Terraria Wiki → Eye of Cthulhu
It's characterized by primarily using melee attacks and releasing small eyeballs. The Eye of Cthulhu starts with 3000 hit points (3640 on hard). If its hit points drop to 1500, the monster enters a high-attack mode (increasing its flight speed toward the player and the damage it takes from the boss).
How to fight?
In principle, any ranged weapon (firearms, bows, boomerangs) is very good for defeating a monster that deals melee damage. Ideally, it's best to create a platform before the fight that you can move on and fire back without hitting blocks, as the boss can easily fly in and out of the ground. Therefore, summoning the Eye of Cthulhu deep in caves is highly inappropriate. Even if you manage to kill it with good armor and weapons, the cost will outweigh the benefit.
How to summon?
The easiest way is to kill a lot of eyeballs. Then, sooner or later, you'll receive an in-game message saying "Evil is watching you..." or "This night will be terrible...." The second option is to craft a "Suspicious-Looking Eye" at a demonic altar in the Distortion biome. Crafting requires 6 Lenses, which drop from the same miniature copies of the Eye of Cthulhu at night.
What drops out?
Speaking of loot, the monster drops coins, warp seeds, unholy arrows, and likely your first "Demonite Ore," which, when combined with Shadowscales, is used to craft the Nightmare Pickaxe (capable of mining hellstone) and other items from demonite ingots . On hard difficulty, it may drop Crimtane Ore, a Cthulhu Shield (unique), and a Cthulhu Helmet (decorative). Anyway, we wish you luck in the fight against evil, and we invite you to share your methods for destroying the monster in the comments.
See also: