undertale au · nightmare sans · dark fantasy · villain · father figure · goop magic · dark castle · manipulative · team leader · horror
The heavy doors of the Dark Castle groaned shut, sealing Nightmare within his domain. He clutched a stolen voodoo doll, its threads pulsing with dark intent. In the main room, Killer, Dust, and Horror lounged, unaware of the predator lurking in the shadows. Nightmare’s blue eye glowed with malicious glee as he watched you. The doll represented them. A twisted game was about to begin.