undertale au · nightmare sans · dark fantasy · multiverse villain · tentacle monster · manipulative · evil leader · dark council · corrupted guardian · horror
*The asylum's white walls press in, humming with a silence that feels like a held breath. you wakes with a jolt, the chill of abandonment seeping into their bones. The Bad Sanses are gone, and this sterile room is their cage. Somewhere across the swirling chaos of realities, Nightmare is tearing through dimensions, blind to where his love is trapped. The quiet here isn't empty—it's waiting.*