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Brain of Cthulhu

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Brain of CthulhuFirst Form
Brain of Cthulhu.png
AI TypeBrain of Cthulhu AI
Damage30 / 54
Max Life1000 / 1700 / 2167
3000-4000 / 5100-6800 / 6487-8647 (with creepers)
KB Resist50% / 55%
Immune toConfused
Coins50000*5 Gold Coin.png
Map Icon Brain of Cthulhu.png
Map Icon
Brain of CthulhuSecond Form
Brain of Cthulhu-2nd.png
AI TypeBrain of Cthulhu AI
Damage30 / 54
Max Life1000 / 1700 / 2167
KB Resist50% / 55%
Immune toConfused
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 version3DS pet summon, see Brain.
A piece of Cthulhu torn asunder, this vile mastermind pulses with agony and aids the Crimson to an attempt to avenge its master.

— The Bestiary

The Brain of Cthulhu is a pre-Hardmode Crimson-themed boss resembling a large, flying brain. It can be summoned 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. In the first, the Brain is invulnerable and teleports randomly around the player. 20 Creepers spawn along with the Brain and orbit the boss at high speed. 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 becomes vulnerable to attack and can be killed.

Defeating the Brain of Cthulhu and its attendant Creepers is the only way to obtain Tissue Samples, and is one of the ways to obtain usable quantities of Crimtane Ore. Defeating the Brain of Cthulhu for the first time allows the Tavernkeep NPC to spawn.

The Brain of Cthulhu is the Crimson counterpart to the Eater of Worlds. Unlike its Corruption counterpart, it does not have a mechanical equivalent in Hardmode.

While the Brain of Cthulhu is alive, the 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 CreeperCreeper minions attack the player. 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 it aggressively attempts to ram the player before teleporting away.

Expert mode[edit | edit source]

In Expert mode, the second phase now has three mirror images of the Brain appear around the player, mirroring the Brain's movements and becoming more opaque as the boss loses health. Furthermore, both the Creepers (in the first phase) and the Brain (in the second phase) inflict a random debuff upon contact. The probabilities of applying each debuff are listed in the following table; note that the Creepers always inflict a debuff while the Brain only has a 1/3 (33.33%) chance to do so.[1]

Debuff Duration Chance (Brain) Chance (Creepers)
PoisonedPoisoned 2.625 – 5.25 seconds 11/243 (4.53%) 11/81 (13.58%)
DarknessDarkness 1.5 – 3 seconds 11/243 (4.53%) 11/81 (13.58%)
CursedCursed 0.375 – 0.75 seconds 2/243 (0.82%) 2/81 (2.47%)
BleedingBleeding 3.75 – 7.5 seconds 11/243 (4.53%) 11/81 (13.58%)
ConfusedConfused 0.75 – 1.5 seconds 2/243 (0.82%) 2/81 (2.47%)
SlowSlow 2.625 – 5.25 seconds 11/243 (4.53%) 11/81 (13.58%)
WeakWeak 5.625 – 11.25 seconds 11/243 (4.53%) 11/81 (13.58%)
SilencedSilenced 0.75 – 1.5 seconds 11/243 (4.53%) 11/81 (13.58%)
Broken ArmorBroken Armor 4.875 – 9.75 seconds 11/243 (4.53%) 11/81 (13.58%)

Master modeDesktop Version[edit | edit source]

In Master mode, the Brain of Cthulhu gains a significant health increase of roughly 27.5%. This brings its HP to 2167, an increase of 467 health points from its Expert mode equivalent. When factoring in the Creepers, the boss's overall health ranges from 6487 HP to 8647 HP. Other Expert mode elements apply.

Notes[edit | edit source]

  • Creepers drop Hearts at a higher rate than most enemies.
  • Creepers are more aggressive in Expert mode and even more so in Master modeDesktop Version.
  • Two Brains can be summoned at once by smashing Crimson Hearts. They seem to share their Creepers and go into their second phases 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 to progress, 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 VersionConsole Version and, as of Desktop Version, Meteorites.
  • Console VersionOld-gen console versionMobile Version3DS Version Crafting the Deathbringer Pickaxe (from Tissue Samples and Crimtane Ore) will not be necessary if the player obtains the Reaver Shark (through fishing).

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, Console, and Mobile Versions

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. Weapons that inflict these debuffs 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 the 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 the Trident or The Rotted Fork is recommended.
    • Note that this may not work in Expert mode, since 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, since Creepers often group up in a clustered formation, effectively allowing the player to hit most if not all of the Creepers in one well-aimed shot.

The Quad-Barrel Shotgun is an excellent weapon to use for the brain's second form. It deals extremely high close-range damage and can end the fight before the Brain’s illusions get too opaque.

  • 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. The illusions will quickly spread away from the real Brain if the player is walking away from it, but the real Brain will continue to move at a steady pace.
    • The minimap displays only the real Brain.
    • When using a controller, the lock on feature will only target 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]

  • The Brain of Cthulhu, among several other bosses, is based on Cthulhu, a creature first imagined by H. P. Lovecraft in his short story The Call of Cthulhu.
  • 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.
    • Official Terraria Lore – According to the official game lore, the Mechanic never finished Cthulhu's mechanical brain, thus explaining its lack of a mechanical counterpart
  • The Brain of Cthulhu has the least health out of all the bosses, with even less than the Eye of Cthulhu in its second form. However, when adding in the health of the Creepers, it has more health than King Slime.
  • The Brain is the only boss that is affected by knockback.
  • Contrary to popular belief, Creepers do not drop Souls of Night, Desktop, Console, and Mobile Versions Biome Keys, or Old-gen console version3DS Version Biome Key Molds.
  • It is one of the only two bosses whose map icon does not change after entering its second phase, the other being Santa-NK1.
  • The Brain of Cthulhu is sometimes abbreviated as "BoC."
  • The list of debuffs inflicted by the Brain and Creepers in Expert Mode just so happens to be exactly the same as the list of debuff immunities granted by the Ankh Charm. The Ankh Shield also gives these immunities, with the addition of Burning and Chilled. Of course, it is fairly trivial to defeat the Brain of Cthulhu at the point in the game that the Ankh Charm can be obtained.

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.

References[edit | edit source]

  1. Information taken from the Desktop version Desktop source code, function StatusFromNPC() in Terraria.Player.cs There may be inaccuracies, as the current Desktop version Desktop version is