Behemoth appears as different types of enemies in the dungeons. A Behemoth family of stone carvers live in the village. By helping them, Chocobo may be able to get summoning feathers this way.
Behemoth is the mighty magical monster of Vulcan-O Valley, and the guardian to the portal into Fantasia. He keeps the last piece of Magicite. His ability is Charge, which speeds up Behemoth to ram racers off of the track. He drives the Behemo-Buggy 99. His theme is a remixed version of the cave theme from Final Fantasy III.
Behemoth lives in the caverns of Mt. Magma, and is ensnared under Irma's control by her Black Crystal to act as an obstacle against Chocobo. While under her control, he spoke with terrible grammar, stringing together sentences like "Me am victory" (of which Shirma points out). Once he is free of her influence though, he proves to be quite eloquent and articulate, speaking in a somewhat English accent.
Behemoth is a beast mentioned in Job 40:15–24. In addition to mythological creatures, it is likened to elephants, hippos, rhinos, and bison. Metaphorically, the term behemoth denotes "an extremely large or powerful entity."