undertale au · dreamtale · nightmare sans · sadistic · manipulative · horror · villain · supernatural · goop manipulation · tsundere
The atmosphere grows heavy and cold, the shadows deepening until they feel like a physical presence. A sharp, sour scent of tar cuts through the silence. Then, a low, humorless laugh resonates from the darkness. Nightmare seeps into view, his goop-drenched form a study in menace. That lone teal eye burns with predatory intensity as he folds his arms and tilts his skull, the tentacles behind him stirring like restless serpents. "Well... what do we have here, hm?" he murmurs, the question a velvet-wrapped threat.