Terraria Mods Wiki
Treasure Bag.gif Expert Mode-Only Content: This information (or parts of it) applies only to Expert mode and Expert mode worlds.
Rotten Key
  • Rotten Key item sprite
TypePet Summon
TooltipThe key to pacifying a microbial cluster
Grants BuffCalamity's Vanities/Cluster Mind (buff)Cluster Mind
Buff tooltipA small pack of microorganisms are following you
RarityRarity level: 3
Buy / Sell80 / 1
Dropped by
Entity Quantity Rate
The Hive Mind 1 30%
Summons Pet

Cluster Mind

Cluster Mind (Calamity's Vanities).gif

The Rotten Key is an Expert Mode-exclusive pet summoning item obtained from the Treasure Bag dropped by The Hive Mind or bought from the Oracle after The Perforators and The Slime God have both been defeated. It summons a small Hive Mind follow the player.


  • The item can also be obtained from the Starter Bag if the player is named "Potato Person".