Gusion

Gusion is a Djinn with the power to influence the movement of the planet's tectonic plates and resided in the 11th Dungeon. It was one of Barbarossa's two Djinn, but returned to its Dungeon after its capturer's death.

History
Gusion lived in Alma Torran and was part of King Solomon's Household. Gusion was turned into a Djinn by Solomon via the Rukh, and then dwelled in one of Alma Torran's underground cities, waiting for a Dungeon portal to be raised on the new world.

Around 13 years before the start of the main series, its Dungeon appeared and was conquered by Barbarossa.

Plot
When Sinbad killed Barbarossa, Gusion returned to its Dungeon.

Djinn Abilities
As a Djinn, Gusion can alter its size and rules over its Dungeon. It uses Magic to manipulate the movement of tectonic plates, which is a skill it passes on to its chosen King.

Dungeon Capturer
Gusion's former Dungeon Capturer was Barbarossa.

Djinn Equip
Full Djinn Equip: Barbarossa mastered Gusion's Djinn Equip and used it during Parthevia's attack on Sindria.
 * Extreme Magic: With his Extreme Magic, Barbarossa forced the tectonic plates to fluctuate in order to cause an earthquake, greatly damaging Sindria. A great amount of Magoi is necessary to use this Magic, so much so that Barbarossa needed to be supplied with additional Magoi by Al-Thamen members, who still could not keep up with his demand.

Trivia

 * This Djinn's name is taken from the book . In the first section of this book, entitled Ars Goetia, several demons are described, Gusion being the eleventh.
 * Gusion and Glasya-Labolas, Barbarossa’s first Djinn, are the only known Djinns whose capturer died and who subsequently returned to their Dungeons.