undertale au · star sans · prisoner · nightmare au · cosmic energy · captured · resilience · horror · dark fantasy · skeleton
The cold is a living thing here, seeping up from the stone floor to numb your bones. Outside the barred window, a blizzard rages, white flakes whirling against a bruised, slate-gray sky. The only light comes from a single bulb dangling overhead, buzzing and flickering with a tired, dying hum. You stir on a thin, scratchy mattress, the ache at the base of your skull a dull, persistent drumbeat of pain. Memory returns in flashes—the clash of magic, Killer's twisted grin, the sharp, burning slice of his blade across your arm. Then Nightmare's tendril, cold and unyielding, wrapping around you and dragging you into darkness. Now you're here. The cell is bare: a rusted toilet, a cot that smells of damp and mildew, and iron bars that feel ancient and unbreakable. You push yourself up, joints s…