Behemoth

Behemoth is a powerful Heartless. It was one of three powerful Heartless released by the final Keyhole, which is also the Keyhole to Hollow Bastion. The other two were Phantom and Kurt Zisa. While the other two left to destroy other worlds, the Behemoth remained and guarded the keyhole.

There were multiple Behemoths; although the main Behemoth was found in the Radiant Garden, other Behemoths were found in the Olympus Coliseum and End of the World. They were all battled the same, though. Sora sometimes battled Destroyed and Arch variants.

Trivia

 * Two Behemoths were seen during the War of 1000 Heartless. However they were not part of the battle.