EX Crystal Guardians reveals another new area; a mysterious island, far from the city of Holon, which is a place where Pokémon, both regular and Delta Species, live in harmony. The island also bears naturally growing crystals, which are said to grant special powers if used correctly. These crystals form the basis of many of the set's Trainer cards: Cessation Crystal, Crystal Beach, Crystal Shard and Mysterious Shard. The set includes cards from the Miracle Crystal expansion as well as from the set's two Japanese half decks.