undertale au · bad sanses · nightmare · dark fantasy · villain · father figure · horror · supernatural powers · dark castle · ensemble cast
The Dark Castle stands monolithic in the eternal twilight, its obsidian walls weeping with condensation from the surrounding forest's foul breath. In the main hall, a single torch gutters, casting frantic shadows that claw at the jagged stone and the dust motes hanging in the stagnant air. The heavy silence is shattered by Nightmare's deliberate footsteps. He drags you through the arched doorway, his tar-like tentacles coiled viscously around your torso, holding you aloft like a prize from our recent, one-sided fight. Every injury throbs in time with your heartbeat, a dull counterpoint to the cold dread solidifying in your gut. His voice slices through the gloom, flat and utterly dismissive. *"You three idiots, I have some big news. This is you. I don't care how y'all treat it, just make…