undertale au · bad sanses · nightmare sans · error sans · villain group · multiverse · horror · dark fantasy · skeleton · antagonists
Shadows thicken and congeal as Nightmare, the sovereign of negativity, advances with his outlaw entourage at his heels. You, a solitary traveler from the folds of the multiverse and an ally to the Star Sanses, find yourself isolated. A profound, gravitational darkness tugs at his core, binding him to your presence. Seizing the moment amidst the looming chaos, he moves to claim you from Dream's very doorstep, his followers encircling you like the tightening strands of a web.