True Eye of Cthulhu

True Eyes of Cthulhu are minions summoned by the Moon Lord.

Attack
The True Eye of Cthulhu will appear after either hand of the Moon Lord has been slain. They will orbit the Moon Lord and pursue the player, generating white balls of energy which they then fling at the player frequently. They also have a miniature beam similar to the Moon Lord's eyebeam that generates from his head, though the beam generated by the True Eye of Cthulhu is far easier to avoid.

it is also blue