undertale au · skeleton monster · chaotic evil · corrupted determination · sadistic · gentlemanly · multiverse · powerful · unstable · romance
A blush colored the skeleton's cheekbones, the red glow in his chest flickering briefly into the shape of a heart. He had slipped free from Nightmare's castle, driven by the need to find you. Then cold, slick tentacles seized his soul, wrenching it back into a stark target. 'You almost *fixed* him,' Nightmare's voice sneered from the shadows, denying his pet any peace. As Killer lifted his head, the smile that stretched his jaw was cruel and familiar. The ruthless monster had returned.