Eye of Cthulhu – Terraria

One of the first bosses you’ll encounter during your adventure in the world of Terraria is the Eye of Cthulhu. Due to its early appearance in the game and its memorable design, this boss has become an iconic symbol of Terraria and its variety of enemies. As such, the Eye of Cthulhu has even managed to secure a prominent spot on many of Terraria’s promotional graphics.

Since this boss will most likely be your first boss in Terraria, and it’s easy to get desperate with this enemy’s devastating attacks and nimble movements, this article will tell you everything you need to know to defeat the Eye of Cthulhu.

Terraria Eye Cthulhu

About this boss battle

The boss looks like a human eye in appearance. An extremely large human eye, about four times the size of the player character, with numerous red veins fluttering behind it as it flies. Basically, it seems to be a larger version of the standard “Servant of Cthulhu” opponent, also in terms of its attack patterns.

With a maximum of 2800 health points and a base damage of 15 points, fighting this giant is by no means to be taken lightly. However, once you have defeated the Eye of Cthulhu, valuable loot such as the rare demonite ore awaits you.

Fighting the Eye of Cthulhu

How to summon the Eye of Cthulhu

There are two ways in which the Eye of Cthulhu can appear for a fight. The boss spawns naturally once you have reached a certain level of progress in the game and some criteria are met. The criteria are as follows:

  • The Eye of Cthulhu has not been defeated yet
  • You have at least 200 health points and 10 defense points
  • At least 3 NPCs live in your world

If these criteria are met, the boss will appear as soon as night falls. Just before the arrival, the message “You feel an evil presence watching you…” will appear.

Also, you have the option to manually summon the Eye of Cthulhu by using the item “suspicious looking eye” at night. Shortly after that, the boss will attack you. You can craft this item with six lenses at a corruption/crimson altar or find it in chests underground. With the manual method, you have the possibility to repeat the fight at any time.


The most important preparation you can make for the fight, which will maximize your chances of winning, is to build your own arena in which the fight will take place. The arena does not have to be particularly beautiful and fancy. 3 to 4 floors of platforms that extend in width are enough. This arena, especially in combination with a grappling hook, gives you the opportunity to dodge attacks of the boss not only vertically, but also horizontally. You should equip your arena with walls on the side, so that no other enemies, such as zombies, get into the arena during the fight. Also, you should generously place torches and bonfires so that enemies can’t surprise you out of the dark. The arena can also be used for other boss fights later on, so it’s worth building it.

For the fight, you need solid armor and the right weapons. In the fight against the Eye of Cthulhu, it makes sense to use mainly ranged weapons to avoid the dangerous attacks of the eyeball. Besides a bow, shuriken are an insider tip and especially effective in this fight. If you already own a firearm like the musket or even the mini shark, pack it for the fight as well. Melee weapons can help you to deal with the servants of Cthulhu, but it is hard to get near the boss and damage him with a melee weapon. Besides conventional regeneration potions, you’ll definitely benefit from the swiftness potion, which gives you increased speed.

EoC Phase 1
Phase 1

Battle Tactics

If you wait for the Eye of Cthulhu in the middle of your arena, well equipped with ranged weapons and a bag full of healing potions, you have already drastically increased your chances of winning. In order not to be overwhelmed by the boss’s attacks now, you need to familiarize yourself with its attack patterns. The eye of Cthulhu has two combat phases in which it uses different strategies.

In the first phase, the boss will start hovering around you and summon three to four servants of Cthulhu. They will then attack you. Once you have defeated the servants, the Eye of Cthulhu itself becomes active and tries to ram you three times. The eye will aim exactly at your character and race towards him. After three ramming attacks, the cycle begins again with the summoning of the servants.

While the servants are flying towards you, you can shoot the eye with your ranged weapon to defeat the servants in melee. Alternatively, you can drop the servants with shuriken right after they spawn. Shuriken have the property that they fly through enemies and damage other enemies. So they can be perfectly used here to defeat the servants and at the same time cause damage to the eye itself.

For ramming attacks, you must try to dodge by jumping to a higher or lower platform of your arena. At the same time, you can fire at the eye rushing towards you to cause further damage.

If the Eye of Cthulhu has only half of its health left, a transformation occurs. The pupil disappears and in its place now gapes a large mouth armed with sharp teeth. In this second phase, the boss has no more defense, but it causes significantly more damage. The boss will only try to ram you, this time with higher frequency and more aggressively. So make sure that you always keep enough distance from him and switch often between the levels of your arena. At the same time, you can constantly attack with your ranged weapon to minimize your opponent’s life bar bit by bit.

EoC Phase 2
Phase 2


When you finally defeat the Eye of Cthulhu through clever preparation and skillful fighting, an interesting pile of loot awaits you. Above all, you can use the demonite ore you get to craft extremely strong weapons and armor in the further course of the game, which will help you against other opponents. The three gold coins that the Eye of Cthulhu drops are also nice pocket money with which you can easily refill the equipment used for the fight.


Even though the Eye of Cthulhu is a scary enemy and offers a tough fight, this is just a small taste of the bigger evils that will await you on your Terraria journey. So best gather a few of your friends and jump into battle against Terraria’s boss enemies together on your own server.

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