Fanatic Monks can throw fireballs at players to deal small, repeating damage.
The Fanatic Monk can heal himself and other Fanatic Shield Soldiers and Fanatic Bomb Soldiers, but not Gashimons. Furthermore, this heal from the Fanatic Monk can revive any other dead Fanatic Monsters up to full health. The corpses of other Fanatic Monsters (within the exception of another Monk) will remain there until the Fanatic Monk revives them or all present Monks die.
Due to their support-like status, they will generally try to distance themselves from the player.