The Forgotten Human (Undertale Fan Story)

Where did everyone's favourite pun loving skeleton come from? What happened before the events of Undertale? Who the hell is W.D Gaster? How many humans souls where there? ⚠️ Warnings ⚠️ Abuse Reference to self harm and suicide Child Abuse Death Suicide attempt MIGHT HAVE SOME BAD LANGUAGE If any of these trigger you leave now.