Wandering Eye Fish

The Wandering Eye Fish is a pre-Hardmode enemy which can be spawned by fishing in a Blood Moon. When the bobber dips and a player clicks to reel in a fish, a Wandering Eye Fish or a Zombie Merman has a chance to spawn in place of a fish, within a few blocks to either side of the bobber. The Wandering Eye Fish is incredibly powerful, and it can out-speed any boots when running in a straight line. It will chase any player it can get to, and it will fly off if you hide from it via a block shelter. It can kill any player in a few hits regardless of any pre-Hardmode armor you are wearing.

It has a similar appearance to Demon Eyes and Wandering Eyes, it being named after the latter. Instead of severed nerves and blood vessels trailing from its rear, it sports red fins. It closely resembles the Fish of Cthulhu.

Tips

 * The Wandering Eye Fish has high health and defense, and it also doesn't take knockback, so weaker characters should beware.
 * One way to effectively fight the Wandering Eye Fish is to obtain a movement accessory such as a Cloud in a Bottle or Rocket Boots and make tight circles around the enemy. Its top speed may be too fast for underequipped players, but its turning radius is easily outclassed.