Gravity throne

Gravity Thrones are the mode of transportation for the higher Prophets of the Covenant. Instead of walking, they choose to sit on these levitating thrones most of the time. The High Prophets have a version which is equipped with a shield that is impervious to nearly all small arms fire.

It is also equipped with a modified version of the Assault Cannon(a version of the Hunter's weapon or Fuel Rod Cannon.) This weapon is called a Gravity Cannon.

It appears that each throne has a holographic projector, the Hierarchs' including a series of small holographic buttons that can perform a variety of commands located on each armrest.

Lesser Prophets do not appear to use these thrones as often, but Prophets serving military roles (such as the Legate) have Gravity Thrones of their own, though the version they use is less advanced. Other, usually lesser, prophets also use Antigrav Belts.

Fleet Master Elites use a lesser but similar Gravity Throne without weaponry as seen in Halo 3. Ship Master Rtas 'Vadum sits in one and gives it to the Arbiter in the end.

In Halo 2, various mods made the Gravity Throne a drivable vehicle.