Brain of Cthulhu

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Brain of CthulhuFirst Form
Brain of Cthulhu.png
Statistics
TypeBoss
EnvironmentThe Crimson
AI TypeBrain of Cthulhu AI
Damage30 / 54
Max Life1000 / 1700
3000-4000 / 5700-7700 (with creepers)
Defense14
KB Resist100%
Inflicts debuffSlowSlow
12.5% chance

Debuff duration8.75 - 17.5 seconds
Debuff tooltipMovement speed is reduced
Immune toConfused
Drops
Coins 5 Gold Coin
Map Icon Brain of Cthulhu.png
Map Icon
Brain of CthulhuSecond Form
Brain of Cthulhu-2nd.png
Statistics
TypeBoss
EnvironmentThe Crimson
AI TypeBrain of Cthulhu AI
Damage30 / 54
Max Life1000 / 1700
Defense14
KB Resist100%
Inflicts debuffSlowSlow
12.5% chance

Debuff duration8.75 - 17.5 seconds
Debuff tooltipMovement speed is reduced
Immune toConfused
Drops
Coins 5 Gold Coin
Map Icon Brain of Cthulhu.png
Map Icon

Brain of Cthulhu Trophy.png "A horrible chill goes down your spine..." Brain of Cthulhu Trophy.png

For the Old-gen console version Old-gen console and 3DS versionDS pet summon, see Brain.

The Brain of Cthulhu is a Pre-Hardmode Crimson-themed boss resembling a large flying brain. It spawns when players destroy 3 Crimson Hearts in a Crimson world, or when a player uses a Bloody Spine anywhere in a Crimson biome.

The Brain of Cthulhu has two stages. 20 to 30 Creepers spawn along with the initially invulnerable Brain in its first stage and orbit the boss at high speed, following it wherever the boss teleports to. Creepers do not respawn once they are killed. All Creepers must be destroyed first before the Brain of Cthulhu enters its second phase, where it then becomes vulnerable to attacks.

Defeating the Brain of Cthulhu and its attendant Creepers is the only way to obtain Tissue Samples and usable quantities of Crimtane Ore.

The Brain of Cthulhu is the Crimson counterpart to the Corruption's Eater of Worlds. Unlike its corruption counterpart, it does not have a mechanical counterpart.

On the Desktop version Desktop version, defeating the Brain of Cthulhu for the first time allows the Tavernkeep NPC to spawn.

While the Brain of Cthulhu is alive, music Boss 3 will play.

Attacks[edit | edit source]

First phase[edit | edit source]

The Brain itself is initially invincible. It teleports around the player, drawing nearer before teleporting away again in a random direction while its Creeper minionsCreeper minions attack. The Creepers do not teleport along with the Brain but are instead pulled between the player and the Brain in large, sweeping orbits. Once all Creepers are defeated, the Brain enters its second phase.

Second phase[edit | edit source]

In the second phase, the Brain becomes vulnerable to attacks and knockback and aggressively attempts to ram the player before teleporting away.

Expert mode[edit | edit source]

In the second phase, three mirror images of the Brain appear and become more opaque as the boss loses health. Furthermore, both the Creepers (in the first phase) and the Brain (in the second phase) inflict one of the following debuffs. While every Creeper always inflicts a debuff upon hit, the Brain only has a 33.3% (1/3) chance to do so. All debuffs have a 11.1% (1/9) chance to be inflicted, except for Cursed and Confused, which only have a 1.23% (1/81) chance to be inflicted.

Debuff Duration
Poisoned Poisoned 2.625 – 5.25 seconds
Darkness Darkness 1.5 – 3 seconds
Cursed Cursed 0.375 – 0.75 seconds
Bleeding Bleeding 3.75 – 7.5 seconds
Confused Confused 0.75 – 1.5 seconds
Slow Slow 2.625 – 5.25 seconds
Weak Weak 5.625 – 11.25 seconds
Silenced Silenced 0.75 – 1.5 seconds
Broken Armor Broken Armor 4.875 – 9.75 seconds

Notes[edit | edit source]

  • Creepers drop Hearts at a higher rate than most enemies.
  • Creepers are more aggressive in Expert modeDesktop VersionConsole VersionMobile Version.
  • Two Brains can be summoned at once by smashing Crimson Hearts. They seem to share their Creepers and go in to their second phase simultaneously.
  • If the player leaves the Crimson, the Brain of Cthulhu will disappear.
  • Note that actually defeating the Brain of Cthulhu is not completely necessary, as the Creepers may drop the needed amount of materials.
    • However, defeating the Brain of Cthulhu is the only way to gain access to the TavernkeepDesktop Version.
  • Crafting the Deathbringer Pickaxe (from Tissue Samples and Crimtane Ore) will not be necessary if the player obtains the Reaver Shark (through fishing).

Tips[edit | edit source]

For more elaborate strategies on defeating Brain of Cthulhu, including weapon and arena recommendations, see Guide:Brain of Cthulhu strategies.

  • Creepers have low individual health and are especially susceptible to the On Fire! and Frostburn debuffs, so weapons that inflict those can make quick work of them.
  • Since the Brain of Cthulhu is susceptible to knockback, weapons with high knockback such as the The Rotted Fork can keep both Creepers and the Brain from closing distance between teleports. It is also possible to use early-game melee weapons such as the Katana or Zombie Arm as long as they do not have disadvantageous modifiers. It is preferable to use spears for this fight since they deal more knockback, however, so a Trident or The Rotted Fork can be used. Note that this may not work in Expert modeDesktop VersionConsole VersionMobile Version, because it might be hard to tell which Brain to attack among the illusions.
  • Jester's Arrows or other enemy-piercing weapons can be immensely helpful while fighting the first stage of the Brain of Cthulhu because Creepers often line up in a relatively straight formation, effectively allowing the player to hit most if not all of the Creepers in one well-aimed shot.
  • Desktop VersionConsole VersionMobile Version There are several methods to reveal the real Brain of Cthulhu in the second stage:
    • Bone Javelins only stick out of the real Brain.
    • The On Fire! and Poisoned debuffs damage only the real Brain.
    • The Slime Gun and Water Gun cause visual effects only to the real Brain. Note that these do not deal damage.
    • The Slime Mount only bounces off the real Brain.
    • The illusions position themselves in relation to the player. If the illusions spread out while walking towards one of them, then the real Brain is at the other side. However, if the illusions close in, then the player is getting nearer to the real Brain.
  • Selling all the Crimtane Ore that can be obtained from the fight is a very effective way to make money in Pre-Hardmode.

Trivia[edit | edit source]

Achievement[edit | edit source]

Achievement Mastermind.png
Mastermind • "Defeat the Brain of Cthulhu, an enormous demon brain which haunts the creeping crimson."
Defeat the Brain of Cthulhu for the first time. Desktop VersionConsole VersionMobile Version

History[edit | edit source]

  • Desktop 1.2.3:
    • Killing the Brain of Cthulhu will now allow the Dryad to move into your town.
    • Now has a chance to drop the Brain Mask.
    • Fixed bug where beating Brain of Cthulhu wouldn't make dryad stop talking about the chasms.