Vengeful Eye of Cthulhu

Info
Summoned by using the Suspicious Looking Eye during Hardmode in the reverse realm. The Vengefull Eye of Cthulhu looks very much like the Eye of Cthulhu, but in black and grey. He will trail green fire, also known as Cursed Flames, though this is a purely visual effect. The Eye has much the same behavior as the pre-hardmode eye, save for a number of new attacks.

The Vengefull Eye of Cthulhu, much like its pre-hardmode predecessor, is a two stage boss. In the first stage, he will release Servants of Cthulhu and occasionally burst blocks of cursed flames.

In all other ways, he acts like the Eye of Cthulhu, including flying back and forth around the player, dodging above and below the ground.

The second stage Vengefull Eye will lose its iris, showing its mouth and teeth. Like the original Eye, it gains more damage at the cost of defense, but unlike the Eye, it has more attacks. The second stage of the Vengefull Eye will attempt to drop boulders onto the player, which can quickly kill unsuspecting or slow players. This, in addition to the original Eye's charging attacks, can make a formidable boss.

To fight the Eye, it is recommended to keep yourself both at a fair distance and in flight. Remaining in close range during the first stage puts you at risk of being caught in the burst of flames, and being close in the second stage puts you in danger of his increased damage and his boulders. Standing on the ground makes you slower, and puts you in danger of the boss's boulders during his second stage. after killing the Vengeful Eye Of Cthulhu it may drop a phaseblade fighter chestplate.

Trivia

 * Vengefull is assumed to be a typo. The proper spelling Vengeful, with only one L.
 * Two Vengefull eyes will spawn at once when summoned. It is assumed that he is meant to mimic the Twins in this way.