GRUNT (Unggoy)

Short and broad bipedal arthropods. Known to speak several human languages. Have a distinct vomit/manure smell about them.

Typically travel in groups up to eight. Lack discipline; tend to panic once local command has been eliminated. This will occasionally manifest itself as a suicidal attempt to eliminate the forces that eliminated its commander(s).

DRONE (Yanme’e)

Tall, flying multi-limbed arthropods. Rapid clicking vocalizations. Have a slight musty odor associated with them.

They always travel in groups of four or more, are well disciplined, and extremely aggressive. Drones are best described as irregular troops—their high morale and fierceness may be biochemical in nature.

HUNTER (Lekgolo)

Gigantic, heavily armored bipeds. They don’t speak often, but when they do it will sound like a thunderous, subsonic rumbling. They travel in pairs and exhibit excellent discipline, unwavering morale, and steady focus.

Hunters should be thought of more as mechanized weapon platforms rather than single enemy combatants.  Avoid engagement whenever possible.

BRUTE (Jiralhanae)

Massive and ape-like. Many have been observed speaking human languages. Depending on location and MOS they will be encountered in groups up to eight.

They are fearless, vicious opponents and must not be underestimated. Currently, they fill the command role that Elites occupied previously. Whether or not this is indicative of a power shift within the Covenant is of no consequence to the current operation. ANYTHING that seeks to obstruct the successful completion of your mission is a legitimate target.

JACKAL (Kig-yar)

Tall and lanky saurians. Most of their vocalizations may be described as barking or a ratchet-like grunting. There is a salty, occasionally acrid, smell associated with them.

They are typically found in small (one or two individuals) sniper/scout detachments or marksman half-squads (one marksman and three short range security). What they lack in overall discipline they make up for with bloodthirstiness.

Intel provided by: Bungie.net