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.

The Rescue Arc is picking up more steam!

An unexpected helper saves the day.

When Papyrus cannot sleep one evening, he goes out for a walk and bumps into Grillby. From there on, they decide to meet up by the Gyftmas Tree every night, be it to talk about everything and anything or for the friendly company of another monster. They soon learn more about each other and become fast friends, and possibly more? (Slow-burn tale with much mutual pining)

Eran las primeras vacaciones que se tomaba. Sans pensó que serian relativamente tranquilas, claro, si se ignoraba los gritos de su hermano, Papyrus, y el enamoramiento de este con Frisk; la molesta y deportista Undyne, intentando que se levantase del sofá y moviese el esqueleto; además de la familia Dreemurr, conocia a Toriel, pero sus hijos eran otra cosa. [Chara x Sans] [Chans]

Instead of being forced underground the monsters were separated from the humans with a magical barricade. What happens when a young child, desperate for their mother, travels past it in the hopes of a deal.

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.

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.

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.

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.

our story begins with the simple question: What happens when someone take pity on the six souls and sets them free?

After the ending of the True Pacifist Run both monsters and humans have started to live in the same community. Muffet is one of the monsters that has had success, but she didn't do it alone. She has Frisk to largely thank for her successful business.

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...

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.

In a pacifist timeline, where Frisk is pretending to care about the monsters, Frisk goes home and exposes all the monsters' crimes. This has drastic consequences, especially for Sans.

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.)

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.

"El jugador" ha muerto... Y ahora todos quieren JUGAR. En la peligrosa Ebott City, radica una constante inconformidad por habitar monstruos y humanos en un mismo lugar., desatándose conflictos delictivos que atentan con la vida de los habitantes. Sin importarle las advertencias de su madre, Frisk decide ir a la ciudad y tener su florería junto con su compañero y mejor amigo Flowey

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]

An informational guide to the traits, powers, and anatomy of human souls.

A shooting star has landed on Mount Targon, the tallest mountain on earth, rumors say that whoever gains the power of the star will gain unlimited power. Competitions were held every year at the foot of Mount Targon. This year is the year Sans and Papyrus officially participate in the race. Will they rise to the top or will they fall down to their death?

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...

Hace años que los monstruos han salido a la superficie gracias a Frisk, que se ha sacrificado por la libertad de ellos. Pero a pesar del tiempo Sans no puede superar su duelo. Una día simplemente desaparece alertando a sus amigos, sobre todo a su hermano, que comienzan su búsqueda con un muy mal presentimiento.

After Chara accidentally walks into their best friend undressing whilst searching for something which was theirs, they realize that they do not feel the same way about them as they used to when they were children. Things escalate from here and they both share a night they will never forget. Neither the first time they will experience it... Nor the tenth. (Charisk lemon)

Genocide. Last corridor. Frisk with a knife in his hands, and on the contrary stands Sans. Everything is as always, but according to the law of meanness, everything did not go according to the standard development of events...