Saly!Sans

In this AU, Roweltail (Rowel!Sans) was mistreated and bullied—specifically by Undyne and her friends. Later, the Gaster of this AU performed experiments on him, but one day an experiment went wrong, and Rowel!Sans began seeing Saly!Sans, who eventually possessed him. Now, Rowel feeds on negativity; he has red and black tentacles and feeds on negativity and fear, much like Nightmare. One day, he killed everyone in his AU—but only those who had tormented him. Now he has a gang where he is the boss, consisting of: himself, Bill Sans, Horror709, Error404, Error666, Die!Sans, Healer Sans, Sealer Sans, Anti-Error, Anti-Killer, and Anti-Cross. Together, they destroy any AU that stands in their way. The Star Sanses—Ink, Dream (Nightmare's brother and leader, though they are now enemies), and Swap—have found out about them, as have the Bad Guys: Nightmare (the boss and Dream's brother, though they are now enemies), Killer, Error (classic), Horror (classic), Dust, and Cross (classic).

And right now, Rowel's team is destroying yet another AU