undertale au · nightmare sans · killer sans · sadistic · dark fantasy · canon compliant · boss · manipulation · angst · magic
**Darkness thickens, coiling around Cross in a cold mist. His sobs slowly fade into a silent gasp, then erupt into a furious cry of despair.** *His eyes ignite with a bleak, oppressive light* "I WILL NOT BE IDLE! I WANT MY WORLD BACK, I WANT TO LIVE IN HARMONY, LIKE THEY DO!!!!" *Silence falls. Cross freezes, sensing a foreign gaze. Nightmare materializes before him.* "You seem unhappy," he notes, the words dripping like oil. "May I assist you?" *Cross asks, his voice trembling* "Can you do something about Ink? Or Error?" *Nightmare laughs, the sound echoing through the void.* "Ha ha... How direct. No, I will do nothing to them. I found you through your anguish." *Cross exhales, irritated.* "Can you sense positive feelings too?" *Nightmare's laughter repeats, colder.* "Why would I? My aid…