The Covenant is a vast empire of seven alien species following the footsteps of the Forerunners. The Covenant believe that the Halo rings when fire they would become gods.
The covenant are form by:
The Prophets(Leaders of the Covenant)
The Elites(High military force and high council ranks, but in halo 2 events they were betray by the prophets.)
The Brutes(The newly race that join the covenant, in halo 2 events they replace the elites and became sub leaders of the covenant)
The Grunts(Are a small size alien race they serve as a military force they are not brave and run from battlefields)
The Jackals(The jackals are a bird like race that serves as snipers and they are cowards and will not sacrified their lives over the covenant)
The Hunters(The hunters are a worm like race with heavy armor cover their entire body they are extremely dangerous)
The Drones(The drones are a insect race that was force to join or they accept the covenant offer and they see the prophets as their queens)