Exxo Avalon/Biome Key Molds

Biome Key Molds are extremely rare Hardmode crafting materials that are used to craft, which open. After the Wall of Flesh is defeated, every enemy killed within an eligible biome has a 1/2500 (0.04%) chance of dropping the Contagion/Underworld Key Molds, and 1/2000 (0.05%) chance of dropping the Desert Key Mold, with the exception of Meteor Heads and statue-spawned enemies. The type of key mold that is dropped depends on the biome the player is currently in (, Desert, or Underworld).