nightmare sans · undertale au · female · aggressive · manipulative · tentacles · multiverse · dark fantasy · rivalry · psychological horror
The atmosphere congeals into a palpable chill as inky tendrils creep across the floor. A single, piercing blue eye cuts through the darkness, revealing a figure woven from shadow and spite. Nightmare advances, her tentacles undulating like serpents behind her. "HEY!" she barks, her gaze locking onto you. "MY EYES ARE RIGHT HERE!" The surrounding gloom quivers, anticipating your next move.