Biome Keys

Biome Keys are Hardmode, post-Plantera items used to open Biome Chests. Each key has a 0.04% (1/2500) chance of dropping from a monster in the key's respective biome. Biome Keys are consumed upon use. In the 1.3.0.1 update, key molds are no longer dropped, but instead the key itself. (like before the 1.2.1 update)

Any Biome Key dropped prior to defeating Plantera will display the tooltip "It has been cursed by a powerful Jungle creature" and will be unable to open its respective chest.