All the Elite classes from Halo 4.
The most common and least experienced Elites, Minors are still extremely skilled warriors. They possess shields that are weaker than Majors. They are the possible Covenant equivalent of a Sergeant in ranking. Along with Majors, they often lead squads of Grunts into battle.
Majors holds the ranking equivalent of a UNSC Lieutenant or Captain. Overall they are more agile, more accurate and more aggressive than Minors and rarely make tactical mistakes in combat. A single Major can hold its own against an entire squad of UNSC Marines. They can be seen leading Grunts and Minors into battle.
Rangers are primarily used in space. They wear spacesuits and jetpacks.
Zealots are elite warriors whose job is usially to retrieve artifacts.
Generals are the highest-ranking military personnel employed by the Covenant among their groundside forces. They have a heavy amount of shields and an incredible amount of health.