Brain of Cthulhu

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Brain of Cthulhu First Form
Brain of Cthulhu.png
Statistics
Type Boss
Environment The Crimson
AI Type Brain of Cthulhu AI
Damage 30
Max Life 1000 / 1700 Desktop only.png
3000-4000 w/creepers
5700-7700 w/creepers Desktop only.png
Immune to: Confused.png

Map Icon Brain of Cthulhu.png
Map Icon
Internal NPC ID: 266
Brain of Cthulhu Second Form
Brain of Cthulhu-2nd.png
Statistics
Type Boss
Environment The Crimson
AI Type Brain of Cthulhu AI
Damage 30
Max Life 1000 / 1700 Desktop only.png
Defense 14
Immune to: Confused.png
Item (Quantity) Rate
Brain of Cthulhu Mask.png Brain of Cthulhu Mask 
14.29%
Brain of Cthulhu Trophy.png Brain of Cthulhu Trophy 
10%
Crimtane Ore.png Crimtane Ore 
• 40-90
100%
Lesser Healing Potion.png Lesser Healing Potion 
• 5-15
100%
Tissue Sample.png Tissue Sample 
• 30-50
100%
Bone Rattle.png Bone Rattle Desktop only.png
Desktop only.png
5%
Treasure Bag (Brain of Cthulhu).png Treasure Bag
(Brain of Cthulhu)
 Desktop only.png
• in Expert Mode only Desktop only.png
100% Desktop only.png

Map Icon Brain of Cthulhu.png
Map Icon
Internal NPC ID: 266

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

For the Console only.png Console/Mobile only.pngMobile pet, 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 attack.

The Brain of Cthulhu is the Crimson counterpart to the Corruption's Eater of Worlds. Much like its cousin, fighting it is essential for progression, as the Brain and its attendant Creepers are the only source of Tissue Samples and usable quantities of Crimtane Ore, which are required to craft advanced tools and armor. Note that, like with the Eater of Worlds, actually defeating the Brain of Cthulhu is not completely necessary, as long as you are able to destroy enough Creepers to get the materials you need.

Aside from it's counterpart, Eater of Worlds, it does not have a mechanical counterpart.

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

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.png Creeper 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 inflict various status effects.

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 visible 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.

Achievement[edit | edit source]

Achievement Mastermind.png Mastermind"Defeat the Brain of Cthulhu, an enourmous demon brain which haunts the creeping crimson."
Defeat the Brain of Cthulhu for the first time. Desktop only.png

Notes[edit | edit source]

  • Creepers drop Hearts at a higher rate than most enemies.
  • Creepers are more aggressive on Expert Mode.
  • You can summon two Brains 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 (unless one manages to lure it into The Corruption). This also happens when breaking Crimson Hearts outside of the Crimson biome (this is possible if surrounding Crimson is converted by Purification Powder or the Clentaminator) - the message text for the boss is displayed, and the boss spawns, but it will quickly sink through the map and despawn, usually before entering the player's screen.

Tips[edit | edit source]

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

  • As Creepers drop Tissue Samples and Crimtane Ore fairly frequently, it's technically not necessary to defeat the Brain of Cthulhu to gain access to Crimson-tier equipment, only to kill a couple of Creepers and secure their drops.
  • 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. If you use a high fire rate weapon, like The Minishark, it seems to move at a very slow rate.
  • 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.
  • Since the Brain of Cthulhu spawns as soon as you smash a third Crimson Heart, you are likely to be in tight quarters when the attack begins. This can lead to you being swarmed by the Creepers and overwhelmed. You will likely have a much easier time defeating the boss by summoning it manually in the large main room of the Crimson or outside.
  • Using ~25-40 Grenades can be a very easy way of defeating the boss. Grenades can be very effective against the Creepers.
  • Building a closed box (about 15x15) and using Water Bolt constantly is a great way to fight Brain of Cthulhu, bolts will kill any Creeper that gets into a box, triggering Brain of Cthulhu's second form within seconds and will also keep it away by knocking it back it every time it teleports. Make sure you have enough Mana or a Mana Flower, because you will have to spam Water Bolt all the time. Similar tactic can be used against Eater of Worlds.
  • For Expert Mode, Bone Javelins can be used to reveal the real brain, as they stick out of it.

Trivia[edit | edit source]

  • The Brain of Cthulhu and the Eye of Cthulhu, are based on the character Cthulhu from the works of the author H.P. Lovecraft.
  • Unlike the correlation between the Eater of Worlds and The Destroyer, the Brain of Cthulhu does not have a Hardmode counterpart, although The Destroyer's Probes are similar in function to its Creepers.
  • The Brain of Cthulhu has the least HP out of all the bosses, with even less than the Eye of Cthulhu in its second form. However, if counting the health of the creepers, it has more health than King Slime.

History[edit | edit source]

  • 1.3.0.1:
  • 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.
  • 1.2: Introduced.
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