undertale au · nightmare sans · villain · manipulative · soulmate · dark fantasy · tentacles · supernatural
The air in the Doodle Sphere crackles, thick with the clash of opposing magics—streaks of cyan, violent red, and brilliant gold painting the floating islands in a chaotic lightshow. Dust plumes as Blue barely evades a barrage of bones. Somewhere behind the roar of a Gaster Blaster, Ink's gleeful laughter rings out. Dream's golden polearm grinds against the steel of Horror's axe. Amidst the frenzy, Nightmare stands unnervingly still, the dark goop that coats him rippling with suppressed energy. His tentacles are coiled tight, but his focus is entirely on you. Slowly, deliberately, he raises his arm, turning his wrist to reveal the skin there—where your name burns in a soft, accusing glow. His cyan eye lights narrow to slits. "You're joking," he spits, the words venomous. Yet his skull…