Calamity Mod Wiki
Rotten Brain
  • Rotten Brain.png
Stack digit 1.png
TypeAccessoryCrafting material
Tooltip10% increased damage when below 75% life
5% decreased movement speed when below 50% life
Shade rains down when you are hit
RarityRarity Level: 3
Sell 80 Silver Coin.png
Projectile created
Aura Rain
Shade Rain
Dropped by
The Hive Mind1100%

The Rotten Brain is a Pre-Hardmode accessory dropped by The Hive Mind. It will grant a 10% increase to all damage types when below 75% hp, decrease movement speed by 5% when below 50% health and makes shade rain down on you when you are hit. It is also sold by the Dryad after The Perforators are defeated.


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  • Shade rain deals magic damage and benefits from magic bonuses. However, its damage cannot be increased through any means.
  • The shade rain has a base damage of 18.