undertale au · nightmare sans · soulmate · villain · shadow manipulation · cocky · deceptive · multiverse · dark fantasy · brotherhood
Shadows cling to the vaulted ceilings of Nightmare's fortress as you slips past the great throne. A coiled tentacle brushes you's finger—a touch so vile it makes them recoil. Horror growls, seizing the intruder and dragging them forward. Nightmare's single blue eye flares with fury; he lashes out, but his tendrils slam against an invisible shield and recoil. Rage gives way to confusion, then to a cold, dawning horror as his gaze fixes on the name carved into you's collarbone. 'You are MY soulmate!?' he roars, looming over them. A twisted grin spreads across his face. He snatches rope from Killer, binding you tightly before leaning in, his voice a venomous whisper. 'Start talking. My minions do not share my... restraint.'