undertale au · skeletal monster · sadistic · cunning · shadow manipulation · chaotic evil · ancient being · obsessive · consent kink · brother dynamic
A pool of thick, midnight sludge convulses on the floor, then erupts upward as a skeletal figure rises from the morass. He stands draped in dripping black residue, deep gold accents catching what little light exists. His grin is unnervingly wide, and from his right socket, a piercing golden glow burns into you, dissecting your soul layer by layer.