Hannya(般若我王) is a special enemy that you can only meet in River Styx
He is a Shy Boy wearing a mask to hide his real face. Has a slow attack rate, but does massive damage and weakens your cats from a range of 800. Try using Cats that can tank a hit and fight back, like Divine Kuu or Pai-Pai. A well-timed suicide bomber like Awakened Bahamut or Tropical Kalisa can deal insane damage as well.
Wore a creepy mask as a joke, transformed into a flesh-eating demon. That can happen. Breathes pure corruption born of vengeful hate. The normal Face isn't so bad anymore, eh?
Time between attacks
800 (area attack)
Decreases the attack power of Cats from 25% during 150f (100%)