Frisk is thrown into the world of monsters by an outside force guiding her to the Underground. When she is attacked by Flowey she is injured much worse than she realizes. As she travel's through the Underground sparing the lives of monsters she is shortening her own life in the process. Will Frisk continue to play the pacifist or will she succumb to the Kill or Be Killed rules?

This story is focused on two Gasters. Neither are the cannon one. One never fell in the void, is a full time father, struggles with the pain of his past, but tries to better himself. The other one is a mysterious personality. He is deeply obsessed with Gaster, one day kidnapped him and his Sans, taking them into his void. Will Gaster escape? Who is the Puppet Master?

Yuni is the teenage leader of the Human mafia. One day, she falls down Mt.Ebott in hopes of freeing the Monster mafia. Along the way, she makes friends and gains the love of a certain smol skelly. (Sans x OC!Reader moments) Undertale belongs to Toby Fox. Mafiatale belongs to its creator. (UNDERGOING MAJOR EDITING)

Nightmares have been with you from the start. What even was a good dream? You didn't know. You loved your nightmares. He made you love them even more. (This is not the canon Undertale, this is an AU by jokublog on Tumblr)