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But Hope Remained by theriveroflight
Fandoms: Undertale Yellow (Master Sword Video Game), Undertale (Video Game)
08 Oct 2025
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Summary
What remained after Pandora's Box was opened? What stays behind when everything else is lost?
In an Underground where almost everything was lost, one thing remains: the fusion between the SOULs of Kanako Ketsukane and one fallen human.
But Ceroba is trying to learn from her past mistakes, and has some apprehensions about Kanako being used as just a tool.
Alphys, now queen, is trying to learn as well -- to be more open about things, even when they scare her.
But how much is "trying" really worth when compared to the harm inflicted?
Series
- Part 1 of pandora & hope
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Welcome to My Seap. by WhatamIDoing_GoodQuestion
Fandoms: Undertale (Video Game), Deltarune (Video Game)
08 Oct 2025
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Summary
Frisk notices they're low on healing items before they face Undyne and are confused as to why the weird thing controlling them didn't get any more. Having realized that said thing is absent, or at least not actively controlling them right now, they make the choice to go and check out a path in Waterfall, they had noticed beforehand that the thing hadn't. Maybe they'd find a shop or something there, or maybe it would just satiate their curiosity.
However, while they explore this new area, they meet a new monster they had never seen before.
Series
- Part 2 of Darkners? How About Monsters!
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After the events of an Undertale neutral-pacifist ending, Napstablook reaches out to Shyren in hopes of rekindling their friendship. Things go somewhat well.
- Language:
- English
- Words:
- 504
- Chapters:
- 1/?
- Kudos:
- 1
- Hits:
- 10
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Summary
Toriel shows Sans a bedroom.
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Summary
Starlo's trying his best to hold onto hope. Not that there's much of it left these days.
(Starlo POV of events from "But Hope Remained", with some connective tissue between them.)
Series
- Part 2 of pandora & hope
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Summary
The king has fallen.
In the devastation left in the human's wake, a new king is needed. Papyrus steps up to the challenge, assisted by his brother.
Sans is sworn to obey the crown, bound by the Delta Rune. Regardless of who wears it.
But when dark alternates show up and threaten war, Papyrus has to make the hardest decision of his life, and Sans finds out the chains that bind him might not be as secure as he'd like.
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Summary
This takes place in a post Underfell King Papyrus ending.
Struck by under population, King Papyrus makes it law that all monsters left alive by the murderous little human have to procreate. This leaves Fell!Sans and The King himself in a tight spot. There are no female skeletons left in the whole Underground and both skeletons are sure they are the last of their species. Fell!Sans proposes something. With the help of the first Royal Scientist's machine to travel to other universes, he will find mates for breeding purposes.
Tale!Sans is having his first sub heat as a female. This happens when there are only males left and the strongest one undergoes a gender swap. He knows this means Papyrus will have to be his mate.
That won't do. They are brothers, for the Angel's sake! So he does what he does best, HE RUNS.
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Summary
Their King is dead. The six Souls are Gone. Their future lays in ruin.
Frisk has slipped through the barrier and left the monsters with shattered hopes and a toppled monarchy. With no witnesses, it was pure, selfish regicide. They were loved by all, and thus, their betrayal cut all the deeper. For the third and final time, humans had stolen everything from them.
Anger has a way of changing people. It remains in the Soul even as memories fade.
Frisk may be gone, but the RESETS continue, multiplying the resentment within them and morphing the residents of the Underground into tightly wound reflections of their former selves. No longer in a position to do nothing, Sans is Determined to find a way past the barrier for the sake of his brother, and for the sake of justice.
He’ll give anything to achieve that goal. His Soul included.
He’d found an alternate method that should work, buried deep inside a gilded dusty tome in the royal library. Instead of using LoVe to pass through the barrier, Sans was going to use love. He was going to have to gain a consenting human, and convince her to bind her Soul to his. Permanently.
Series
- Part 4 of The Butterfly Effect 💚💛🧡💜💙🩵❤️
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Summary
Or: The one where an adult Frisk wakes up after their funeral, back at the beginning of everything. Of course, they know how to navigate all their adventures underground, but... Does anyone want to tell them what kind of sin they committed? After waking up each time, in different timelines, some of which they even know they generated, and others that they themselves didn't commit? Yeah, this isn't going to happen (it happens anyway).
Series
- Part 3 of Random Writing
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Following the death of the Underground's king, Asgore, and the disappearance of several important figures, the monsters of the Underground rush to elect a new ruler. Their options are thin, and when a puzzle-making skeleton from Snowdin assumes the throne, their new King, Papyrus, must come to terms with responsibility and truth.
