Behemoth from FFXI
The Behemoth is named after a Biblical creature from the Book of Job as a large herbivore and the land version of Leviathan. In many of the Final Fantasy games, the Behemoth is a large, purple beast that uses its horns and magic to kill its opponents. It first appeared as a boss in Final Fantasy II's Coliseum, and has been a series staple ever since. Behemoths are estimated to be ten to twelve feet tall when standing. When attacking, it normally dashes on all fours, but when returning to an idle state it will usually stand upright. In battle, it will counterattack with a powerful horn rush and Thunder magic attacks. A more powerful version of the Behemoth, King Behemoth (Sr. Behemoth in the original US translation), is a major enemy in the latter stages of many Final Fantasy games; they are often characterized by their large size (25ft when standing) and grey color. Behemoths are noted in later games as having a final powerful strike, usually Meteor, that is performed as they die.
In Final Fantasy Mystic Quest, Behemoth is uncharacteristically the opponent in the game's introductory battle. In Final Fantasy VI, the Intangir is an invisible variation of Behemoth that cannot be attacked physically; moreover, the creature uses sleep magic, because its name denotes a creature of sleep. In the same game, Behemoth King is a boss in the World of Ruin that will continue to fight in zombie form after its defeat. In Final Fantasy VIII, the boss Catoplebas is a variation of Behemoth, and in Final Fantasy X a special monster called Catoblepas could be created through the Monster Arena. In Final Fantasy II: Soul of Rebirth, a secondary story for Final Fantasy II Dawn of Souls on the Game Boy Advance, A palette swap of Behemoth is used for the Ultima Weapon, which guards the Ultima Tome. In Final Fantasy XII, Behemoths are a class of monsters, generally similar to previous incarnations except that they are bipedal and more humanoid looking. Only the Behemoth King bears similarity to the previous games' depictions. In Dirge of Cerberus: Final Fantasy VII, we encounter Azul the Cerulean as the Arch Azul in the underground world of Midgar, who transforms into a form similar to a Behemoth. Behemoth has been seen in all numbered installments except I, in addition to Chocobo's Dungeon 2, Chocobo Racing, Chocobo Land: A Game of Dice, Final Fantasy Fables: Chocobo Tales, Kingdom Hearts and Itadaki Street Portable. Alternative names include King Behemoth, Alteci, etc. The Behemoth makes an appearance in the opening movie of Final Fantasy XI and it also appears in the game as a Notorious Monster. The Behemoth is one of the largest Heartless in Kingdom Hearts.
In Final Fantasy IV, Behemoths guard Bahamut and Zemus, appear to more closely resemble Eastern Dragons. They rarely attack the party, but counter-attack with devastating power to any melee or magical attack.