Guide:Brain of Cthulhu strategies

From Terraria Wiki
Jump to navigation Jump to search
This is a Guide page.
This is a Guide page.
This means the page will walk you through a specific task, strategy, or enemy/boss fight.
Status: Under revision (This Guide is currently being revised or has been revised partially. It hasn't met all quality standards yet.)
  • Issues:
     • Testing on weapons and accessories may be needed, page is up to date otehrwise. Remember not to delete pre-1.4 content; use {{eicons}} and {{eversions}}!
  • This guide is about Brain of Cthulhu, which is exclusive to Crimson worlds. Players playing in Corruption worlds should check Guide:Eater of Worlds strategies instead.
    Brain of Cthulhu Trophy.png"An enormous demon brain which haunts the creeping crimson."Brain of Cthulhu Trophy.png

    The Brain of Cthulhu is a Pre-Hardmode boss. It is The Crimson counterpart of Eater of Worlds.

    Brain of CthulhuFirst Form
    Brain of Cthulhu (First Phase).gif
    Map Icon Brain of Cthulhu.png
    Map Icon
    Classic mode icon.png Classic
    Expert mode icon.png Expert
    Master mode icon.png Master
    AI TypeBrain of Cthulhu AI
    Max Life1250/2125/2709
    325055257029 (with Creepers)[1][2]
    KB Resist55% (Desktop, Console and Mobile versions) / 50% (Old-gen console and 3DS versions)60%64%
    Immune toConfused
    Coins5 GC12 GC50 SC
    Brain of CthulhuSecond Form
    Brain of Cthulhu (Second Phase).gif
    Map Icon Brain of Cthulhu.png
    Map Icon
    Classic mode icon.png Classic
    Expert mode icon.png Expert
    Master mode icon.png Master
    AI TypeBrain of Cthulhu AI
    Max Life1250/2125/2709
    KB Resist55% (Desktop, Console and Mobile versions) / 50% (Old-gen console and 3DS versions)60%65%
    Immune toConfused
    Coins5 GC12 GC50 SC

    Spawn Conditions

    The Brain of Cthulhu can be spawned by fulfilling one of these conditions:

    It must then be defeated within the Crimson: getting out of it will make it retreat and despawn.

    The Fight

    Brain of Cthulhu has 2 phases, with the latter starting after all CreeperCreepers have been dealt with.

    First Phase

    The Brain cannot be attacked in this phase, only the Creepers can. The Brain will teleport to a spot in the arena, then slowly advance towards you. The Creepers will follow shortly after and will clump up with the brain for a few seconds before the Brain teleports again and the Creepers will follow. The idea is that the Brain will teleport behind you, which will make the Creepers fly into you, causing damage. Jump out of the way, either by using your platforms or with an extra jump, then attack the Creepers. Use piercing weapons to speed up the process. When a Creeper dies it can drop either Crimtane OreCrimtane Ore or Tissue SampleTissue Sample.

    Second Phase

    When all of the Creepers are dead, the Brain will split, revealing a Heart with an Eye on the inside. The Brain teleports much more frequently, often at unexpected angles, and will try to ram into you. The Brain only has 1250/ 2125 / 2709 health, so it can be killed fairly quickly. Keep using your platforms to jump out of the way. Use your strongest weapon to take down the Brain. If you have a weapon with high knockback, it will excel at dealing with the Brain, so much so that it's possible to stand in one location and attack it whenever it gets close.

    Expert Mode

    The Creepers are much more aggressive. They will actively try to fly into you, even ignoring the Brain if it means an opportunity to land an extra hit or two. They can also inflict a large variety of debuffs:

    • ConfusedConfused: reverses the movement buttons;
    • PoisonedPoisoned: saps 2 health per second;
    • BleedingBleeding: stops health regeneration;
    • DarknessDarkness: reduces vision;
    • SilencedSilenced: makes you unable to cast any Magic weapons;
    • Broken ArmorBroken Armor: reduces your Defense by half;
    • WeakWeak: reduces Melee damage and Attack Speed, Movement Speed, and Defense by 4.
    • CursedCursed: makes you unable to use any items;
    • SlowSlow: reduces movement speed.

