Rotten Brain

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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
Research1 required
Projectile created
Shade Rain
Shade Rain
Dropped by
The Hive Mind1100%

The Rotten Brain is a Pre-Hardmode accessory that is dropped by The Hive Mind. When equipped, it increases all damage by 10% when the player is below 75% health and reduces the player's movement speed by 5% when they are below 50% health. When the player takes damage, 6-7 shade raindrops fall from the sky which deal a base damage of 18.



Crafting Station
Tinkerer's WorkshopTinkerer's Workshop and Ecto Mist
Bloody Worm ToothBloody Worm Tooth1
Rotten BrainRotten Brain1

Used in


  • Shade rain deals magic damage and benefits from magic bonuses. However, its damage cannot be increased through any means.


These history sections are still a work-in-progress, and may not yet contain changes relevant to the current version of the Calamity Mod.
  • Can now be swapped with Bloody Worm Tooth at a Tinkerer's Workshop in Ecto Mist.
    • Projectile rains are now on set timers and no longer spawn randomly.
    • Projectiles no longer pierce enemies.
  • Rain projectiles now produce less dust.
  • Nerfed damage boost when below 75% health from 15% to 10%.
  • Can now be sold by the Dryad after defeating The Perforators.
    • Buffed damage boost when below 75% health from 10% to 15%.
    • Resprited.
  • Shaderain projectiles now produce less dust.
    • No longer gradually increases damage and lowers speed as the wearer's health lowers.
    • Now only increases damage when below 75% health and decreases speed when below 50% health.