| Console/Mobile-Only Content: This information (or parts of it) applies only to the console and mobile versions of Terraria.
- For tips on obtaining Key Molds, see Guide:Harvesting Key Molds.
Biome Key Molds are extremely rare Hardmode crafting materials exclusive to the console version and mobile version and are used to craft Biome Keys, which open Biome Chests. After the Wall of Flesh is defeated, every enemy has a 0.04% (1 in 2500) chance of dropping a Biome Key Mold. The type of Biome Key Mold that is dropped depends on the biome you are currently in (Jungle, Corruption, Crimson, Hallow or Snow).
On the Desktop version, Biome Keys will drop instead of Biome Key Molds, and all existing key molds will change into their respective keys.
- Unlike some real-world "molds", these are consumed in the crafting process and cannot be reused.
- Key molds can also be dropped by Bosses, like any other enemy, if the player is in the right biome.
- Enemies in artificially created Corruption and Crimson biomes will still drop appropriate key molds, even if the world does not have a corresponding biome chest.
- Key mold farms will still work as normal, but biome keys will be dropped instead of biome key molds.
- Although the key molds were removed in 188.8.131.52, their sprites still exist within the game files of the Desktop version.
- All key molds can be dropped by an enemy in that certain biome so you could use an event or spawn in after King slimes to farm the key mold.
- Keys to Biome Chests are now dropped instead of molds.
- Biome Chests can only be opened after Plantera has been defeated.
- All molds obtained in previous versions have been replaced with keys.
- 1.2.3: Drop chance increased from 1 in 4000 (0.025%) to 1 in 2500 (0.040%).
- 1.2.1: Introduced.