Adamantoise (Final Fantasy XI) Type Species Charmable Crystal Notes Adamantoise is a genus of enemies in Final Fantasy XI. Adamantoises are large, turtle-like monsters who are so named for the fact that their shells resemble the hardness and toughness of the adaman metal. These creatures have survived for incredibly long periods of time, thanks to the defensive nature of their shells and their ability to withdraw into it to not only protect themselves, but to heal themselves as well. These large creatures also have several abilities that allow them to weaken their adversaries, further increasing their own survivability.