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I found this heart while exploring the crimson biome - what is it?

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up vote 7 down vote accepted

That is a Crimson Heart. You can smash it with a hammer to get an item. Every 3rd Crimson Heart that you smash will summon the Brain of Cthulhu boss, so make sure you're properly equipped before smashing your third one.

Each world can have several instances of the Crimson biome, depending on world size, and each chunk of Crimson biome will have several Crimson Hearts. In a large world you can expect in excess of 20-30 Crimson Hearts throughout.

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Someone plays a lot of Terraria! Can there be more than 3 in a server? – Mkalafut May 1 '14 at 20:05
Oh...about 500 hours on record, so I'd say yes. – mouseas May 1 '14 at 20:06
They're the Crimson equivalent to the Corruption's Shadow Orbs – mmatthews May 1 '14 at 20:31
@Waterseas Oh, I agree! I just don't have quite that much time under my belt with it =) – Mkalafut May 1 '14 at 20:38
@Mkalafut there are usually a lot more than just three in each crimson biome. – Philipp May 1 '14 at 20:45

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