 呪術廻戦 | Jujutsu Kaisen (Manga), New Dangan Ronpa V3: Everyone's New Semester of Killing, ウマ娘 プリティーダービー | Uma Musume: Pretty Derby (Video Game), Plastic Memories (Anime)
26 Sep 2025
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Every Sensei is different, so who are these other Senseis?
Well, you have a skeleton that can teleport, a suave assassin who turns invisible, a dragon (and a maid?), a rabbit that can freeze a city, a Yakuza legend, and... a horsegirl?!
A collection of contained crossover Senseis from different fandoms updated for every day of AU-gust 2025!
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The Void Mage and The Skeleton by transgirlnamedafterarock
Fandoms: Undertale (Video Game)
26 Sep 2025
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A number of years after Frisk leaves the underground a void mage living on Mount Ebott stumbles i̶n̶t̶o̶ upon a entrance to the underground searching for magical materials. Various encounters and violent realizations occur as she makes her way through the underground doing her best to save everyone she can. Forced to accept the truth that things are much worse for monster kind than ever before, she will do everything to save a people from extinction. Can she do what she needs to in time? Or will she be forced to come to the conclusion that its much to late for anything to be done.
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The Last Amalgamate (The Peacock AU edition) by WingsOfShen
Fandoms: Undertale (Video Game), Undertale Yellow (Video Game), Kung Fu Panda (Movies)
26 Sep 2025
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After millennia, the barrier keeping the monsters Underground has finally broken. The entirety of the Underground does not remember what happened. All that is known is that a living human child was involved.
Before starting a new life on the surface, Frisk joins Alphys in sending the final amalgamate back home to her family, making new friends along the way and giving them their much-needed happy ending.
(Based off "The Last Amalgamate" by VyletBunni and the DeltaTraveler team. Credit goes to them for the animation series.)
Series
- Part 4 of The Peacock AU
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You my dear reader are transported in your own au as sans then when you have just come into accepting life your comfort was washed away by one tiny mistake
You have transported to one of the fanfics or at least inspired by it you have read almost daily it was the typical ani harem fanfic were a human called Y/n is a very broke collage student
And then when they get an offer from their childhood friend to live with their numerous roommates that are more like actual boyfriends then roommates
the childhood friend will most likely spread rumors about Y/n which will cause the skeletons to dislike them then end up loving them in the end
But with you there things will change maybe help Y/n along the way or sabatoge her or maybe even matchmake her to another person!
Read and find out what happens to our dear reader
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The Tales of Kháos: A Reapertale Re-Take by Palito266
Fandoms: Undertale (Video Game), UTMV
26 Sep 2025
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A sequel to the previous three stories: "Tales of Infinity," "Tales of Pragmatism and Fabulism," and "Zero Tales."
Follow the gods: a brand new species that had been given consciousness by a mysterious form and a body as well. Explore how these deities accustom not only to their existence but also to the world around them that they must protect.Reapertale was created and is owned by Renrink. Inktale was created and is owned by Comyet. Dreamtale was created and is owned by Jokublogs. Errortale and Fresh Sans were created and are owned by Crayon Queen.
(English is not my main language, so there may be some grammar issues.)
Series
- Part 4 of Markings of the Cosmos
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Susie and Noelle go to the festival together, and discover what its like to be in their new relationship. Dess and Asriel come home for a week, and Asriel takes the opportunity to start their life together once and for all.
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- Part 2 of Pinkish Lilies
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Unexpected Hero by LemonCake64
Fandoms: Undertale (Video Game), The Legend of Zelda & Related Fandoms, The Legend of Zelda: Twilight Princess
26 Sep 2025
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“Not so fun being stuck in some loop right? Trying to fight to protect what ya got, not getting a choice in it. If I had the choice I wouldn't remember either.” The words oddly felt comforting. Link let out a slow breath, closing his eyes for a brief moment.
He didn't feel alone for the first time in a long time.
And that?
That was terrifying.
“To be honest, I kinda gave up a while ago. Just sat back and let the chaos go on, felt like nothing I did mattered anymore. Everything would just be reset anyways. Stopped caring what happened, that was until you showed up.” The skeleton’s eyes bore back into the Hylian.
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Originally a fic just for wanting to ship Krusielle, this is now just straight up a chapter 5, 6, and 7 fanfiction with Krusielle (and a little 'after the story' segment once everything is done)
(Finished, finally! Just hoping I portrayed the characters well where I could.) -
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After gaining freedom from the soul kris does their usual routine get up, go to school, talk to susie etc but they have had a gave a shot and asked berdly to play smash with them.
little do they know tho a new student has came and lets just say kris DOESN'T want that.
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A novelization of Undertale, as should be evident by the title.
But... there's a little twist.
Series
- Part 1 of Undertale: The Novelization
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After the Visitor left behind that angelic abomination who wipe out 90% of humanity, Sam know's that they can't stay in the city. Searching in the former room of Sybil he found the former research of the astronomers and discover a place that was not affected by the visitor, Mt Ebott. He doesn't know why but it seems there is some kind of barrier that keep the place safe during the end of the world.
With only that as his last hope to survive, Sam and his friends go to Mt Ebott but the exalted four find them, taking them one by one until it was only Sam and the childrens.