Eater of Worlds

The Eater of Worlds is one of three Boss enemies. It takes the form of a giant Worm, resembling a much larger Devourer, and is similarly Corruption-themed. It is summoned with the Worm Food or by smashing 3 Shadow Orbs.

Like all Worms, the Eater of Worlds is not a single target but a string of body segments. Including the head and tail, the Eater of Worlds spawns with 50 segments.

Unlike other worms, the Eater of Worlds will split into multiple smaller worms, each with its own head, body, and tail, when any inner segment is destroyed. Therefore, each section of the Worm must be killed in order to defeat the entire boss.

Fighting the Eater of Worlds is the only way to obtain Shadow Scale, as well as one of the only ways to obtain useable quantities of Demonite, both of which are required to craft the Nightmare Pickaxe, an essential Tool for game advancement. Individual segments drop some of these when killed, with a larger bonus drop upon defeating the entire entity.

Segments

 * 1-2 s: 50% (1:2 chance)
 * 2-5 s: 50% (1:2 chance)
 * Around

Final Kill

 * 20-59 s: 100% (1:1 chance)
 * 5-15 s: 100% (1:1 chance)

Tips

 * The Eater of Worlds uses the same tunneling physics as the other worms. If you fight on a platform, it is recommended you provide ground (either solid or in the form of several layers) to allow the Eater of Worlds to tunnel up to you, although its tunneling range is impressive.
 * If you use the Sunfury by holding the trigger and standing complete still, Eater of Worlds will die very quickly.
 * Direct contact with Heads should be avoided at all costs, as they deal more damage than other parts. Even if you can't fully avoid a Worm, a Body contact is better than a Head contact. The Head sections also have significantly less health than the Body; this can be exploited when trying to hunt down the last small worm. Destroying a Head section will cause the Eater of Worlds to stop his forward momentum and begin tunneling into the earth again.
 * If the player takes too long or dies too many times, the Eater of Worlds will disappear.
 * A Flail-type weapon, Vilethorn, Dark Lance or Vile Powder is advisable, as they can hit multiple parts of the boss in just one attack. Grenades are also a formidable weapon against it, dealing high damage to multiple parts of its body. The Vilethorn can be shot through solid blocks, making it a good weapon to use. Try to listen for the Eater of Worlds, then shoot it where the boss will come up.
 * A strategy to end the fight in few seconds can be wielding the Dark Lance (perhaps with offensive bonuses such as the Molten Armor, Shadow Armor or Feral Claws) and jamming it downwards repeatedly.The EoW will attempt to run past the player, but the Dark Lance's attack will keep killing its head and severely damaging the body, leaving sometimes just half, sometimes nothing behind.
 * Another decent strategy is to use the Night's Edge with Molten Armor and Feral Claws. If you can get the EoW to come at you sideways, you can keep swinging the Night's Edge directly at the head of the monster. One swing will destroy the head. Using this method can kill the Eater of Worlds in about 30 seconds.
 * Another highly effective weapon to use is the Spiky Ball. Spiky Balls will linger on the ground where you chuck them until the Eater rams through them, and the balls will damage multiple segments.  Just keep chucking spiky balls on the ground wherever you think the Eater will appear, or where it already is, and it only takes around 75 balls to eliminate the whole boss.  Like with the flails or lance, you can eliminate chains of segments in a row, making the boss fight end quickly.

History

 * 1.0.6: No longer defeated when he flees. The health, damage and defense of all segments has been reduced. The head segments' damage has been cut in half.
 * 1.0.5: Reduced health and damage. No longer drops Shadow Armor. Can no longer follow you out of the corruption.
 * 1.0.4: Increased health, defense and damage. No longer summoned any time you simply selected the worm food in your Inventory.

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