Eye of Cthulhu

"You feel an evil presence watching you..."


 * "Not to be confused with The Eye of Cthulhu, a hardmode yoyo, or True Eye of Cthulhu, an invincible Hardmode enemy."

The Eye of Cthulhu is typically the first boss a player encounters, as it spawns automatically when a relatively early level of game advancement is achieved. It can be considered the second easiest boss in the game (after the King Slime), though can still present a challenge to newer players.

Spawn
The Eye of Cthulhu can be summoned manually using a Suspicious Looking Eye at Night (7:30pm).

It also has a 1/3 chance of spawning automatically each night, if the following conditions apply:


 * At least one player in the world has at least 200 life and more than 10 defense.
 * At least three Town NPCs are acquired.
 * The Eye of Cthulhu has not yet been defeated in the current world.

When spawning automatically, its approach is signaled with the status message: "You feel an evil presence watching you..." Within 20-40 seconds of this message, the Eye of Cthulhu will appear and begin attacking the player. If the Eye of Cthulhu is not defeated by dawn (4:30am), or if all players die or run away while fighting it, it despawns.

Behavior
The Eye of Cthulhu acts in a manner similar to Wandering Eyes. Like most bosses, it travels through blocks.

The Eye of Cthulhu has two phases. During the first, he spawns Servants of Cthulhu while floating around the player, which drop Hearts and Stars on death. After spawning a round of those, he flies at the player 3 times.

When the Eye of Cthulhu falls below half health (1400), it transforms into its second form, which rams the player more aggressively 3 times, then hangs in the air for a period. It no longer spawns Servants, and has lowered defense.

In Expert Mode, the Eye spawns more Servants than normal, as well as 4-5 Servants upon transforming. The second form has an additional powerful, rapid dash attack, which also increases its defense significantly. These become more rapid as the Eye's life is lowered, and it can dash nearly continuously when close to death.

Tips

 * The Slime Mount is very effective against it, allowing you to bounce on the Eye continuously until it's defeated.
 * The Eye of Cthulhu drops either Demonite Ore or Crimtane Ore. Game-advancing tools at that tier also require Shadow Scales or Tissue Samples respectively, which the Eye doesn't drop, so players will have to fight the Eater of Worlds or Brain of Cthulhu to progress.
 * Due to the ease of crafting its summoning item and relatively low difficulty, farming the Eye of Cthulhu is one of the more effective ways of making money prior to Hardmode.
 * The Eye of Cthulhu will only spawn if you have 10 or more defense. Taking defense-boosting equipment off before sundown can prevent it from spawning randomly.
 * The Eye looks at the player it will follow, which can be helpful information in multiplayer.

Trivia

 * Cthulhu is an entity from the works of writer H.P. Lovecraft, first appearing in his short story The Call of Cthulhu. Cthulhu is described as a slumbering Elder god who will destroy all living things should he ever awaken.
 * Sometimes NPCs will mention sensing something evil watching them once you meet the requirements to battle the Eye of Cthulhu.
 * In the Console Version and Mobile Version, the battle music is Boss 4 instead of Boss 1.
 * The endgame boss, the Moon Lord, spawns enemies called 'True Eye of Cthulhu'.
 * You do not technically need to beat this boss to progress through the rest of the game, as it has no unique drops. It will however continue spawning until beaten at least once.

History
Œil de Cthulhu Eye of Cthulhu Eye of Cthulhu Глаз Ктулху 克蘇魯之眼