Eater of Worlds

The Eater of Worlds (or EoW) is one of eight boss enemies. It takes the form of a giant worm, resembling a much larger Devourer, and is similarly Corruption-themed. It is summoned by using Worm Food in the Corruption or by smashing 3 Shadow Orbs.

Unlike all other worms, the Eater of Worlds is not a single target but a string of body segments with individual life counters. 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. Including the head and tail, the Eater of Worlds spawns with 50 segments.

Fighting the Eater of Worlds is the only way to obtain Shadow Scale, which are required to craft the Nightmare Pickaxe and Shadow Armor. Defeating the Eater of Worlds also produces usable quantities of Demonite Ore. Individual segments drop some of these when killed, with a larger bonus drop upon defeating the entire entity.

Farming the Eater of Worlds is one of the most effective ways of making money prior to Hardmode. Mid- to end-game armor and weapons will make the fight easy, and selling its drops will yield 9 to 11 each time, on average.

History
Dévoreur de Mondes Eater of Worlds Пожиратель миров