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A Trial Key is an item used to unlock Vault Blocks found in Trial Chambers, granting access to valuable loot. There are two types of Trial Keys: the regular Trial Key and the Ominous Trial Key, each obtained in different ways. A Trial Key can be obtained by looting Corridor Decorated Pots, finding it in the Entrance Room, or as a possible reward for completing a Trial Spawner challenge. These keys are used to open standard vaults within the Trial Chambers.