Terraria Mods Wiki
Soul of the Master (Fargo's Mod).png
Embrace eternity...
Eternity Mode-Only Content: This information applies only to Eternity Mode and Eternity Mode worlds.
Brain of Cthulhu (Eternity Mode)
AI TypeBrain of Cthulhu AI
Damage54 (Contact)
36 (Creepers)
Max Life2125
6385 (with Creepers)
KB Resist55%
Immune toConfusedIchor (debuff)
Map Icon Brain of Cthulhu (Fargo's Mod).png
Map Icon

Focus on how the ichor moves and don't get overwhelmed! When the brain gets mad, it'll confuse you every few seconds. Four rings to confuse you, one ring when it wears off!

Fargo's Mod/DevianttDeviantt

For the vanilla page, see Brain of Cthulhu.

Eternity Mode Brain of Cthulhu is a pre-hardmode boss. It is a more powerful version of the Brain of Cthulhu with more attacks and new behavior.


Brain of Cthulhu's main behavior focuses on Ichor and illusions.

Phase 1[]

Brain of Cthulhu is invincible and randomly teleports around the player with several Creeper (Fargo's Mod).pngCreepers that have 250 HP following it. Creepers shoot a unique variation of Golden Shower (projectile).pngGolden Shower. These Golden Shower shots are initially aimed away from the player before turning around and homing in on the player. After approaching close enough, they stop in place and then accelerate to high speed while curving to hit the player. Their fire rate increases as the number of surviving Creepers decreases.

When all Creepers are dead, Brain of Cthulhu enters phase 2, becoming vulnerable.

Phase 2[]

Brain of Cthulhu spawns harmless illusions all over the screen that become more opaque as its health decreases. Additionally, it has one invulnerable clone that is able to damage the player; this physical clone cannot teleport and is only vulnerable to knockback at close range.

Brain of Cthulhu and its four primary clones all have identical icons on the map, preventing players from using the map to identify the real boss.

It periodically inflicts Confused, telegraphed by 4 rings of light that come from the Brain and its main clones, then spawns 4 bursts of Death Laser (projectile).pngaccelerating lasers around the player. When Confused is about to wear off, the real brain and a bunch of real clones that can deal contact damage will spaz out for a very short time before all of them simultaneously charge the player. During this attack, the brain is invulnerable.


Source Debuffs
Map Icon Brain of Cthulhu (Fargo's Mod).png Contact
Creeper (Fargo's Mod).png Creeper
Death Laser (projectile).png Laser

Broken ArmorBroken Armor
Golden Shower (projectile).png Golden Shower Ichor (debuff)Ichor


  • Unlike in Expert Mode, Creepers don't drop Crimtane Ore and Tissue Samples, but instead Brain of Cthulhu drops more of these materials to compensate.
  • If the Brain of Cthulhu teleports itself too close to the player, it immediately readjusts its position to prevent cheap hits.
  • Brain of Cthulhu drops a Red Stained Spine on spawn if it hasn't been defeated yet.
  • If Skeletron is defeated, Brain of Cthulhu can naturally spawn in The Crimson.


  • Since the fight has much more going on compared to Expert Mode, it is heavily recommended to fight it on the surface with a proper arena for more space to dodge.


  • If the Eternity Mode Recolors option is turned on in the Mod Configurations menu, the Brain of Cthulhu resembles the Hive Mind, while the Creepers resemble Servants of Ocram.
Fargo's Soul Mod:
Slime King's Slasher (Fargo's Mod).png Weapons • Squeaky Toy (Fargo's Mod).png Accessories • True Mutant Body (Fargo's Mod).png Armor • Sands of Time (Fargo's Mod).png Tools • Celestial Seal (Fargo's Mod).png Consumables • Top Hat Squirrel (Fargo's Mod).png Town NPCs • Mutant's Gift (Fargo's Mod).png Eternity Mode • Forbidden Enchantment (Fargo's Mod).png Guides