    During the Second Phase, the Brain will spawn clones of itself around the player. They serve as decoys, and while they cannot be attacked they can confuse the player. They start off as barely visible but as the Brain loses more health the clones will become more opaque. At low health the clones will be completely visible. The Brain will also become faster as it loses health. Life-draining debuffs such as On Fire! and Frostburn will help distinguish them. Additionally, summoned Minions will always target the correct copy.

    General Strategies

    General Tips

    This content is transcluded from Guide:Practical tips § Combat.

    • Boss battles can be won or lost before the battle ever starts. Choose your equipment and have it ready; find and/or make potions and placed buffs; use the highest-tier food you have available; set up an arena appropriate to the boss; learn the strategies for the boss you're facing.
    • Prepare your Boss-fighting arena with adequate lighting, CampfireCampfires and Heart LanternHeart Lanterns for health regeneration, and Star in a BottleStars in Bottles for mana regeneration if you use magic. Bast StatueBast Statues(Desktop, Console and Mobile versions) will provide a significant defensive boost. Garden GnomeGarden Gnomes(Desktop, Console and Mobile versions) and (Desktop, Console and Mobile versions) (if underground) proper torch placement will reduce damage taken and increase damage dealt due to the luck. The Torch God's Favor(Desktop, Console and Mobile versions) helps with this. HoneyHoney pools can also be used for extra health regeneration.
    • (Desktop, Console and Mobile versions) SunflowerSunflowers provide the Happy!Happy!(Desktop, Console and Mobile versions) buff to nearby players, which grants a +10% movement speed bonus and 17% reduction in enemy spawn rate.
    • Always carry around a stack of the highest-tier healing potion available, as relying only on natural Health Regeneration is not a good idea. Depending on the game stage, this can include items such as Lesser Healing PotionLesser Healing Potions or HoneyfinHoneyfins. On the Desktop version Desktop, Console version Console, and Mobile version Mobile versions, Restoration PotionRestoration Potions are healing potions with a shorter cooldown.
    • Bosses are displayed on the Minimap: Follow the boss's icon to track it when you're struggling to find it. You can identify the boss icons by checking their respective wiki pages.
    • Once you have freed the MechanicMechanic in the Dungeon, you can use WireWire to enhance your arena with Dart TrapTraps and helpful Heart StatueHeart and Star StatueStar Statues. The former helps to damage the enemies, though be careful to set them up correctly in order not to hurt yourself during the battle. The latter will spawn heart and star pickups, respectively. Connect these devices to 1 Second Timertimers to activate them infinitely.
    • In Hardmode, the Brand of the InfernoBrand of the Inferno(Desktop, Console and Mobile versions) and Sergeant United ShieldSergeant United Shield(Desktop, Console and Mobile versions) can be used to parry incoming contact damage.
    • It may be useful to summon and kill the Eye of Cthulhu or King Slime before summoning any harder boss in order to spawn an extra one-use pool of Hearts. Note that this will prevent any Heart Statues from spawning new Hearts.
    • Remember to use the Sharpening StationSharpening Station(Desktop, Console and Mobile versions), Ammo BoxAmmo Box(Desktop, Console, Old-gen console and Mobile versions), Crystal BallCrystal Ball, Bewitching TableBewitching Table(Desktop, Console and Mobile versions), War TableWar Table(Desktop, Console and Mobile versions), and Slice of CakeSlice of Cake(Desktop, Console and Mobile versions) before you go to explore or battle bosses/invasions. These will give boosts that are useful to have, with the first five being class-specific. They give SharpenedSharpened(Desktop, Console and Mobile versions), Ammo Box (buff)Ammo Box(Desktop, Console, Old-gen console and Mobile versions), ClairvoyanceClairvoyance, BewitchedBewitched(Desktop, Console and Mobile versions), StrategistStrategist(Desktop, Console and Mobile versions), and Sugar RushSugar Rush(Desktop, Console and Mobile versions), respectively.

    Terrain Preparation

    Standard 5 layer arena.

