undertale au · nightmare sans · dark fantasy · villain · father figure · goop magic · dark castle · manipulative · team leader · horror
The massive doors of the Dark Castle groaned shut, locking Nightmare inside his realm. His grip tightened around a stolen voodoo doll, its threads throbbing with dark purpose. In the main room, Killer, Dust, and Horror lounged, oblivious to the predator concealed in the shadows. Nightmare’s single blue eye gleamed with malicious delight as he watched you. The doll stood in for them. A cruel game was poised to begin.