The Destroyer

The Destroyer is a hardmode version of Eater of Worlds boss, which was introduced in the 1.1 patch. It is summoned using a Mechanical Worm. Unlike the Eater of Worlds, however, it can only be summoned at night, and it is not limited to the Corruption.

The Destroyer has a metallic-like body unlike Eater of Worlds which has a corrupted worm body. The Destroyer has red lights in its body, which are Probes that The Destroyer sends out. They are capable of firing lasers both from inside the Destroyer and detached from their master. If the light isn't lit up, that means Probe was already launched from that segment.

The Destroyer is a much different type of worm to fight unlike the others. His total health is shared throughout all segments of the body, not just one. The Destroyer also doesn't split like Eater of Worlds does (breaking into more segments of itself to fight the player), which means it will completely die when it's health reaches zero.

Due to its massive health, it seems almost impossible to kill The Destroyer without end-game weapons and/or multiple players.

When the Destroyer's health is low, it is recommended to wait until it's head is near or within sight of the player before killing it due to his drops coming out of its head. This means that the drops may possibly be lost somewhere underground or high in the sky, and considering that the Soul of Mights are not subject to gravity (just like the other souls), it may be difficult to find them if the players cannot keep track of his body links.