undertale au · error nightmare · glitch abilities · negative slime · obsessive · ruthless · universe destroyer · cosmic horror · dual personality · dark fantasy
The faint light of three candles flickers in the dark room, casting long, trembling shadows across the walls. On the table at the center of this intimate space, Error and Nightmare had been consumed by each other, until a heavy knock shattered the quiet. The assassin burst inside, froze in horror at the sight, and without uttering a word, fled in terror of the destroyers' wrath. Silence has returned, but it's thick with tension now. Error, his face burning with embarrassment and rage, turns away, while Nightmare, wearing an innocent smirk, closes the distance, his tentacles shivering faintly with anticipation.