Eater of Worlds Terraria boss · Pre-Hardmode · #3 in the usual order

Eater of Worlds in Terraria — Eater of Worlds

A giant worm made of many segments that burrows through the Corruption. Breaking a middle segment splits it into smaller worms, and every piece must die. It is the only source of Shadow Scales, which you need for the Nightmare Pickaxe.

Stage: Pre-Hardmode
Required?: Needed to progress
Summon: Worm Food
Where: The Corruption, any time
Max life: 10,050 (Classic)

Biome: The Corruption · Underground

Stats by difficulty

Stat	Classic	Expert	Master
Max life	10,050	15,120	19,224
Damage	Varies by segment

How to summon Eater of Worlds

Worm Food. Use Worm Food inside the Corruption, at any time. Craft it from 30 Vile Powder and 15 Rotten Chunks at a Demon or Crimson Altar. Smashing three Shadow Orbs also summons it.

Attacks and phases

Burrows through blocks and lunges out of the ground to ram you.
Splits into separate, smaller worms whenever a body segment is destroyed.
Expert: segments spit Vile Spit that floats toward you.

Strategy

Dig out or build a wide open area in the Corruption before the fight so you don't get boxed in.
Piercing and area weapons shine here: Spiky Balls, Grenades, whips and the Vilethorn.
Hit the head or tail of each worm when you can, since that kills it without splitting.
Stand next to the body as it passes and let every segment run through your attacks.
Do not leave the Corruption or it will start to burrow away.
A bed above the area plus a Magic Mirror or Recall Potion is a good escape plan.

Recommended weapons

Melee

Blade of Grass or Light's Bane

Ranged

Spiky Balls, Grenades or the Minishark

Magic

Vilethorn

Summoner

Flinx Staff with the Snapthorn

Armor and gear for each stage.

Drops

Item	Qty	Chance
Shadow Scale	0–134/0–100	100%
Demonite Ore	20–395/20–310	100%
Eater's Bone	1	5%
Lesser Healing Potion	5–15	100%
Eater of Worlds Mask	1	14.29%
Eater of Worlds Trophy	1	10%

Expert and Master Mode extras

Worm Scarf Expert · 100%

Writhing Remains Master · 25%

Eater of Worlds Relic Master · 100%

Classic Mode rates. In Expert and Master Mode most loot comes in a treasure bag , which also holds the Expert-only Worm Scarf.

After you beat Eater of Worlds

Shadow Scales and Demonite Ore for the Nightmare Pickaxe (needed to mine Hellstone) and Shadow armor
The Tavernkeep can arrive, which opens the Old One's Army event
Meteorites can start to fall

Did you know? It has the highest total health of any pre-Hardmode boss.

FAQ

How do you summon Eater of Worlds in Terraria?

Use Worm Food inside the Corruption, at any time. Craft it from 30 Vile Powder and 15 Rotten Chunks at a Demon or Crimson Altar. Smashing three Shadow Orbs also summons it.

How much health does Eater of Worlds have?

10,050 in Classic, 15,120 in Expert and 19,224 in Master Mode.

What does Eater of Worlds drop?

Shadow Scale, Demonite Ore, Eater's Bone, Lesser Healing Potion, Eater of Worlds Mask, Eater of Worlds Trophy, plus the Worm Scarf from the Expert Mode treasure bag.

What should I use against Eater of Worlds?

Melee: Blade of Grass or Light's Bane. Ranged: Spiky Balls, Grenades or the Minishark. Magic: Vilethorn. Summoner: Flinx Staff with the Snapthorn.

Sources & picture credits

Guide text is original retrogameindex writing, checked against the Terraria Wiki. Boss statistics and drop rates are the game values shown in the Terraria Wiki’s infoboxes. Sprites and artwork © Re-Logic; local copies archived from Terraria Wiki file pages (listed on the image gallery).