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We All Have Tales by ThatWiseOwl
Fandoms: Deltarune (Video Game), Undertale (Video Game)
23 Sep 2025
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Summary
Just their luck to break their fall on top of those pretty yellow flowers get a 'minor' concussion and be taken in by a tall goat monster and her barely tolerable skeleton roommate. It could be worse, if the mean purple lizard monster and the anxious deer ever decide to quit trying to kidnap them.
Deltarune/Undertale AU - What if Kris fell into the underground years after an abandoned neutral route, where a fishy empress is out for human blood for killing their best friend.
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It's been a while since Frisk abandoned the underground, leaving the residents sulk into their misery, drained of hope or the courage to live life to their fullest, hurt by the betrayal.
Sans didn't expect Papyrus to be like the other residents.
...
The idea is inspired by the song "Comedy", more specifically, by the lyrics "If you wake up in a house that's full of smoke, Don't panic. Call me, and I'll tell you a joke."
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And so the rotted pits stared into the frozen beyond
Distantly remembering being frustrated, proud, angry.
Devastated.
But they were too tired for any of that now.They turned back to the deceptively welcoming house.
Still there, even after everything.
It shouldn't be
A house is only as good as the people in it.ORRRRR
Sans is handling things AWESOME after everyone he loved has kicked the bucket
Yessiree no negative feelings here
Insert Steve Griffin Death Pose -
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Summary
Ten years after Mettaton became king of The Underground, a human named Ace climbs Mt. Ebott and is kidnapped by The King’s agents. And so, he decides to take them… Gambling?
Throughout their time in The Underground, Ace learns that the King’s so-called ‘paradise’ isn’t what it seems at first glance… and some gambling skills.
- Language:
- English
- Words:
- 890
- Chapters:
- 1/4
- Kudos:
- 7
- Hits:
- 22
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Summary
After the neutral ending where papyrus becomes King, a new human falls into the underground after an earthquake hits.
This was originally on Wattpad.
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System Error: Accidental Acquisition of Children by Frikisbits231
Fandoms: Undertale (Video Game)
05 Sep 2025
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Summary
Error slid down, glued to the tree, his back to the ground, into the lush green grass on the ground. Later, he'd take a look at his current situation and possibly eliminate the place without a problem. Meanwhile, Error was resting, leaning against this comfortable, curvy tree, closing his eyes to feel something, something of the place.
Feel... the familiar ambient magic?
Still no monsters, humans, or standard souls around. Well, no one could hurt him if he got some rest, right?
This time, he mentally prepared himself and repeated the safety tests he felt like a mantra so he could get some rest.
He fell asleep shortly after.
…
Sweetness with hints of security, calm, and the tranquility of dawning rest captured his senses. Something... familiar. Like... like chocolate melting on his tongue. He didn't know how he recognized that either. Still, he pulled the tongue out of his space, to capture it. He caught the sensations, almost becoming overwhelmed by them.
(O: The one where Error acquires an abandoned baby bone, which is, of course, his offspring too, yay...)
Series
- Part 3 of Glitches & Errors Fics
- Part 2 of Random Writing
- Part 1 of ❤️🩹💞 Caring for Babybones 💞🥰
- Part 1 of Oh, look at a fanfic with one of the fanchilds!
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A Former Royal Scientist’s Research of the Space Time Continuum by stitchthelilo
Fandoms: Undertale (Video Game)
03 Sep 2025
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Summary
A little bit of rest during her research could definitely hurt, yet her eyes began to shut anyway. The consequences to this were much more dire than Queen Alphys could’ve ever expected, and after an abnormal earthquake she finds herself stuck within the endless Multiverse.
And for some reason Sans is.. everywhere??
OR
Takes place right after the Alphys Neutral Ending, where a freak accident sends Queen Alphys out on a travel through the Multiverse.
Series
- Part 2 of Longfics
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Habiendo aceptado su nuevo cargo como rey del subsuelo, Papyrus aún tiene que asimilar el hecho de que ya no tiene toda la atención de su hermano.
Series
- Part 1 of Aporte para #IncestemberWeek
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Only a Reset away by RotBellyCrane
Fandoms: Undertale (Video Game), Deltarune (Video Game)
01 Sep 2025
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Summary
Five different endings for a Player to choose from! Just keep that FUN Value set at the right number and away you go!
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You wake up as someone who has nothing left to lose, stranded in an Underground that's slowly dwindling in life. Despite being capable of crossing the barrier, you don't dare to, when you have a personal endeavor and promise in mind.
It's a different story when you're transported into an ideal alternate timeline, where your oath is rendered void. Here, with your various counterparts, you don't appreciate reliving the life of a prisoner-- especially when it's enforced by a reflection of what your Sans could've been.
(OR: In a pacifist timeline, an alternate Sans possessing a human soul appears, risking the newly established peace between humans and monsters. If Classic Sans had hair, he's pretty sure he'd still end up bald.)
[A Various x Sans!Reader fic.]
Series
- Part 1 of parallax error