Eye of Cthulhu
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Map icon
| Type | Boss |
|---|---|
| Damage | Contact: 23 / 36  / 48  / 60  / 54  / 61 (Phase 2) 40 / 56 / 60 / 60 / 71 (Phase 3) |
| Max Life | 1500 / 3000 2535 / 3900 3510 / 4680 3231 / 4972 4475 / 5967 |
| Defense | 0 |
| KB Resist | 100% |
| Immune to |  |
| Coins | 10  |
|---|
- Item (Quantity)Rate
- Only in Corrupt worlds:
Demonite Ore (30-90)100%
Unholy Arrow (20-50)100%
Corrupt Seeds (1-3)100%- Only in Crimson worlds:
Crimtane Ore (30-90)100%
Crimson Seeds (1-3)100%- 100%
- 25% / 33.33%
- 10%
- 2.5%
Lesser Healing Potion (5-15)100%- 14.29%
- 10%
- 1%
The Eye of Cthulhu (Lore)(Always on first kill)100%
Treasure Bag(Eye of Cthulhu)100%
0x33's Aviators(In Master Mode only)100%
Suspicious Grinning Eye(In Master or Revengeance Mode only)25% / 25% 
Eye of Cthulhu Relic(In Master or Revengeance Mode only)100% / 100%
- If you were looking for the Eye of Cthulhu on the vanilla wiki, click here.
"In ages past, heroes made names for themselves facing such monsters."
The Eye of Cthulhu is a pre-Hardmode boss, fought anywhere during the Night.
While in Revengeance and Death Mode, the Eye of Cthulhu dashes more aggressively and more often as its health gets lower.
Spawn
The Eye of Cthulhu can be summoned manually using a Suspicious Looking Eye at night.
It also has a 1/3 (33.33%) chance of spawning automatically each night, if the following conditions apply:
- The Eye of Cthulhu has not yet been defeated in the current world.
- At least one player in the world has at least 200 maximum health and more than 10 defense.
- At least four town NPCs are present.
If spawning this way, its arrival is announced by the status message "You feel an evil presence watching you...". Once this message plays, the Eye of Cthulhu will spawn after 81 seconds. If the player is sufficiently far underground, the Eye of Cthulhu will not spawn until they return to the Surface. If they remain underground all night, the boss will not spawn at all.
Behavior
In Revengeance Mode
The Eye of Cthulhu has two phases and 4 sub-phases during phase 2, it can fly through blocks in all of these.
Phase 1
It attempts to float directly above the player, while spawning 3–4 Servants of Cthulhu which drop Mana Stars on death. Afterward, it charges at the player three times in succession, before repeating the cycle.
Phase 2
Upon reaching 75% health, the Eye will transform into its second phase. When this happens, it will spawn 4-5 Servants of Cthulhu. In phase 2 its defense will drop to 0, but its contact damage will increase to 48. In this phase it will do 3 normal dashes towards the player with a small break between each set of 3.
Upon reaching 65% health, it gains a rapid chain dash attack. During this subphase it will do 3 normal dashes and then 2-4 rapid chain dashes with a short delay before it repeats.
Upon reaching 55% health, it will no longer do normal dashes and instead does 5 rapid chain ones.
Upon reaching 40% health, it gains another new attack, a long horizontal dash which spawns many Servants of Cthulhu. During this phase it will do 4-6 rapid dashes and then a horizontal one.
In Death Mode
- Dashes faster and more often as its health decreases but also performs fewer chain dashes.
In the Boss Rush
- Max health increased to 450,000 / 585,000 / 731,250
- Sets the time to 7:30pm
Summons
| Type | Flying Enemy |
|---|---|
| Damage | Contact: 12 / 24 / 30 / 34 / 36 / 42 |
| Max Life | 8 / 12 / 15 |
| Defense | 0 |
| KB Resist | 0% / 10% / 20% |
| Immune to | |
Aftermath
- Harpies will begin dropping the Sky Glaze.
- The Acid Rain event may now begin naturally.
- Rotdogs begin spawning on the Surface at Night.
Tips
- For more elaborate strategies on defeating the Eye of Cthulhu, including weapon and arena recommendations, see Guide:Eye of Cthulhu strategies.
- Swiftness Potions, Sunflowers, Hermes Boots and their upgrades, and a Cloud in a Bottle and its upgrades or a Hook are all heavily recommended, as it will be near impossible to outmaneuver the Eye of Cthulhu's natural speed as well as dashes with just the player's base movement, especially on higher difficulties.
