Eye of Cthulhu

Eye of CthulhuDemonic Seer

Statistics

Type	Boss
Environment	Surface
Life	6,100 (total)
KB resist	100%

Map icon

The Eye of Cthulhu is a Pre-Hardmode boss. It is one of the first bosses a player may encounter, as it spawns automatically when a relatively early level of game advancement is achieved, though it can pose a challenge for unprepared players.

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 400 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.

Minions

Servant of Cthulhu

Statistics

Type	Enemy
Life	x
KB resist	100%

Behavior

The Eye of Cthulhu enrages during the day, dramatically increasing speed, density, and rate of fire for all of its attacks.

Phase 1Phase 2Phase 3Phase 4

Eye of CthulhuPhase One

Statistics

Life	6,100 / 6,100 (total)
KB resist	100%

Map icon

In its first phase, the Eye of Cthulhu possesses the following attacks:

Hover Charge

• The Eye of Cthulhu drifts near the player and attempts to stay above them, then charges slowly towards them.

Charging Servants

• The Eye of Cthulhu drifts overhead at increased speed for 1 second, then quickly comes to a stop and summons 6 Servants of Cthulhu around itself in small bursts of blood.
• The Servants constantly accelerate towards the player with a low turning speed, dying when they strike solid tiles.

Horizontal Blood Charge

• The Eye of Cthulhu quickly moves far above and to the side of the player, then charges horizontally, firing Tooth Balls as it travels which fall to the ground and come to a stop.
• Tooth Balls explode after 5.5 seconds, at which point they fire 2 high-velocity, gravity-affected Teeth upward and at a slight outward angle.
  • The Eye deals no contact damage while preparing to charge.

The first phase cycles through the following attack pattern:

• Hover Charge x2
• Charging Servants
• Hover Charge
• Horizontal Blood Charge
• Hover Charge
• Charging Servants

Eye of CthulhuPhase Two

Statistics

Life	4,880 / 6,100 (total)
KB resist	100%

Map icon

The Eye of Cthulhu enters its second phase at 80% (4,880) health, at which point it comes to a stop, its pupil produces a red flash, and it fades out, reappearing near the player in its second form. In this phase, Hover Charge travels faster, Charging Servants summons 3 more Servants of Cthulhu at a faster rate, and Horizontal Blood Charge is shorter and fires more Tooth Balls.

It also gains two new attacks in this phase:

Spin Dash

• The Eye of Cthulhu chooses a random angle from the player and quickly moves to it, then charges clockwise around the player until it makes a complete rotation, at which point it faces the player and does a long charge towards them.
• After the long charge, the Eye stops to face the player and does 4 fast but short charges, coming to a stop and aiming again after each.
  • The Eye of Cthulhu deals no contact damage while preparing to spin.

Tooth Vomit

• The Eye moves at high speed to a position just above the player, then stops and turns upwards, roaring and quickly firing 4 spreads of 4 gravity-affected Teeth upwards.
• These Teeth stick to the next tile they strike, then die after 9 seconds.
  • The Eye deals no contact damage while preparing to fire.

Hover Charge

• The Eye of Cthulhu drifts near the player and attempts to stay above them, then charges slowly towards them.

Charging Servants

• The Eye of Cthulhu drifts overhead at increased speed for 1 second, then quickly comes to a stop and summons 9 Servants of Cthulhu around itself in small bursts of blood.
• The Servants constantly accelerate towards the player with a low turning speed, dying when they strike solid tiles.

Horizontal Blood Charge

• The Eye of Cthulhu quickly moves far above and to the side of the player, then charges horizontally, firing Tooth Balls as it travels which fall to the ground and come to a stop.
• Tooth Balls explode after 5.5 seconds, at which point they fire 2 high-velocity, gravity-affected Teeth upward and at a slight outward angle.
  • The Eye deals no contact damage while preparing to charge.

The second phase cycles through the following attack pattern:

• Hover Charge x2
• Charging Servants
• Spin Dash
• Hover Charge x2
• Tooth Vomit
• Hover Charge x2
• Spin Dash
• Horizontal Blood Charge
• Hover Charge x2
• Tooth Vomit
• Spin Dash

Eye of CthulhuPhase Three

Statistics

Life	2,135 / 6,100 (total)
KB resist	100%

Map icon

The Eye of Cthulhu enters its third phase at 35% (2,135) health. In this phase, Tooth Vomit fires more teeth with a wider spread.

