There are a lot of races in halo there are Forerunner, Elites, Jackals, Grunts and, Hunters. Forerunner is what made the rings that gives HALO its name. The were the smartest of all races they built the rings that destroy a life forms the made it so they can make the AI turn into human. The Elites are the assassins to the covenant army they are the fast and brave ones that challenge the spartans. Jackals are like the Elites but have less armor and have a shield to defend them in battle. The grunts are the weak scared little race that is almost useless they are mostly used for running up to battle with only grenades most of the time a decoy. Now the Hunters are the big tanks of the covenant army they have a fuel rod cannon built in there hand with a shield, mostly made of armor. The only way to get rid of them is there back which is always open at most times, they are very good at hunting down their targets and they arrive in fleets of 2.