    Your arena will have to be built in The Crimson, because it can only be summoned there. Since the Brain of Cthulhu spawns as soon as you smash a third Crimson Heart, you're likely to be in a very enclosed area when the fight begins. This can lead to you being swarmed by the Creepers and getting overwhelmed. This can be avoided by preparing the chasm's main chamber as an arena beforehand, and choosing which Hearts to break first:

    • For the first two, pick the least convenient hearts (distant, above the main chamber, underwater, etc).
    • For the third, pick the closest to the main chamber, toss a Bomb or another explosive, and quickly go to your arena while it falls.

    If you have access to the Dryad, purchase several stacks of Purification Powder and completely convert the main chamber so that there is no Crimstone Block exposed to air, which prevents you from needing to deal with other Crimson-based enemies during the fight, although standard Underground enemies may spawn in their place. Set up several rows of platforms all the way across the central chamber, close enough that you can jump up to the next platform, and light up everything.

    If summoned with a Bloody Spine, then the arena can simply be made in the Surface, however, do not make it very tall, as jumping too far above it will be considered exiting the Crimson, causing the Brain of Cthulhu to despawn. If you have already prepared the central chamber as an arena for a prior fight, use the Bloody Spine there to avoid a despawn.

    (Old-gen console and 3DS versions)The Brain Of Cthulhu is unique in the way it reacts when you die. Unlike every other boss, The Brain Of Cthulhu does not despawn upon your death, rather it keeps ramming into the spot you died. You can use this to your advantage by using Purification Powder to clear out a small area to make a basic house. Then if you place a bed inside, you have a respawn point in the main chamber. Now, there is virtually no consequence to dying in the fight, as you can keep respawning and continue the battle.

    Gearing up

    It is recommended to have at least 200 Life and (if using magic/summoning weapons) 100 Mana, which requires 5 Life CrystalLife and Mana CrystalMana Crystals: if you've done some spelunking you're bound to have come across enough Life Crystals, and Mana Crystals can be easily crafted with 5 Fallen StarFallen Stars scattered around the surface at night.

    • Gold HelmetGold or Platinum HelmetPlatinum armor are great options for melee users due to their high defense. Silver HelmetSilver or Tungsten HelmetTungsten armor are slightly riskier, but also viable options, especially if you are confident in your dodging abilities.
    • Gladiator armorGladiator armor(Desktop, Console and Mobile versions) is another viable option for melee users due to it having the same defense as gold armor and providing knockback immunity. It can take much longer to acquire than Gold or Platinum armor, but can still prove useful.
    • Fossil HelmetFossil armor(Desktop, Console and Mobile versions) is the only ranger set available at this point and pairs well with the MinisharkMinishark.


    For Melee users:

    • The star projectiles created by the StarfuryStarfury can pierce through and deal massive damage to the creepers.
    • The Blade of GrassBlade of Grass is an incredibly effective weapon against both phases of the fight. The Blood ButchererBlood Butcherer is a weaker alternative against the first phase
      • The Falcon BladeFalcon Blade or Exotic ScimitarExotic Scimitar(Desktop, Console and Mobile versions) are useful for the Brain of Cthulhu's second phase, as their rapid speed, somewhat high damage, and decent knockback will keep it at bay.
      • The KatanaKatana(Desktop, Console, Old-gen console and Mobile versions), which is sold from the Traveling MerchantTraveling Merchant(Desktop, Console, Old-gen console and Mobile versions), is a fast sword with decent knockback and a high critical rate.
    • A spear is a good weapon against the Brain of Cthulhu during the second stage. Suggested options are the TridentTrident and The Rotted ForkThe Rotted Fork. The SwordfishSwordfish is better and can be used if the player has done some fishing in the ocean.
    • A flail of some kind is beneficial for taking out the Creepers; the easiest to obtain would be the Flaming MaceFlaming Mace(Desktop, Console and Mobile versions) (craftable from a MaceMace(Desktop, Console and Mobile versions), which can be found in Gold ChestGold Chests located underground). Even more effective would be The MeatballThe Meatball, which would require killing a few Creepers (but not necessarily the Brain itself). The Chain KnifeChain Knife is much more difficult to obtain and is much less useful during the first phase.
    • A yoyo is useful against the Brain in its second stage; the AmazonAmazon(Desktop, Console and Mobile versions) is a great choice at this point, although the Code 1Code 1(Desktop, Console and Mobile versions) (available from the Traveling Merchant) is also a good option if you can get one, having higher damage but quite low knockback.