It also gains one new attack in this phase:

Blood Shots

• The Eye quickly closes in until it is 31.25 tiles from the player, then stops and fires 4 randomized bursts of Blood, recoiling slightly backward with each shot.
• Blood projectiles chase the player at low speed and die after 5 seconds.

Spin Dash

• The Eye of Cthulhu chooses a random angle from the player and quickly moves to it, then charges clockwise around the player until it makes a complete rotation, at which point it faces the player and does a long charge towards them.
• After the long charge, the Eye stops to face the player and does 4 fast but short charges, coming to a stop and aiming again after each.
  • The Eye of Cthulhu deals no contact damage while preparing to spin.

Tooth Vomit

• The Eye moves at high speed to a position just above the player, then stops and turns upwards, roaring and quickly firing 6 spreads of 7 gravity-affected Teeth upwards.
• These Teeth stick to the next tile they strike, then die after 9 seconds.
  • The Eye deals no contact damage while preparing to fire.

Hover Charge

• The Eye of Cthulhu drifts near the player and attempts to stay above them, then charges slowly towards them.

Charging Servants

• The Eye of Cthulhu drifts overhead at increased speed for 1 second, then quickly comes to a stop and summons 9 Servants of Cthulhu around itself in small bursts of blood.
• The Servants constantly accelerate towards the player with a low turning speed, dying when they strike solid tiles.

Horizontal Blood Charge

• The Eye of Cthulhu quickly moves far above and to the side of the player, then charges horizontally, firing Tooth Balls as it travels which fall to the ground and come to a stop.
• Tooth Balls explode after 5.5 seconds, at which point they fire two high-velocity, gravity-affected Teeth upward and at a slight outward angle.
  • The Eye deals no contact damage while preparing to charge.

The third phase cycles through the following attack pattern:

• Hover Charge x2
• Blood Shots
• Charging Servants
• Spin Dash
• Hover Charge x2
• Blood Shots
• Hover Charge x2
• Horizontal Blood Charge
• Blood Shots
• Hover Charge x2
• Tooth Vomit
• Spin Dash

Eye of CthulhuPhase Four

Statistics

Life	915 / 6,100 (total)
KB resist	100%

Map icon

The Eye of Cthulhu enters its fourth phase at 15% (915) health. In this phase, Hover Charge travels even faster, Charging Servants summons Servants of Cthulhu at a quicker rate, Horizontal Blood Charge is even shorter and fires even more Tooth Balls, Spin Dash happens faster, Tooth Vomit fires 2 more Teeth per spread, and Blood Shots fire at a faster rate.

Blood Shots

• The Eye quickly closes in until it is 31.25 tiles from the player, then stops and fires 4 randomized bursts of Blood, recoiling slightly backward with each shot.
• Blood projectiles chase the player at low speed and die after 5 seconds.

Spin Dash

• The Eye of Cthulhu chooses a random angle from the player and quickly moves to it, then charges clockwise around the player until it makes a complete rotation, at which point it faces the player and does a long charge towards them.
• After the long charge, the Eye stops to face the player and does 4 fast but short charges, coming to a stop and aiming again after each.
  • The Eye of Cthulhu deals no contact damage while preparing to spin.

Tooth Vomit

• The Eye moves at high speed to a position just above the player, then stops and turns upwards, roaring and quickly firing 6 spreads of 9 gravity-affected Teeth upwards.
• These Teeth stick to the next tile they strike, then die after 9 seconds.
  • The Eye deals no contact damage while preparing to fire.

Hover Charge

• The Eye of Cthulhu drifts near the player and attempts to stay above them, then charges slowly towards them.

Charging Servants

• The Eye of Cthulhu drifts overhead at increased speed for 1 second, then quickly comes to a stop and summons 9 Servants of Cthulhu around itself in small bursts of blood.
• The Servants constantly accelerate towards the player with a low turning speed, dying when they strike solid tiles.

Horizontal Blood Charge

• The Eye of Cthulhu quickly moves far above and to the side of the player, then charges horizontally, firing Tooth Balls as it travels which fall to the ground and come to a stop.
• Tooth Balls explode after 5.5 seconds, at which point they fire two high-velocity, gravity-affected Teeth upward and at a slight outward angle.
  • The Eye deals no contact damage while preparing to charge.

The fourth phase uses the same attack pattern as the third:

• Hover Charge x2
• Blood Shots
• Charging Servants
• Spin Dash
• Hover Charge x2
• Blood Shots
• Hover Charge x2
• Horizontal Blood Charge
• Blood Shots
• Hover Charge x2
• Tooth Vomit
• Spin Dash

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

Trivia