NPC
Eye of Cthulhu
- Boss
Bestiary entry
Rarity:
A piece of Cthulhu ripped from his body centuries ago in a bloody war. It wanders the night seeking its host body... and revenge!
- Time:
Nighttime - Achievements:
Eye on You, 
Slayer of Worlds - Spawns:
Servant of Cthulhu - Immune to:
Confused - Traits: Moves through blocks
- Bestiary search words:
eoc
Stats by game mode
| Classic | Expert | Master | Legendary (For the Worthy) | |
|---|---|---|---|---|
| Life | 2,800 | 3,640 | 4,641 | 6,188 |
| Attack | 15 | 30 | 45 | 80 |
| Defense | 12 | 12 | 12 | 12 |
| Knockback Taken | 0% (None) | 0% (None) | 0% (None) | 0% (None) |
| Coins |  3 | 7 50 | 750 | 1050 |
The last column is Master mode in a world made with the For the Worthy seed. Its numbers were measured in the game, not computed here.
For one player in a world before Hardmode. Expert and Master scale life, attack, knockback and coins by the game's own multipliers.
Coins: each kill rolls the coins from 80% to 175% of this value, then rarer extra rolls can add more.
How to fight it
How it appears
- Summon item:
Suspicious Looking Eye. Use it at night. - Without an item: At nightfall before its first defeat: when a player has at least 200 max life and more than 10 defense and 4 or more town NPCs live, a 1 in 3 roll starts it. It comes after night time 4,860.
What beating it changes
- The
Dryad can move in.
Treasure Bag (Expert and Master): 
Treasure Bag (Eye of Cthulhu)
Drops
Classic
| Item | Quantity | Chance | Kills for 50% | Kills for 90% | Conditions |
|---|---|---|---|---|---|
 Corrupt Seeds | 1 to 3 | 100% | In a Corruption world, Classic mode only | ||
 Crimson Seeds | 1 to 3 | 100% | In a Crimson world, Classic mode only | ||
 Crimtane Ore | 30 to 90 | 100% | In a Crimson world, Classic mode only | ||
 Demonite Ore | 30 to 90 | 100% | In a Corruption world, Classic mode only | ||
 Unholy Arrow | 20 to 50 | 100% | |||
 Eye of Cthulhu Mask | 1 | 1/7 (14.3%) | 5 | 15 | |
 Eye of Cthulhu Trophy | 1 | 1/10 (10%) | 7 | 22 | Only when the enemy counts as a boss |
 Binoculars | 1 | 1/40 (2.5%) | 28 | 91 |
Expert
| Item | Quantity | Chance | Kills for 50% | Kills for 90% | Conditions |
|---|---|---|---|---|---|
| Eye of Cthulhu Trophy | 1 | 1/10 (10%) | 7 | 22 | Only when the enemy counts as a boss |
Also drops Treasure Bag (Eye of Cthulhu). See the bag for its contents.
Master
| Item | Quantity | Chance | Kills for 50% | Kills for 90% | Conditions |
|---|---|---|---|---|---|
 0x33's Aviators | 1 | 100% | |||
 Eye of Cthulhu Relic | 1 | 100% | |||
 Suspicious Grinning Eye | 1 | 1/4 (25%) | 3 | 9 | |
| Eye of Cthulhu Trophy | 1 | 1/10 (10%) | 7 | 22 | Only when the enemy counts as a boss |
Also drops Treasure Bag (Eye of Cthulhu). See the bag for its contents.
Chance is per kill. Kills for 50% and 90% is how many kills give that chance to see the item at least once.
Treasure Bag (Eye of Cthulhu) contents
The Treasure Bag drops in Expert and Master instead of most items above. Open it for:
| Item | Quantity | Chance | Kills for 50% | Kills for 90% | Conditions |
|---|---|---|---|---|---|
| Corrupt Seeds | 1 to 3 | 100% | In a Corruption world | ||
| Crimson Seeds | 1 to 3 | 100% | In a Crimson world | ||
| Crimtane Ore | 30 to 90 | 100% | In a Crimson world | ||
| Demonite Ore | 30 to 90 | 100% | In a Corruption world | ||
 Shield of Cthulhu | 1 | 100% | |||
| Unholy Arrow | 20 to 50 | 100% | |||
| Eye of Cthulhu Mask | 1 | 1/7 (14.3%) | 5 | 15 | |
| Binoculars | 1 | 1/30 (3.33%) | 21 | 68 |
