Biome Keys

When in hardmode every enemy has a 0.025% (1 in 4000) chance of dropping a Dungeon Key. The type of Dungeon Key that is dropped depends on the biome you are currently in (Jungle, Corruption, Crimson, Hallow or Ice). It can be used to open a Dungeon Chest of the same color. Farming theses keys can take multiple play sessions as they are very rare.

Tips

 * While Blood Moon or similar events, travel to the biome you want to find a key in. The massive amount of enemies will help you to get the key.
 * Meteor Heads spawned by a Meteorite biome (artificial or otherwise) can also drop the key for the biome it is contained in.
 * It is also possible to make a potential AFK farm by taking advantage of the Leaf Crystal granted by the Chlorophyte armor set. The crystal will automatically destroy any meteor heads in range with a single hit, resulting in very minimal effort on the user's end.