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.

Underfell AU. Chara gets drunk and asks a searching question, revealing some trauma that's been haunting them. Sans tries to help. Set after Sensations, but can be read alone.

What would you rather see? A skeleton and a human talking about magic? A king thinking over his decision on if he should let humans live underground? A flower who's hellbent on killing everyone and everything? Or perhaps a young aspiring guard working their patrols diligently. The side stories of their lives, chosen by our readers, reside here. Sequel to Two Worlds, Two Souls.

After sacrificing the souls to destroy the barrier and give everyone a happy ending, Asriel stayed behind in the Underground. He feared that, without a soul, he would hurt everyone as Flowey. But when a new human falls into the Underground he decides to help her out. And during their travels the duo have interesting encounters and discoveries in the now empty(?) Underground.

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.)

(This is a remake of the original What if) 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?

"The little girl just could not sleep because her thoughts were way too deep, her mind had gone out for a stroll and fallen down the rabbit hole." - A life of fear is not what Frisk ever expected to have. - Warning: this is a dark AU that tackles mature themes and is not recommended for sensitive readers.

Before the events of Underverse begin, seven people disappear from their Multiverse. Dream, Error, Fresh, Stretch, Outer, Core!Frisk and Cross!Chara are trapped in a new world that they can't leave until they watch everything they're given. They get one chance and have to choose carefully what they change, for better or worse...

the end of the second arc is upon us. this is gonna be a... fresh change of pace.

A love story between Sans and Natasha (credits to Dragonflame99 original fanfic Where's my samurai.)

Had she finally found love? -A silly drabble (100 words other than notes) - Couldn't resist it. Wrote this in my break at work.

Sans' threat may have not caused any problems with Frisk, but the human in front of him when he makes his threat isn't Frisk. Sans' threat caused a seemingly pacifist to reset into a genocidal timeline.

Frisk had been pushed into a corner, he was blinded and was chased for a long time, it wasn't supposed to be like this! he was a prodigy that this Era of war needed. Alas, jealousy had killed one of humanity's hopes, Or has it?

The monsters never ended up in the Underground, thanks to a person who was half-human, half-monster. She and Sans keep watch for those foolish enough to enter the magical forest surrounding Mt. Ebbot. What happens when Frisk and Chara enter those same woods?

December 25, 2015 Mysterious black briars destroyed the whole of Ebott. Every inhabitant was lost except for a pair of brothers. Not long after, a tragedy claimed the younger one. Since then, the sole survivor did everything he could to prevent the calamity from spreading further.

Mi nacimiento fue la causa de aquella ruptura, la traición infligida la hizo más grande. Los universos alternos colapsan. El tiempo termina, los seres inmortales mueren. El destino se ha sellado. El equilibrio esta roto. ¿Qué es lo que debería hacer? Ser el sacrificio, eso es obvio. Y sin embargo, "El destino es un hijo de puta." Murmuré, mientras trataba de seguir cuerdo. [Yaoi]

On a pretty autumn day, an older Chara & Frisk discuss the possibility of raising a child some day in the future.

A new Arc Begins!

You had gotten an invitation to one of Mettaton's parties. Everything was going nicely, talking with your friends and having a good time. Until you realized you didn't have a ride home after the party was over. You asked Mettaton for a ride home, but he had a better idea.

This is a sequel to my old story, Integritale, which you will find in my profile. I don't know if this could be considered an AU to the Undertale Universe, since I did add a lot of stuff, but still tried to adhere to the canon as much as possible. In any case, please, enjoy! Any feedback is welcome!

an undertale AU filled with drama, suspense, and twists!

Malory Wares is a massive Undertale fan, to the point she asked for Toby's permission to make and program a fan project of the fabled Hard Mode of Undertale. But when she uploads it, she is suddenly transported to the Underground, but in real life and no 8-bit graphics! But when she learns she has a soul filled with intelligence and magic, she must use them to go back home. Rated T

Break of day, the dawn is here, Anny's up and pacing. Compromise or persevere, his mind is racing. Seems like two romantically inept dorks can't confess their obvious as fuck feelings for each other What happens when they can't bottle them up no longer? Doubletale belongs to XWolf26 and Mako belongs to XRabbit

They say that you die a hero, or live long enough to see yourself become a villain. In Seth's case, maybe he should have just died.

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.