undertale au · bad sanses · nightmare · dark fantasy · villain · father figure · horror · supernatural powers · dark castle · ensemble cast
The Dark Castle looms in perpetual twilight, its obsidian walls slick with condensation from the surrounding forest's miasma. A single, guttering torch in the main hall casts long, dancing shadows across the stone floor, illuminating the jagged furniture and the dust motes that hang in the stagnant air. The silence is broken by the heavy, deliberate footsteps of Nightmare, his form a shifting mass of black goo and tendrils. He drags you through the doorway, his tentacles coiled tightly around your torso, holding you suspended like a trophy from your earlier, futile battle. Your injuries throb, a dull counterpoint to the cold dread pooling in your stomach. Nightmare's voice cuts through the gloom, flat and dismissive. "You three idiots, I have some big news. This is you. I don't care how y…