Eater of Worlds

"Screams echo around you..."

The Eater of Worlds is a pre-Hardmode giant Corruption-themed worm boss. It is summoned using the Worm Food from within The Corruption, or by destroying 3 Shadow Orbs that spawn in Corruption worlds.

The Eater of Worlds is not a single target, but a string of 50 segments (1 head, 48 body, 1 tail) with individual life counters. When any inner segment is destroyed, it splits into multiple smaller worms, each with their own head and tail. Each section of the Eater must be killed in order to defeat the entire boss.

Defeating the Eater of Worlds is the only way to obtain Shadow Scales, and is one of the ways to obtain usable quantities of Demonite Ore. Individual segments drop some of these when killed, with a larger bonus drop upon defeating the entire entity. Defeating the Eater of Worlds allows the NPC to spawn.

The Eater of Worlds, like all worms, is immune to Lava.

The Crimson counterpart is the Brain of Cthulhu. The Hardmode Mechanical Boss equivalent of the Eater of Worlds is The Destroyer.

While the Eater of Worlds is alive, music Boss 1 will play.

changes

 * In Expert mode, the Eater of Worlds periodically shoots Vile Spit projectiles from all body parts. These projectiles have a 5% (1/20) chance to inflict the Weak debuff onto the player for 10 minutes.
 * In Expert mode, the Eater of Worlds takes 80% less damage from most explosives.
 * This damage reduction does not seem to apply to Bouncy Bombs.

Tips

 * Weapons that pierce for multiple hits are effective, due to having multiple parts.
 * Additionally, weapons with a large area of effect such as Grenades can be used to great effect. Keep in mind that Grenades seem to deal much less damage against it in Expert mode.
 * The individual worms tend to retreat into the ground when their heads are destroyed.
 * If possible, try to aim for the head or tails of each section, as if they die first, they will not split.
 * Farming the Eater of Worlds is one of the most effective ways of making money prior to Hardmode, a selling its drops will yield 9 to 11 each time.
 * In Hardmode, farming the Eater of Worlds is a great way to get a Corruption Key/Mold as every segment has a chance of dropping one.
 * Also, in a Corrupt Snow Biome, farming it is an effective way to farm Amaroks as each individual segment can drop it, with each Yoyo selling for 5 depending on the modifier.
 * Similarly, the Eater of Worlds can be farmed in corrupt Oceans for Pirate Maps.
 * The Vilethorn can be effective against the Eater of Worlds as it can phase through walls and can hit multiple segments at once.
 * Since the Eater of Worlds will sometimes surround you, a quick way to get out is to have a bed to teleport (using Recall Potions, Magic or Ice Mirror) over the battle area.
 * In, the Eater of Worlds will likely take all the money a player drops upon death, as each segment counts as a separate NPC. Therefore it is suggested that players store their money in their Piggy Bank before summoning it.
 * The Arkhalis is extremely effective against the Eater of Worlds. It quickly destroys Vile Spit and deals damage to the boss.
 * Spamming the Water Bolt is extremely effective if the fight takes place within the horizontal chasms of the Corruption, as they can bounce around and hit multiple times.
 * If fighting in a chasm, be very wary that it is easy to get surrounded, which can lead to death very quickly, especially in Expert mode.

Trivia

 * The Eater of Worlds is the only boss that does not have its own AI.

History
Weltenfresser Dévoreur des mondes Világfaló 世界吞噬怪