Dark Behemoth is an enemy fought at Arubboth and the Arcane Labyrinth. It fights using only a very powerful physical attack, so Blink and Protect are key spells to use in defending against it, while magic attacks work well due to its low Magic Defense.
Dark Behemoth is an enemy fought at Dragons' Den. It starts the battle by casting Mighty Guard, then attacks with powerful physical attacks and Heave, and when defeated, will either cast Meteor or Ultima.
Dark Behemoth is the strongest of the Behemoth family, having very high HP and, with the help of an unit with Beastmaster, can use the powerful Almagest ability. They are unable to use the Gigaflare or Twister spells that earlier Behemoths are capable of using.