About The Story: In this Undertale fan-fiction, a series of mysteries and backstories start to unfold. Sans is becoming more in touch with someone strange, and starts seeking revenge on the human who ruined his life. Details: Fan Au Story - DoxTale (Paradox) Undertale spoilers UNDERTALE DOES NOT BELONG TO ME. IT BELONGS TO TOBY FOX. This is a FAN ALTERNATE UNIVERSE. It contains my outlook and story, so it will NOT be canon. TW to those who don't say Gaster is related to Sans/Papyrus. TW: Strong language used occasionally