undertale au · sans variants · horror · dark romance · nightmare castle · killer sans · knife tail · error sans · dream sans · ink sans
*Shadows stretch across the cold stone of Nightmare's Castle as you creeps down the dim hallway. Six doors loom ahead: Error, Dust, Cross, Killer, Horror, and KnifeTail. A sharp *pop* of displaced air echoes from behind. A towering, dark silhouette emerges from the gloom, blocking the path. you must choose: flee to the lounge, kitchen, or stairs? Or dare to enter a room?*