Achievement
Mastermind
Mastermind is a Terraria achievement. 
Brain of Cthulhu counts toward it.
Description
Defeat the Brain of Cthulhu, an enormous demon brain which haunts the creeping crimson.
What counts
Defeat:
Achievement
Mastermind is a Terraria achievement. Brain of Cthulhu counts toward it.
Defeat the Brain of Cthulhu, an enormous demon brain which haunts the creeping crimson.
Defeat: