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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, Mobile version Mobile, and 3DS version3DS pet summon, see Brain.

The Brain of Cthulhu is a Pre-Hardmode Crimson-themed boss. 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 boss itself resembles a large flying brain in its first stage. In this stage, 20 to 30 Creepers spawn along with the Brain 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 in a crimson world.

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. In Expert mode, Creepers can give the player certain debuffs.

Second phase[edit | edit source]

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

Expert mode[edit | edit source]

Also in the second phase, 3 mirror images of the Brain appear to distract the player and become more opaque as the boss loses health. And just like the creepers in expert mode, the Brain can also cause various status effects such as Darkness, Silenced and Weak.

Notes[edit | edit source]

  • Creepers drop Hearts at a higher rate than most enemies.
  • Creepers are more aggressive in Expert mode.
  • Two Brains can be summoned at once by smashing Crimson Hearts. They seem to share their Creepers and go in 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.
  • The Brain of Cthulhu is the only boss 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 possible to use early game melee weapons such as the Katana or Zombie Arm as long as they don't have bad Modifiers, since the Brain takes knockback. 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. This may not work in Expert mode, however, 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.
  • For Expert mode, Bone Javelins can be used to reveal the real brain, as they stick out of it, but also the On Fire! and Poisoned debuffs, because they change it's appearance but the Slime Gun and Water Gun can work as well.
  • Using the Slime Mount in order to bounce on top of the creepers and the brain is a very effective way of avoiding damage, especially in Expert mode. This also reveals the real brain in Expert mode, due to it not causing you to bounce off the fake brains.
  • A decent way to distinguish the real brain from the fake brain is to move slowly towards one of the illusions. If the illusions spread out, then the brain is at the other side. However, if the illusions close in, then the player is getting nearer to the brain making it easier to tell.
  • Selling all the Crimtane Ore that can be obtained from it and the Creepers is a great way to make money in Pre-Hardmode.


Trivia[edit | edit source]

See also[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 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.