Biome Keys

When in hardmode 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 Ice). These molds are then crafted into keys by using a Temple Key (dropped by Plantera) and Hardmode "Mechanical" boss Souls. These keys can then be used on their respective Biome Chest. The key is consumed when the lock is opened.