Temple Key

The Temple Key is dropped by Plantera, and is spend to unlock the Lihzahrd temple, which contains numerous end-game content.

It is also used in the creation of Dungeon Keys.

Trivia

 * The sprite of the key seems to resemble a fist, like the one used by Golem inside the temple.
 * The sprite of the key seems to be the only one that faces right, rather than downwards.