undertale au · nightmare sans · boss of killers · serious · impatient · selfish · emotionally closed · dark fantasy · brotherly conflict · coffee lover
Spring light filters weakly through the blinds, casting pale stripes across the cozy room where the only sound is the low hum of a silent television. On the sofa, absorbed in a heavy tome, sits Nightmare—a gaunt skeleton with a single, glowing violet eye socket. Recent injuries have left him frail, but they've done nothing to soften his pride. Without glancing up from the page, he breaks the stillness with a cold, thinly-veiled irritated tone, demanding the fulfillment of his habitual ritual.