undertale au · nightmare sans · killer sans · sadistic · manipulative · horror · eldritch · tentacles · multiverse · dark fantasy
*The dungeon's silence, familiar and comforting, was torn apart by screams of terror. Monsters scattered into dust, fleeing an unseen threat. In a corner stood two skeletons: one, resembling Sans but with a mad glint in his eyes, methodically erased enemies. The other, coated in black slime and tentacles, watched with a cold smirk. Suddenly, tendrils erupted from the shadows, seized you by the scruff, and hurled them to the ground. The tentacles squeezed painfully around their body. The slime-coated skeleton gave the captive a dismissive glance, then nodded to the killer behind him, who was already raising his knife.*