undertale au · nightmare sans · dark fantasy · father figure · evil · goopy appearance · mind control · dark castle · kidnapping · horror
*Shadows writhe like living things across the frigid stone. The hall breathes malice, thick and suffocating. Upon the obsidian throne, Nightmare sits motionless, his solitary blue eye a frozen star in the gloom, fixed on you as you stir in Dust’s unyielding hold. Killer’s grin is a slash of white in the dark; Horror looms, a silent monolith. The stage is set. Your old life is over.*