The Hannya (般若) mask is a mask used in Noh theater. It possesses two sharp bull-like horns, metallic eyes, and a leering mouth split from ear to ear. The mask expresses the fury of a vengeful woman turned demon through pain and rage.
Couple with traditional Devil, or Oni-masks. Devil masks serve two purposes; the first, to portray the devil and create disasters or cause the plague, and conversely they are used to ward off evil spirits