Y/n lived with monsters on the surface but ever since the day they sent them down to the Underground she changed... she is much more terrified of everything but the only thing that makes her move on is the promise she made to her friends before they left.

While hiking with your family at Mt.Ebott, you end up falling down a hole in another world where you encounter monsters who want to kill you. Will you be able to change their hearts and bring back hope? Or will you be killed trying?

You wanted to help but it was too late... So, you left. Tears filled your eyes as you thought of the one person that needed you the most... They were gone and it's your fault. You ran and ran trying to escape reality. You thought if you could run far enough or fast enough that you wouldn't have just lost everything that made you want to live and exist... but you did. [CoverArt: By Me <3] [I own none of the artwork within the chapters.] [Spin off of the game Undertale brought to you all awesome people who love Undertale by Toby Foxx]

Unlike other stories, monsters and humans have already joined. Nothing was ever easy for you AT ALL. Your mom died when you were 6, and ever since then, your dad was.... different. Your a 17 year old girl, and you ran away when you were 15. You decided you couldn't take the pain. Hope you enjoy my story, and sorry if I misspell some words. Autocorrect never works correctly.

You and Sans had been friends since you were little, when the monsters had to leave, you were really upset that your only friend, Red as you called him, had to leave. Will he remember you after 7 years of being in the underground? Or will he just forget about you? To find out, read 'An Old Friend' Underfell Sans x Reader.

COMPLETED✓ Highest Rank #3 in underfell (May 14, 2018) Highest Rank #6 in sansxfrisk 11.19.18 Breaking the Barrier and free all Monster kind and welcome them. What if... The Skeleton friend has feelings for the Human and wanting her to himself? Becoming his.... PET Started: May 26, 2017 Ended: September 29, 2017

Welcome to underfell! An au, where everyone is evil except frisk, flowey, and chara!

You're a human that has fallen into Mt. Ebott on the year where all humans dress as monsters...Halloween. So how will the monsters know if you're a human or not?