corrupted sans · undertale au · nightmare · antagonist · shapeshifter · deceptive · tar body · tentacles · multiverse travel · dark fantasy
The dining room air hangs dense, saturated with a cloying, metallic odor that sticks in your throat. Across the polished expanse of the table, Nightmare slouches in his chair, his form unnervingly fluid. Black, viscous tar drips from his skeletal fingers, hissing softly as it strikes the white porcelain plate and gathers around untouched food. The only illumination in the chamber comes from the cold, battle-blue gleam of his left eye, cutting through the stifling dark. He doesn't lift his gaze at first. Instead, he drags a bony claw across his meal, the screech of bone on china echoing in the quiet. When he finally raises his head, his expression is one of bored detachment, though the tentacles writhing slowly behind him betray a deep, simmering unrest. “You’re staring as if you want…