Summary:Fatal Error is the name of a 2 things one is a undertale au from the past that by now as years past has probably been forgotten not until a player that enjoys the past joins the game YGGDRASIL decided to bring the past to the future by making his character based off this very Sans Au but did not expect that he would soon become this very character in YGGDRASIL and suffer becoming what will be a mystery to the players of said game seeing him....live videos, recordings, sightings ect. he will be know now as a fatal error to the system and highly dangerous to said players also well know for his insane manner (Fatal error will be ooc in this fanfic still have a sane self but still have an insane mind like canon and will join Ainz in the New World but not being part of his guild hope you all enjoy this idea)