Berial is an archduke in the Demon World. A four-eyed demonic bat named Boi Boi often sits on his shoulder. He was the one who proposed to the Great Demon Lord Megido of the Lava and his peers for them to ally with Demon Card, as part of the organization's ambitious Project: Dark Rendezvous. He uses the Six Star Dark Bring G-Earth, which allows him to manipulate the ground.

-Wikipedia