    For Ranged users:

    • Tendon BowTendon Bow is the most powerful bow at this stage. The Gold BowGold Bow and Platinum BowPlatinum Bow are viable alternatives. You can combine them with either Unholy ArrowUnholy Arrow or Jester's ArrowJester's Arrows, which greatly help to kill the swarm of Creepers. However, you can also use Frostburn ArrowFrostburn Arrows as a slightly cheaper alternative; the FrostburnFrostburn debuff will be helpful during the second stage.
    • Blood Rain BowBlood Rain Bow(Desktop, Console and Mobile versions) does 5 less damage than the Tendon Bow but fires several streams at once. Its inaccuracy is offset by the many creepers to hit in the first stage and the large size of the Brain in the second stage. If you use this underground, make sure you're in a large enough space that the blood can fall freely from the top of the screen.
    • Molotov CocktailMolotov Cocktails(Desktop, Console, Old-gen console and Mobile versions) are a superb weapon. The splash damage and the fire that hits multiple times can keep the Brain away in its second stage.
    • If you are willing to risk, GrenadeGrenades are great choices for dealing with the Creepers, but you have to watch out for the blast radius, as you will take damage from it.
    • Non-explosive consumables, such as ShurikenShuriken and Throwing KnifeThrowing Knives, can be effective since they penetrate multiple enemies, meaning that they can hit multiple Creepers.
    • Spiky BallSpiky Balls with their Penetration are very helpful for killing Creepers. Since they take a while to disappear, it's a good idea to throw many of them into your arena before starting the fight.
    • Bone JavelinBone Javelins(Desktop, Console and Mobile versions) are very effective against the second phase due to their high single target damage. The regular JavelinJavelins(Desktop, Console and Mobile versions) are also effective.
    • As The UndertakerThe Undertaker can be obtained very easily (as it's a guaranteed first-time loot from the Hearts), it's a good weapon to use against the Brain. The Musket BallMusket Balls that spawn with it should be sufficient, but you can craft (or buy) Silver BulletSilver Bullets / Tungsten BulletTungsten Bullets(Desktop, Console and Mobile versions), which deal slightly more damage.
    • Alternatively, once you obtain The Undertaker, you can gain access to the Arms DealerArms Dealer, who can provide you with a MinisharkMinishark, which is effective against the Creepers and the brain in the second phase if used with Silver or Tungsten bullets due to its rate of fire.
    • Another gun that you might have acquired at this point is the BoomstickBoomstick. At a closer range it may be useful in taking out the creepers, as they have low individual health and there are many of them, and also proves effective against the brain itself.

    For Magic users:

    • The Crimson RodCrimson Rod is a great support weapon that can easily be obtained through Crimson Hearts.
    • A Diamond StaffDiamond Staff is very good at taking out the creepers because of its high fire rate and pierce.
      • The Amber StaffAmber Staff(Desktop, Console and Mobile versions), Ruby StaffRuby Staff and Emerald StaffEmerald Staff are weaker, but still viable alternatives.
      • A Thunder ZapperThunder Zapper(Desktop, Console and Mobile versions) has similar damage and speed, but as a result of its lack of piercing it isn't as effective as a gem staff against the creepers.
    • If obtained, the Gray ZapinatorGray Zapinator(Desktop, Console and Mobile versions) is one of the best magic weapons pre-hardmode and is incredibly effective against both the Brain and creepers.
    • If you're willing to make a quick detour to a Corruption world, the VilethornVilethorn works fantastically against the Creepers and is a great weapon in general.
    • (Old-gen console and 3DS versions) If you already farmed a Meteorite crash site for Meteorite, you can use the excellent Space GunSpace Gun with Meteor HelmetMeteor armor: its piercing ability will clear out the Creepers fairly easily, and it will cost no mana thanks to the set bonus of Meteor armor.
    • The Demon ScytheDemon Scythe is an excellent choice for dealing high damage to both phases if you're willing to get it.

