Fleetmaster

The Fleet Master is a high-ranking Elite within the Covenant. This grade of Zealot commands Task Forces and small fleets.

Rank
Fleet Master is the highest version of Zealot except for Supreme Commander. Whenever a small fleet is needed for any mission away from the entirety of the Covenant fleet, a Fleet Master commands those ships during that task. This shows they could be the Covenant equivalent to a UNSC Rear Admiral. They may also command the entire fleet if the Supreme Commander or the Imperial Admiral would die during space combat.

They normally operate from a large warship, as a Reverence-class Cruiser, but not as big as a Assault Carrier or Supercarrier. This can especially be seen in Halo:Ghosts of Onyx, as the Imperial Admiral Xytan 'Jar Wattinree commanded from a Supercarrier, while the Fleet Master (Voro 'Mantakree), operated from a Reverence-class Cruiser.

Armor
Like all Zealot Elite ranks, the Fleet Master has golden armor. If other ranks were assigned this role, no changes in their armor are likely to be made.

Other Ranks
The Arbiter, should their role ever require it, could probably be assigned the role of Fleet Master. As well, should Councilors decide to get involved in military operations, they too could probably have the authority of rank to command a fleet, even having Zealots subordinate to them.

Role
Only one Fleet Master is officially known, Voro 'Mantakree, who commanded a small task force to Onyx in order to follow the Covenant Destroyer Bloodied Spirit.

Trivia

 * When Voro 'Mantakree was promoted from Major Domo to a Zealot Fleet Master, an extra part was added to his name. Making his name, Voro Nar 'Mantakree.