History
- 2.0.3.001: Nerfed health from 3050 / 3965 / 4758 / 5055 / 6066 to 3000 / 3900 / 4680 / 4972 / 5967 .
- 1.5.1.003: Now drops 10 .
- 1.5.1.001:
- Buffed health from 2800 / 3640 / 4732 to 3050 / 3965 / 4758 .
- It and its Servants of Cthulhu are now vulnerable to cold, sickness, and heat debuffs.
- Now drops Shield of Cthulhu regardless of world difficulty.
- Buffed health from 2800 / 3640
- 1.5.0.001:
- Buffed Revengeance Mode health from 4550 to 4732 .
- Nerfed Boss Rush health from 4,500,000 / 5,850,000 / 7,312,500 to 450,000 / 585,000 / 731,250 .
- Nerfed phase 2 defense from 6 to 0.
- Nerfed Revengeance Mode phase 3 and 4 defense from 6 to 0 .
- Servants of Cthulhu no longer drop Hearts in Revengeance or Malice Mode.
- No longer drops Victory Shards.
- Buffed Revengeance Mode health from 4550
- 1.4.5.004: No longer despawns and instead enrages when fought during the day.
- 1.4.5.003: No longer transitions into phase 2 at the start of the fight, and now charges faster and more often as its health decreases in Death Mode.
- 1.4.3.001:
- Nerfed Servant of Cthulhu's damage from 12 / 24 / 30 / 34 to 12 / 24 / 30 / 33 .
- Death Mode now causes it to move at highest speed immediately, instead of gradually speeding up as health lowers.
- Decreased charge frequency in Death Mode.
- Nerfed Servant of Cthulhu's damage from 12 / 24
- 1.4.2.105:
- Reworked Revengeance Mode AI:
- Now has a new phase where it charges straight horizontally at the player.
- Servants of Cthulhu no longer drop anything.
- Now spawns a flood of Servants of Cthulhu upon reaching 40% health and while lining up its horizontal charges.
- Now has several different charge patterns that it uses as it lowers in health.
- Now enters phase 2 at 85% health.
- Now enters phase 2 instantly in Death Mode.
- Reworked Revengeance Mode AI:
- 1.4.2.001:
- Nerfed Boss Rush health from 1,200,000 to 600,000.
- Nerfed Servant of Cthulhu's Boss Rush health from 120,000 to 60,000.
- Victory Shards now drop from the Treasure Bag instead of directly from the boss.
- 1.4.1.001:
- Buffed Boss Rush health from 600,000 to 1,200,000.
- Buffed Boss Rush damage modifier from 4x to 6x.
- Buffed Servant of Cthulhu's Boss Rush health from 60,000 to 120,000.
- Decreased phase 2's Revengeance Mode contact damage modifier.
- 1.4.0.001:
- Now starts rapidly charging upon reaching 50% health in Revengeance Mode instead of 25%.
- Now transitions into phase 2 upon reaching 90% health in Death Mode instead of 80%.
- 1.3.4.101:
- Buffed health modifier from 1.1x / 2.15x to 1.25x / 2.3x .
- No longer has 15% damage reduction.
- Buffed health modifier from 1.1x
- 1.3.4.001:
- Nerfed health modifier from 1.8x / 4.6x to 1.1x / 2.15x .
- No longer drops Lunatic Cultist (lore item).
- Nerfed health modifier from 1.8x
- 1.2.4.101:
- Buffed Death Mode health modifier from 2x to 4.6x .
- Increased aggressiveness as its health lowers in Death Mode.
- Buffed Death Mode health modifier from 2x
- 1.2.4.002: Buffed Revengeance Mode health modifier from 1.5x to 1.8x .
- 1.2.4.001: Teardrop Cleaver and Victory Shards now drop from the Treasure Bag instead of directly from the boss in Expert Mode.
- 1.2.3.002:
- Now gains a 2x health modifier in Death Mode.
- Now charges faster and more often in Death Mode.
- Now gains a 2x
- 1.2.1.001: Now increases Stress by 6 instead of 5 if it hasn't been defeated prior.
- 1.2.0.002: Servant of Cthulhu now inflicts Marked for Death for 3 seconds in Revengeance Mode.
- 1.2.0.001:
- Now gains a 1.5x health modifier in Revengeance Mode.
- Increased speed.
- Now inflicts Horror for 3 seconds in Revengeance Mode.
- Now has a 2% chance to drop Laudanum or Stress Pills in Revengeance Mode.
- Now gains a 1.5x
- 1.1.7.901: Increased Victory Shard drop count from 2-3 / 3-4 to 2-4 / 3-5 .
