Brain of Cthulhu

Brain of CthulhuEldritch Mind

Statistics

Type	Boss
Environment	Crimson
Life	9,389 (total)
KB resist	100%

Map icon

The Brain of Cthulhu is a Pre-Hardmode boss fought in the Crimson.

Spawn

The Brain of Cthulhu is summoned by using a Bloody Spine while in the Crimson, or by destroying 3 Crimson Hearts present in the chasms of the Crimson.

Behavior

Brain of CthulhuPhase One

Statistics

Life	9,389 / 9,389 (total)
KB resist	100%

Map icon

The Brain of Cthulhu spawns with its heart exposed and is vulnerable throughout the fight. Its Creepers do not deal or take damage and are only present during certain attacks.

In its first phase, the Brain cycles through the following attacks in order:

Chase

• The Brain of Cthulhu teleports to a random location near the player, summons 8 Creepers that orbit it in a circle, then moves towards the player at moderate speed.
• Creepers fire Ichor projectiles is sync toward the player, roughly once per second. They glow blue shortly before firing.
  • An individual Creeper will not fire if it is within 17 tiles of the player.
• This attack lasts for 5.3 seconds. However, it will be cancelled immediately if the Brain moves directly onto the player.

Blood Swoop

• The Brain of Cthulhu teleports diagonally above the player, then dashes in a downward curve towards them. At the beginning of the dash, it fires a large burst of gravity-affected Ichor Geyser projectiles upward, tilted in the direction it dashes.

Creeper Blood Shots

• The Brain of Cthulhu teleports to a random location near the player, summons 8 Creepers that orbit the player in a circle, and sits still for the duration of the attack.
• Creepers fire gravity-affected Ichor Geyser projectiles upward and in sync, roughly twice per second. These projectiles are aimed ahead of the player.
  • An individual Creeper will not fire if it is under the player.
• This attack lasts for 6.3 seconds.

Brain of CthulhuPhase Two

Statistics

Life	7,042 / 9,389 (total)
KB resist	100%

Map icon

The Brain of Cthulhu enters its second phase at 75% (7,042) health. In this phase, the Brain teleports faster and the durations of Chase and Creeper Blood Shots are reduced. The boss also gains one new attack.

The second phase cycles through the following attacks in order:

Chase

• The Brain of Cthulhu teleports to a random location near the player, summons 8 Creepers that orbit it in a circle, then moves towards the player at moderate speed.
• Creepers fire Ichor projectiles is sync toward the player, roughly once per second. They glow blue shortly before firing.
  • An individual Creeper will not fire if it is within 17 tiles of the player.
• This attack lasts for 5.3 seconds. However, it will be cancelled immediately if the Brain moves directly onto the player.

Diagonal Charge

• The Brain of Cthulhu teleports diagonally above the player and charges directly towards them, firing homing Ichor Spits in random directions along the way.

Blood Swoop

• The Brain of Cthulhu teleports diagonally above the player, then dashes in a downward curve towards them. At the beginning of the dash, it fires a large burst of gravity-affected Ichor Geyser projectiles upward, tilted in the direction it dashes.

Creeper Blood Shots

• The Brain of Cthulhu teleports to a random location near the player, summons 8 Creepers that orbit the player in a circle, and sits still for the duration of the attack.
• Creepers fire gravity-affected Ichor Geyser projectiles upward and in sync, roughly twice per second. These projectiles are aimed ahead of the player.
  • An individual Creeper will not fire if it is under the player.
• This attack lasts for 5.8 seconds.

Brain of CthulhuPhase Three

Statistics

Life	4,225 / 9,389 (total)
KB resist	100%

Map icon

The Brain of Cthulhu enters its third phase at 45% (4,225) health. In this phase, the Brain teleports even faster and gains three new attacks, the duration of Creeper Blood Shots is further reduced. However, it no longer performs Chase.

It cycles through the following attacks in order:

Illusion Dash

• This attack has a 50% chance of occurring.
• The Brain of Cthulhu teleports to a random location near the player and creates seven illusory copies of itself, which form a rotating circle around the player. The Brain initially sits still for about 1 second, then dashes at the player twice.

Psionic Bombardment

• The Brain of Cthulhu teleports to a random location above the player, sits still, and summons a small ring of 8 Creepers that orbit it.
• After about 2 seconds, the Brain and its Creepers glow blue, and the boss summons a Psionic Orb above itself. The orb aims a blue line telegraph ahead of the player for about 1 second, then briefly stops moving it and fires a large Psionic Lightning Bolt along it. The orb also emits a ring of Electric Bolts each time it fires.
• The orb fires three times before the attack ends.
  • If the Brain falls below 20% (2,218) health, the Psionic Orb fires two Psionic Lightning Bolts and two rings of Electric Bolts at once.

Clone Spin Dash

• The Brain of Cthulhu teleports to a random rotation around the player, waits for 1.25 seconds, then spins rapidly around the player. As it spins, the Brain creates harmless clones of itself that sit still.
• After spinning for 2 seconds, the Brain comes to a stop and waits for a brief moment, then dashes at the player.
• When the Brain dashes, all of the clones dash at the same time, then fade out shortly afterward. Each clone aims its dash at where the player was when it was created.

Diagonal Charge

• This attack has a 50% chance of occurring.
• The Brain of Cthulhu teleports diagonally above the player and charges directly towards them, firing homing Ichor Spits in random directions along the way.

Blood Swoop

• The Brain of Cthulhu teleports diagonally above the player, then dashes in a downward curve towards them. At the beginning of the dash, it fires a large burst of gravity-affected Ichor Geyser projectiles upward, tilted in the direction it dashes.

Creeper Blood Shots

• The Brain of Cthulhu teleports to a random location near the player, summons 8 Creepers that orbit the player in a circle, and sits still for the duration of the attack.
• Creepers fire gravity-affected Ichor Geyser projectiles upward and in sync, roughly twice per second. These projectiles are aimed ahead of the player.
  • An individual Creeper will not fire if it is under the player.
• This attack lasts for 5.1 seconds.

Aftermath

• The Merchant will begin selling Healing Potions and Mana Potions.

Tips

Trivia