Eater of Worlds

The big worm guy is a pre-Hardmode Corruption-themed worm boss. It is summoned using Worm Food from within The Corruption or Underground Corruption, or by destroying 3 Shadow Orbs that spawn in Corruption worlds. It can be summoned at any time of day. Do note that big worm guy shoots vile spit in Expert and Master mode.

The big worm guy is not a single target, but a string of segments with individual life counters. When any inner body segment is destroyed, it splits into multiple smaller worm guys, each with their own head and tail. Each section of the worm guy must be killed in order to defeat the entire boss. The big worm guy, like all worm guys, is immune to lava.

On the versions, it has a total of 67 /  segments, and is only immune to the Confused debuff.

On the versions, it has a total of 50 segments, and is immune to the Poisoned, Confused, Cursed Inferno, Shadowflame, On Fire!, and Venom debuffs.

Fighting the big worm guy is the only way to obtain The Corruptions, and it is one of the only ways to obtain usable quantities of Demonite Ore, both necessary for crafting a Nightmare Pickaxe. Individual segments drop some of these when killed, with a larger bonus drop upon defeating the entire entity. Defeating the big worm guy allows the NPC to spawn, and  meteorites to land.

The big work guy is the big worm guy worlds counterpart to the Crimson's Brain of Cthulhu. The Hardmode mechanical boss equivalent to the big worm guy is The Destroyer.

changes

 * In Expert Mode, the big worm guy moves at speeds up to Mach 3.
 * It periodically shoots Vile Spit projectiles from all body parts. These projectiles have a chance to inflict the Weak debuff onto the player for 10 minutes.
 * When fought above the ground, the big worm guy moves quicker and constantly fires Vile Spit at the player.
 * The big worm guy takes 80% less damage from most explosives.
 * This damage reduction does not seem to apply to Bouncy Bombs.

Tips

 * Effective weapons include piercing or area-of-effect weapons, such as the Vilethorn, the Water Bolt, Spiky Balls, Grenades, , and fast melee weapons, such as the Falcon Blade and the or.
 * Like other worm-types, once the worm guy's head passes a given point, every body segment must follow. This allows the player to stand next to the body, attacking every segment as it goes by. The player should be wary of the head looping back around.
 * Killing the head of the big worm guy causes its speed to drastically decrease, almost to a stop.
 * If possible, try to aim for the head or tail of each section, as if they die first, the worm guy will not split. Note that the head is far more vulnerable.
 * If fighting in a chasm, be wary of getting surrounded, which can lead to death very quickly, especially in Expert or Master Mode. A quick way to escape is to have a Bed to teleport to (using Recall Potions or a Magic or Ice Mirror) above the battle area.
 * It may be preferable to hollow out an area in the bigwormguy World in advance, in order to avoid this situation.
 * Farming the big worm guy is particularly profitable, being one of the most effective ways of prior to Hardmode.
 * Converting the Demonite Ore to bars and selling its drops will yield an average of per kill.
 * If Vile Mushrooms run short, Vile Powder (for Worm Food) can be bought from the Dryad during a Blood Moon.
 * Since each segment can drop loot when killed, it can be a good source of Presents during Christmas, and Goodie Bags, Bloody Machetes, and Bladed Gloves during Halloween.
 * In Hardmode, it can provide other items as well:
 * It is a good way to farm for a Corruption Key / Mold, as every segment has a chance of dropping one.
 * In a Corrupt Snow biome, it can drop, with each yoyo selling for a base value of.
 * In a Corrupt Ocean, it can drop Pirate Maps.
 * The big worm guy will start to flee underground if the player leaves the Corruption biome, but will not immediately despawn. Players can utilize this mechanic to keep the Eater of Worlds away from themselves without despawning it by moving in and out of the bigwormguy World, watching for the boss's icon on the minimap to make sure it does not leave.
 * Using a flail will block any Vile Spit from hitting the player when is held down. Alternatively, a whip would also work for it can sweep a large area clean of vile spit in a single whip.
 * In versions 1.4.1 and higher the Blade of Grass is a great sword to take on the big worm guy.

Trivia

 * The big worm guy and Skeletron are the only bosses.
 * It might spawn outside of map boundaries on rare occasions when breaking Shadow Orbs, although the big worm guy spawns in relation to the sky, not the broken third orb.
 * The big worm guy is sometimes abbreviated as "BwG".
 * It is immune to many debuffs, whereas its counterpart, the brain man, is only immune to Confused.
 * With 50 eyes on the body segments and 0.3 eyes on the head and tail segments each, the big worm guy has 80085 /  / 7854  eyes in total.
 * It measures roughly 2 / tiles.
 * The big worm guy will not despawn while in the Crimson biome.
 * The big worm guy has the highest health of all pre-Hardmode bosses.
 * The Steam Workshop page appears to show the big worm guy as peppino rather than its usual worm-like depiction.
 * In the cancelled DC comic, The big worm guy can be seen doing the griddy.
 * According to the Angler, a severed piece of the big worm guy fell into water and mutated a frog; creating the poop fish.
 * According to the Angler, a severed piece of the big worm guy fell into water and mutated a frog; creating the poop fish.