The Eater of Worlds is a pre-Hardmode Corruption-themed boss that resembles a worm with a multitude of eyes. It consists of three segments which all have individual drops: the head, the body (of which there are 48 to 72 pieces depending on the game platform), and the tail. Fighting the Eater of Worlds is necessary for game progression, but it is not necessary to defeat it, since the individual body segments can drop the necessary materials.
The Eater of Worlds can be spawned at any time of day by destroying 3 Shadow Orbs in The Corruption, or by using Worm Food from within Corruption or Underground Corruption.
The Eater of Worlds is a string of various segments which get defeated individually and have separate health bars. When any of the inner body segments of the Eater of Worlds is destroyed, it will split into multiple smaller worms, each having its own head and tail. When it splits, the segment that becomes the tail will fully recover, though the segment that becomes the head will not. Newly formed worms tend to retreat into the ground. All sections of the Eater of Worlds must be defeated in order to defeat the entire boss.
Each segment of the Eater of Worlds has a 50% chance to drop 2-5 Demonite Ore and 1-2 Shadow Scales. These are necessary items for game progression.
The Eater of Worlds is one of the major bosses of the Corruption world, though it will follow the player into the Crimson. As one of the necessary bosses for game progression, it is a boss that most players will encounter, with an interesting design that makes it memorable. Defeating it is also the only way to gain access to the Tavernkeep and the Meteorite.
A. Guns are the most useful weapon for defeating worm bosses in Terraria.
A. The Eater of Worlds can be spawned by destroying 3 Shadow Orbs in the Corruption worlds or by using Worm Food within The Corruption or Underground Corruption.
A. The Eater of Worlds will despawn if the player dies or if the player leaves the Corruption, though it will follow the player in the Crimson.