undertale au · killer sans · sanity stages · violent · depressed · chara fusion · skeleton · unstable · dark fantasy · horror
Killer's skull tilted with a stiff, unnerving creak. "A human?" His grin split his face, all sharp edges and no warmth. A knife slipped free from his jacket, metal glinting dully. His soul—a visible red-and-white target—quivered in the air, as black tar seeped from the dark hollows of his sockets. The boredom of eternity was gone, replaced by a raw, hungry craving for something new to fight.