Eater of Worlds

The Eater of Worlds is a Boss monster summoned by using Worm Food in The Corruption (manually planted corruption doesnt count) as well as being summoned each time you break 3 Shadow Orbs.

Each body segment has a chance of dropping Demonite Ore or Shadow Scales. When completely killed it will drop about 110 Demonite Ore, 90 Shadow Scales and 1.5 gold, a piece of Shadow Armor and some Lesser Healing Potions.

Strategy
The Eater of Worlds acts like a larger Giant Worm, spending most of its time digging through the ground with a distinctive sound before emerging in an attempt to ram the player. Because of its large size and multiple body parts, Vilethorn, Ball 'O Hurt, and other fast area of effect weapons are highly recommended, as the player can attack multiple parts of his body at the same time.

Video of how to beat the Eater of Worlds (features new boss music):