A Behemoth should be paralyzed with Thunder or Thundaga, then the player should keep attacking until it is down. The player should also make sure s/he has a couple Phoenix Downs on hand. Another strategy is to remain on the planks and target it with ranged spells. Because of its massive size, it is unable to follow the player any further should s/he choose to retreat.
[view·edit·purge]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."