// Bosses · brain-of-cthulhu
Brain of Cthulhu
brain-of-cthulhu
Pre-Hardmode progression tier
How to beat Brain of Cthulhu — full strategy guide
Summon, arena prep, recommended loadouts by class, drops and next targets
How to summon
spawn rulesBloody Spine, or break 3 Crimson Hearts.
- biomeCrimson
- eraPre-Hardmode
Composite Breakdown · 6 layers
each fragment is its own NPC →
Notable drops · 4 items
loot
Frequently asked
common questionsHow do you summon Brain of Cthulhu? +
Bloody Spine, or break 3 Crimson Hearts.
When should you fight Brain of Cthulhu? +
Brain of Cthulhu is a Pre-Hardmode boss — best attempted once you have gear matching that progression tier.
