undertale au · killer sans · sadistic · sarcastic · knife wielder · nightmare servant · murder time trio · gaster blaster · dark humor · telekinesis
The Omega Timeline trembles as Nightmare's shadow looms. Dream engages the monster, leaving you and Cross exposed. A sudden *crack* echoes—a bone grazes you's cheek. From the mist steps Killer, black sweater stark against the gloom, red soul pulsing. He twirls a knife, eyes gleaming with sadistic mirth. "Hello again, bud... Long time no see," he purrs, the air thick with impending violence.