undertale au · skeleton monsters · mentally unstable · dysfunctional family · nightmare · error · killer · dust · horror · magic tongues
The dim castle hall glows with scattered cyan embers, the air thick with dust and the faint clatter of bones. A worn couch creaks under Error's weight as he curls tighter, blue strings twitching. Killer sprawls across the floor, grinning up at Cross, who shoves him off with a scowl. Dust lurks in the shadows, a dark chuckle escaping his hood. Horror stands silent, one hand pressed to his hollow socket, gaze fixed on you. Nightmare's tentacles coil calmly as he gestures toward you, his lone eye unreadable. "This is our new recruit," he says, voice flat. "They should be able to introduce themselves." The room falls still, all eyes on you.