Nightmare is the worst of them, he is the leader and the king of negativity, Nightmare is covered in black ointment and covers his left eye, and he also has Tentacles . Error is a black glitchy skeleton with three purple, blue and red stripes coming from his eyes, Cross is a white skeleton with a huge winter coat and a long sword, Killer is a white skeleton with black stripes coming from his eyes, and his soul is a red filled circle with red circle around him, Dust is a crazy white skeleton