    For Summoners:

    • All these tips only apply to Desktop version Desktop version, Console version Console version, and Mobile version Mobile version.
    • The SnapthornSnapthorn(Desktop, Console and Mobile versions) is the best whip available and can remain useful through pre-hardmode due to its attack speed increase and PoisonedPoisoned debuff.
      • If the SnapthornSnapthorn(Desktop, Console and Mobile versions) is too difficult to obtain, one can resort to the Leather WhipLeather Whip(Desktop, Console and Mobile versions), which isn't as effective but still helps re-targeting minions.
    • For a minion the best options are Flinx StaffFlinx Staff(Desktop, Console and Mobile versions) and Vampire Frog StaffVampire Frog Staff(Desktop, Console and Mobile versions).
      • The Finch StaffFinch Staff(Desktop, Console and Mobile versions) can also be used if the player has not obtained the summons listed above, but is a much weaker alternative.



    • The Cloud in a BottleCloud in a Bottle will give you a double-jump ability which will greatly help with evasion. Look out for the alternative versions, some of which are more performant: the Fart in a JarFart in a Jar, the Tsunami in a BottleTsunami in a Bottle(Desktop, Console and Mobile versions), the Blizzard in a BottleBlizzard in a Bottle, or the Sandstorm in a BottleSandstorm in a Bottle. Rocket BootsRocket Boots and its upgrades can replace these if acquired.
      • Additionally, if you want more flight time you can search the Skyware ChestSkyware Chests on Floating Islands to try and find Fledgling WingsFledgling Wings(Desktop, Console and Mobile versions)
    • The Hermes BootsHermes Boots will increase your speed and aid greatly in evasion. You can upgrade them to the Spectre BootsSpectre Boots for the added bonus of a few seconds of flight, but this requires the Goblin TinkererGoblin Tinkerer, which you may not have yet. Even better is the Lightning BootsLightning Boots, however, they can take a while to obtain.
    • The Shark Tooth NecklaceShark Tooth Necklace(Desktop, Console and Mobile versions) is one of the best offensive options for pre-hardmode and pairs especially well with faster weapons.
    • The Band of RegenerationBand of Regeneration is a decent accessory that will slowly regenerate your life; it equates to one heart restored every 40 seconds. Not terribly useful but it's suggested if you have a slot you need to fill.
    • The MagiluminescenceMagiluminescence(Desktop, Console and Mobile versions) is good for increased movement speed and changes in momentum.
    • The Frog LegFrog Leg will give you improved jumping abilities, including increased height and automatic jumping but it can only be found by fishing, though it is rather rare.
    • The Panic NecklacePanic Necklace can be effective for avoiding repeated hits
    • If one is playing in Expert Mode, the Shield of CthulhuShield of Cthulhu(Desktop, Console and Mobile versions) is a great choice for quick evasion, and extra damage in the Brain's second phase. Specifically, if you dash whenever it disappears and reappears, you will either safely avoid the brain or run directly into it; either way, you won't take damage.
    • The Mana FlowerMana Flower (crafted from a Nature's GiftNature's Gift and a Mana PotionMana Potion) and its upgrades allow mages to continuously use their weapon without the need to stop and manually use mana potions.
    • The Feral ClawsFeral Claws are excellent for summoners using whips.

    Accessories with Menacing or Warding modifiers will be most efficient here if you have them, but are not required.

    1. Information taken from the Desktop version Desktop source code, AI() in Terraria.NPC.cs. The relevant part the is the aiStyle == 54 block. There may be inaccuracies, as the current Desktop version Desktop version is
    2. Information taken from the Desktop version Desktop source code, GetBrainOfCthuluCreepersCount() in Terraria.NPC.cs. There may be inaccuracies, as the current Desktop version Desktop version is