The Brain of Cthulhu is a pre-Hardmode, Crimson-themed boss resembling a large, flying brain. It is the Crimson counterpart to the Eater of Worlds.
This guide provides a comprehensive strategy for defeating the Mechanical Brain of Cthulhu in Terraria, covering everything from arena setup and gear recommendations to detailed battle tactics.
How to Defeat Brain of Cthulhu Master Mode Terraria (EASY!)
Spawning the Brain of Cthulhu
Assuming this is the first boss that players are attempting to tackle, and their Terraria map has generated a Crimson biome, Brain of Cthulhu (BoC) serves as a good wake-up call to test players. After avoiding attacks from pesky Crimson monsters, players have to destroy three Crimson Hearts in order to spawn the BoC.
- The Brain of Cthulhu is only found in the Corruption, its Crimson counterpart is the Brain of Cthulhu.
- It is summoned by destroying three crimson hearts, or by summoning it with a Bloody Spine.
In a first run, Brain of Cthulhu is summoned every three Crimson Hearts you break with a hammer. Each one you break will let your world spawn Meteorites, which provide powerful armor and weapons, but also give some loot directly when broken.
If you need to summon the Brain, you can do so by crafting a Bloody Spine and using it within the Crimson at any time of day. The Bloody Spine is produced by taking Vicious Mushrooms (from grass in Crimson) to an alchemy station to transform them into Vicious Powder. You need 6 to make 30. Additionally, you require 15 Vertebrae from killing Crimson enemies.
Read also: Call of Cthulhu: A Must-Play for Horror Fans?
Preparing for the Battle
Boss battles can be won or lost before the battle ever starts. Prepare your Boss-fighting arena with adequate lighting, Campfires and Heart Lanterns for health regeneration.
- Always carry around a stack of the highest-tier healing potion available, as relying only on natural Health Regeneration is not a good idea.
- It is suggested to build houses for the Dryad and the Nurse NPCs in your arena.
Arena Setup
The best you can do while in the Crimson is make sure your character has a nice open area to run about in, which may mean using some Purification Powder to clear some Crimson blocks with a pickaxe. This is bought from the Druid.
I use platforms over any water to ensure I have room to run. A campfire and some level terrain goes a long way, so that you can avoid the brain when it begins teleporting later in the fight. The terrain will also collect hearts for you as you kill creepers.
Gear Recommendations
- For defense, the best armor to have at this point would be Gold Armor or Platinum armor, although they can be difficult to obtain.
- A full set of Silver Armor or Tungsten Armor is easier to get at this point, and it is a good choice for this fight.
I did this fight in Iron Armor and found it rough, so Silver/Tungsten would be even better. You will be, after all, jumping all the way past Gold/Platinum in terms of defense with the Crimson Armor!
Since you've defeated the Eye, you should have access to the Tendon Bow and Blood Butcherer as great weapons for defeating it.
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Bosses are displayed on the Minimap: Follow the boss's icon to track it when you're struggling to find it.
Battle Strategy
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.
Phase 1: The Brain itself is initially invincible. It teleports around the player, drawing nearer before teleporting away again in a random direction while its Creeper 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, forming groups and allowing the player to deal damage to all the Creepers at the same time.
Phase 2: In its second phase, Brain of Cthulhu will also flip gravity, which will prevent gravitation potions from working.
Tactics for Each Phase
- Phase 1: Focus on destroying the Creepers. Weapons with the On Fire! debuff are a useful choice for this battle, as Creepers are susceptible to damage from early game weapons such as Molotov Cocktails and Flaming Maces.
- Phase 2: The BoC will attempt to ram the player and teleport in random directions, which makes targeting and attacking it more difficult. The aforementioned Rotted Fork and explosive weapons are also useful for dealing effective damage to the BoC, with combined knockback and fiery debuffs allowing the player to keep clear from ramming attacks.
Weapons with high knockback such as the The Rotted Fork can keep both Creepers and the Brain from closing distance between teleports.
Read also: Description of Cthulhu
Brain of Cthulhu is very vulnerable to Frostburn and Flaming Arrows, but you can also smack him hard with a nice Blood Butcherer you got from crafting ore from Eye of Cthulhu.
Drink a potion if you get low on life and slash/shoot away while dodging its teleporting attacks and victory will not be far off.
Expert Mode Adjustments
In Expert Mode, the Brain of Cthulhu gains a 70% health increase. The Creepers gain a health increase of the same percentage, going from 100 health up to 170 health. Furthermore, both the Creepers (in the first phase) and the Brain (in the second phase) inflict a random debuff upon contact.
In Expert Mode, the BoC will spawn three mirror images of itself which become less distinct as the boss loses health. However, while they can all deal damage on contact, only the real one will possess a visible health bar.
Master Mode Adjustments
In Master Mode, the Brain of Cthulhu gains a 27.48% health increase. The Creepers gain a health increase of the same percentage, going from 170 health up to 216 health.
Rewards
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.
Crimtane Ore and Tissue Samples are your reward, and they're a major step toward conquering normal and moving on to Hard Mode.
Once the brain is down, you can make a full set of Crimson Armor for your efforts and it will last you all the way to the Underworld. You can also make Meteor Gear by mining a Meteorite should it land one night soon. More important is the Deathbringer Pickaxe you can make with the tissue samples, so that you can Mine Hellstone and Obsidian to make better gear for battling the Wall of Flesh and moving on to Hard Mode.
It is worth doing this fight a couple of times to ensure you get ample Tissue Samples and Crimtane.
Additional Tips
- 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.
- The Quad-Barrel Shotgun is an excellent weapon to use for the brain's second form.
- A campfire and some level terrain goes a long way, so that you can avoid the brain when it begins teleporting later in the fight.
By following this guide, you'll be well-equipped to defeat the Mechanical Brain of Cthulhu and progress further in your Terraria adventure!
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