"Might controls everything. And without strength, you cannot protect anything." A man falls into the underground and finds himself face to face with a demon. But he doesn't have the strength to beat them. In order to protect the ones he loves, he swore to do what ever it takes. Even if it means becoming a demon himself. (Based on XWolf26's DoubleTale)

You are dropped into the underground world, home to many monsters when a very voluptuous goat mom approaches you and takes you in. There are many mysteries centered around you. It is up to you if you wish to uncover them. This thicc monster lady would like to help, but she wants quite a bit from you. Will you be able to satisfy her overwhelming needs like her husband? Could what yo

Ever wondered how Sans is so compliant to Papyrus' demands, well let's take a look to Sans' training, shall we? Underfell AU. Written for the prompt brainwashing for Bad Things Happen Bingo. Oneshot

Thanks to a visit from an alternate Gaster, Frisk now has the power to heal the AUs, but something is trying to stop her. Can she succeed in her quest? Done as a request for dream1990. :)

One of twenty-one - A young man named Carter - was pulled into Undertale under the command of different W.D. Gasters. When he comes across a Genocidal human, he has only one path laid before him - Fight, or die. (Spinoff of XWolf26's Doubletale. Final time I'm rewriting this one, I promise.)

After thousands of resets, Frisk succeeded in doing what everyone, including Sans, thought impossible: bringing back the lost prince and destroying the loop that was causing them so much suffering. Two years later, now an ambassador, he seeks to restore human-monster relation, while fighting against an evil that seems to be spreading in Ebott and threatening his new family.

DIRECT SEQUEL TO "PATCHWORK SOUL" — A few months later. A family of monsters and their little human kid try to start life anew beyond the confines of a giant mountain. Maybe they find something. Maybe they lose something. Time flows ever onwards, but sometimes it goes sideways, and it's heavier than they thought.

Golden Quiche / Crimson Keeper specific universe. A 'Chronographer' is a title reserved for those with the power and authority to observe, manage, and record the annals of spacetime. They're the primary historians of this world.

With a quick use of Sans' magic, we had returned to our home on the surface. The lovely three-story home sat quietly among the trees under the moonlight. Sans always loved to teleport just outside the door and glance at it before walking in. He was a little less lazy since coming to the surface. So much to learn. So much to do. So much to love. SEQUEL TO "TWO WORLDS, TWO SOULS"

Tell me my friend. A story as my eyes fall, one last story of how it ends, how it begins... and once its over let my eyes fall peacefully, and then when we meet again you can tell me everything new. "Well... it all began with a tear."

Twenty-one iterations of W.D. Gaster gambled on plucking a human from beyond their reality to stop a vicious cycle of genocide, and changed the multiverse forever. In a scrambled timeline, away from the grand tragedy of The Angel & The Anarchist, a young woman awakens on a bed of flowers in her pajamas...

(Being Continued) Down into the dark, Chara fell. Down into the dark, an experiment was run. What if she got to go home? But what if it wasn't to the world as she knew it? What if she was placed into another, at another time? What if that happened to be a version of Underfell?

A kid falls down a vast chasm into the deep, and is set upon by countless monsters eager to murder whoever falls down and claim their souls. Somehow, this child is the villain in your story.

Before the start of this story, seven Humans, varying from children to teens, climbed Mt. Ebott for various reasons. No matter their reason, all seven fell into The Underground. What I can confirm for you now is this: The Eighth, despite a differing circumstance, has the same reason to climb the mountain as the first. Like the seven before him, he will fall into the Underground.

Human magic before the Barrier was achieved through the Cooperative Connection, a bond wherein a monster gifts his or her memories, and thus a part of their soul, to a human. Discovered when Queen Toriel gifted a blind prince a blanket which she weaved in her memories of describing the starry sky far above her castle in the Monster Capital.

Sans is kidnapped kidnapper...

The story right after Undertale.

It has been a month since Frisk has went missing... but for some reason, it feels as thought she has been gone for months. Her sister, Eve, decides to follow in her footsteps and discover something bigger.

Being a normal day like any other, Mettaton has ended up in a place and time he doesn't belong to, but even if he's alone, the star of both monsters and humans will shine and bring home no matter where he's at. Happy eight anniversary, Undertale.

Estando en medio de un día normal y corriente, Mettaton ha terminado en un lugar en el que no pertenece, pero incluso estando solo, si hay algo que caracteriza a la estrella favorita de humanos y monstruos es su capacidad para brillar e inspirar esperanza sin importar donde esté. Feliz octavo aniversario, Undertale.

At the end of the war, monsters don't have the choice : they have to join Mont Ebott for survive another day. Sans and Papyrus, forced to run away after the attack of their village, are delivered to the horror of the war without any help and this one objective. But as sons of the royal scientist, W.D Gaster, they are an easy target. Both of them start a dangerous journey.

The Riverperson is a very mysterious person in the Underground. Letting Frisk ride in their boat wherever they need it. They are always so carefree, but what if there is more underneath the surface.

"The ninety-fourth reset. That's when he started to unravel—or at least, that was when you started noticing." Despite reaching a "perfect" ending, you still reset in the hopes of saving Asriel . . . at the cost of losing Sans. When rewinding time is no longer a factor and events don't go as planned, can you find a way to save everyone? TW: depression, suicide, self-harm, language

What if two humans were in the Underground at once? What if one human was DETERMINED to stop the other? What if they could both SAVE? What happens when an Unstoppable Force meets an Immovable Object? When a certain scientist pulls enough of himself together, he finally finds a way to stop the destruction of his world. (Undertale AU. Rewrite of DT.)

A single choice has a huge impact. Not just on one person's life, but on everyone around them. In the Underground, there are many paths one can take. But when Frisk makes a choice that takes them off all the known paths, the world is changed forever, and Frisk becomes intrinsic to the fate of not just Monsters, but the whole world.