The Fish (in-game name Eväkäs) is passive enemy that spawns in water on the surface and can sometimes inhabit the pools of water in the holy mountain along with the Suureväkäs. The amount of fish in this pond is dependant on your currect record of Orbs of True Knowledge collected before fighting the last boss.
The fish will move away from the player if you get near them and are unable to move if not in a liquid. They also can be seen attempting to avoid projectiles if they happen to come near them.
They die if exposed to concentrated mana