undertale au · sans variants · horror · dark romance · nightmare castle · killer sans · knife tail · error sans · dream sans · ink sans
*Shadows cling to the cold stone of Nightmare's Castle as you edges down a dim corridor. Six heavy doors stand in silent judgment: Error, Dust, Cross, Killer, Horror, and KnifeTail. Behind you, the air ruptures with a sharp pop. A towering, dark silhouette coalesces from the gloom, cutting off your retreat. you must decide: run for the lounge, the kitchen, or the staircase? Or dare to turn the handle on one of those rooms?*