This is a story about Percy Jackson, after all his adventures in the books, falling into the world of Undertale, and going through some of that journey. In this world, Frisk does not fall down, Percy does. I do not specify how, and I may or may not specify in the future. How will Sans react to Percy Jackson and his insanely high level? And how will Percy respond to Sans? We'll see.

Long ago there were two races ruled over the Earth: Mortals and Demigods. One day, a war broke out between the two races and after a long series of battle, the mortals were victorious. The greatest of their magicians confined the Demigods to the Underground with a magic barrier... And you can guess what happens next. Crossover between HOO/PJO and Undertale. Rate T just to be safe

After the events of Heroes of Olympus, Leo is finally back, all is well. At least, until Rachel receives a vision about a child freeing monsters from their prison beneath a mountain and shattering an ancient barrier that had stood for hundreds of years. Will the monsters of Mount Ebott fall? Or will they manage to become friends? Rated T. Hopefully will cont. soon.

When Chara attempts to destroy the Universe, and barely alive sans manages to stop her, but in doing so he accidentally sends them across Universes to one where Gods are alive, Their children are prospering, and a prophecy is looming above, Titans hold the sky, and Sans? He is reborn in this universe. Authors Notes: PERCABETH WILL EXIST, DONT WORRY. YOUR SHIP IS SAFE.

This isn't what was supposed to happen...He never wanted any of this. Now Sans has to drop his lazy-bones disguise and become something he never wanted to be, in order to save the ones he loves. Now that humans are falling quicker then ever before, those "Half-Bloods" will never know what hit them. ((Contains Character Death. Godlike!Sans)

Frisk has been sent by the Greek Pantheon to find and kill a person named Kratos, who has been killing gods and monsters all around the world. He knows he can't do it alone so he is recruiting those who can help him against the threat on the world. Can he do it with his new friends or will he have to use his 1ST friend Chara? (Male!Frisk) (SplitPersonalty Chara) (Frisk/Hestia)

When the son of Percy and Annabeth, the hero of time link a wanderer named Mona and a boy with a traumatic past join to save the multiverse, what will happen the past catches up to the future and fights break and threats to leave start to form, the band of misfit hero's must come to terms with there past to save the future what will happen when their enemy is more than the ordinary

A little crossover story of Percy Jackson and Undertale. I always wondered what it would be like if these universes crossed each other, so i decided to write about it. I hope you enjoy!

(NOTE: THIS STORY CONTAINS SPOILERS TO BOTH PERCY JACKSON AND THE OLYMPIANS and UNDERTALE. READ AT YOUR OWN RISK) The day that Percy Jackson was supposed to return to Camp Half-Blood for the summer, he finds himself somewhere he would never expect to be: underneath Daedalus's labyrinth in a place called the Underground.

Adara, a Demigod daughter of Apollo, hears rumours about Mt. Ebbot and is led on a journey that may cure her bitterness against the world. But only time will tell as she hates any and all monsters... Will she let her bitterness rule over and kill all monsters that get in her way? Or will she realize that fighting isn't necessary and end her spite to save these monsters?

This is a Percy Jackson and Undertale crossover. When Frisk emerged from the Underground, they thought they would finally be safe. But instead, they emerged into a world of stubborn gods, evil monsters, secrets, and demigod warriors who are trying to make sense of it all. I own none of the characters that are not O.C.s, and there are spoilers.

Percy Jackson thought that his life couldn't be any weirder. From being a demigod, he had been in very weird situations before. But when his parents got killed by a fire, and then he got adopted. He thought it wasn't really THAT weird until until he saw that it wasn't a mortal that was signing the adoption papers. Instead, she was a goat. A freaking goat. How would Percy cope to li

After hundreds of RESETS, Sans finally finds a way to stop Chara. However, these events lead to unforeseen consequences. Now finding themselves stuck in an entirely different universe, Sans and Frisk has to learn to survive in a new world where mythology becomes reality. However, they aren't the only ones who came along from the Undergound... Pacifist/Neutral!Frisk and Demigod!Sans

first story ever. first summary ever. Annabeth was sent as a diplomat to the monsters. Little does she know that the gods have other plans for the monsters and their allies. And they are willing to use whatever means necessary to achieve their goal, even make a deal with a certain demonic murderer... (rated T because I am paranoid.)

Separated from his family, Percy Jackson must find his way home. He encounters the freed monsters, too.

When a magical artifact gives Nico di Angelo back his memories of his past lives, as well as their powers, how will he cope with them? As well as dealing with the betrayal from the camps? With only Hazel, Frank, and the voices in his head, he must travel to find his past and attempt to stop a war between gods. Rated T for language

Sans, a monster with a human form, along with his younger brother Papyrus are the only survivors from the human they raid a boat but crash on an island. They meet Artemis and Apollo on the island of Delos. After they meet, They go with the twins to Olympus. How will the gods react to the powerful skeleton and his younger brother?

This was originally a small fic of snippets, all regarding how Frisk would fare in CHB- between demigods, monsters, and Greek deities, introduced to a lifetime of promised fighting and weaponry. Everything got thrown for a loop when an angry ghost finds their way to an interesting host.

When a silly prank takes a nasty turn, Nico finds himself falling into the underground. Trapped behind the magic barrier, and exhausted from the previous week's trip, Nico finds himself walking his way through the underground. Set right after the war with Gaea, Nico replaces Frisk on a true pacifist run. Lots of fluffy shenanigans.