I came across 'this' thing [duplicate]
Solution 1:
Those are Crimson Hearts. They're roughly equivalent to the Shadow Orbs that you find underground near the Corruption. Every third one smashed will spawn the Brain of Cthulhu boss.
Those are Crimson Hearts. They're roughly equivalent to the Shadow Orbs that you find underground near the Corruption. Every third one smashed will spawn the Brain of Cthulhu boss.