Brain of Cthulhu

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Brain of CthulhuPhase 1
Brain of Cthulhu.png
Statistics
TypeBoss
EnvironmentThe Crimson
DamageThis attack will cause defense damage on hit. 30 / 54 Expert Mode / 81 Revengeance Mode / 99 Death Mode / 135 Master Mode
Max Life1400 / 2380 Expert Mode / 2856 Revengeance Mode / 3033 Master Mode / 3639 Revengeance Mode Master Mode
Defense14
KB Resist50% / 55% Expert Mode / 60% Master Mode
Immune toConfusedWebbedTemporal SadnessGlacial StateTime Distortion
Brain of CthulhuPhase 2
Brain of Cthulhu (Phase 2).png
Statistics
TypeBoss
EnvironmentThe Crimson
DamageThis attack will cause defense damage on hit. 30 / 54 Expert Mode / 81 Revengeance Mode / 99 Death Mode / 135 Master Mode
Max Life1400 / 2380 Expert Mode / 2856 Revengeance Mode / 3033 Master Mode / 3639 Revengeance Mode Master Mode
Defense14 (21 while spinning)
KB Resist50% / 55% Expert Mode / 60% Master Mode
Immune toConfusedWebbedTemporal SadnessGlacial StateTime Distortion
If you were looking for the Brain of Cthulhu on the vanilla wiki, click here.

The Brain of Cthulhu is a Pre-Hardmode boss fought in The Crimson biome. It can be fought at anytime.

While in Revengeance and Death Mode, the Brain of Cthulhu has a buffed AI that is much stronger and more complex than the fight in Normal and Expert Modes.

Spawn

The Brain of Cthulhu does not spawn on its own and requires the player to either break 3 Crimson Hearts or use a Bloody Spine in the Crimson.

Behavior

In Revengeance Mode

The Brain of Cthulhu has two phases in Revengeance and Death Mode. This page will not be covering Normal or Expert Modes for the Brain of Cthulhu. If the Brain of Cthulhu is led outside of the Crimson, it will enrage, causing both the Brain and its Creepers to become much faster. It is less aggressive when fought in the Underground Crimson.

The Brain and the Creepers are capable of inflicting multiple debuffs upon contact damage.

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

Phase 1

In the first phase of the fight, the Brain itself is invulnerable but will still have contact damage, there will be 25 Creepers that spawn alongside the brain, which must be killed to progress the fight. During this phase the Brain will teleport around the player at an increasing rate as Creepers are killed. It will also move towards the player after teleporting, getting faster the more Creepers are killed.

Phase 2

Once the Brain's Creepers have all been killed, the Brain transitions into phase 2 and become vulnerable to damage.

During Phase 2, the Brain will continue to teleport around the player and move towards them at an increased speed. There will also be 3 mirror images around the player that will mimic the Brain's movement. They start somewhat transparent but become more opaque as the Brain loses health, making it harder to tell which is the real one.

At 30% health the Brain will switch to another attack, where it will fly around the player in a quick loop before dashing towards them before teleporting.

In Death Mode

  • Can teleport much closer to the player.
  • Creepers move faster.
  • Gains decreased attack delay as its health decreases.

During the Boss Rush

  • Max health increased to 1,000,000 / 1,700,000 Expert Mode / 2,720,000 Revengeance Mode
  • Moves and teleports much faster the less Creepers there are remaining.
  • Movement speed and teleportation greatly increased, and increases further at lower health.
  • Creepers movement speed and acceleration greatly increased.

Summons

Creeper
Creeper.png
Statistics
TypeFlying Enemy
EnvironmentThe Crimson
Damage20 / 36 Expert Mode / 54 Revengeance Mode / 72 Death Mode / 90 Master Mode
Max Life100 / 170 Expert Mode / 220 Revengeance Mode / 216 Master Mode / 237 Revengeance Mode Master Mode
Defense10
KB Resist20% / 28% Expert Mode / 36% Master Mode
Immune toConfused

Resistances

  • Creepers take reduced damage from most non-minion piercing projectiles. Each hit decreases the damage of the next hit by 12%, until the eighth hit onwards which deal 20% of original damage.
  • Creepers take 20% damage from grenade-type projectiles. A list of affected projectiles is below.
Resisted grenades
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Aftermath

Gearing Up

For a Normal and Expert mode guide to Brain of Cthulhu, see Brain of Cthulhu strategies on the vanilla wiki.

Armor

Accessories

Weapons & Equipment

Melee

  • The Cnidarian is a great option due to it being very effective against creepers and the brain itself.
  • The Urchin Mace is a good choice due to its short but piercing whirlpools.
  • A Sharpening Station can give increased armour piercing.

Ranged

  • The Aquashard Shotgun is a great pick to deal with the creepers.
  • The Firestorm Cannon is a good choice, especially with dealing with the creepers.
  • The Tendon Bow with Jester's Arrow is good due to the pierce, even with the brains slight resistance to it.
  • The Minishark can be good at keeping the brain away from you in the second phase.

Mage

  • The Acid Gun is an effective choice to deal with the creepers.
  • The Frost Bolt is an all around great option for both the creepers and the brain.

Summoner

Rogue

  • The Meteor Fist is an all around decent pick for both the brain and the creepers.
  • The Contaminated Bile is a nice option for the creepers.
  • The Mycoroot is also a great pick for the brain itself.

Tips

  • If being fought in the Underground Crimson, it is wise to place platforms in the center of a Crimson chasm as they are usually the largest area in the underground and will allow for more movement.
  • Piercing weapons are useful for the first phase as they will allow you to damage multiple Creepers at once.
  • Lighting up your arena will help aleviate some of the effect from the Darkness debuff.