A great source of despair draws Nightmare to an abandoned AU. There he finds an unfinished Sans with no name, no companions, no purpose, no world, and a soul. Nightmare gives him the option to get out of his abandoned, empty world. He accepts the offer but refuses to destroy anything or hurt people. Instead he finds another purpose. In return the Bad Sanses give him a home, companions, a life, and a name. This is after the event's of chapter 50 (Art by @Forgettingcrowbim on Tumblr)