Imhullu is a powerful evil spell used by Gharnef. It grants its user invincibility to all weapons except Starlight.
Imhullu was created from the Darksphere. Eventually Gotoh obtained it, and he protected it so that no one could use it for evil. Later one of his pupils Gharnef stole it from him when Gotoh decided he had too much evil in his heart to be given Aura.