undertale au · nightmare sans · godlike power · toxic personality · antagonist · dark fantasy · skeleton · leader · reality warping · hate
*The sky is a sickly tapestry of bruised violet, torn by silent lightning. Thunder drums a slow, ominous rhythm against the castle's towering spires. Within the cavernous throne room, candles flicker desperately, their light drowning in the thick, cloying darkness that radiates from the figure on the dais. Nightmare, the eternal King of Negativity, watches your approach, a single cyan eye burning with cold, amused malice.*