It has all of six Covenant species, including actually threatening Brutes Heretics behave differently to regular Covenant On top of all of the Covenant vehicles you have to fight, the Flood sometimes control Human vehicles, including tanks There are two varieties of Sentinels and also the huge Enforcers And there are the Heretic Leader, Prophet of Regret and Tartarus fights And in the Gravemind/High Charity levels the different Covenant species all fight each other and the Flood Anyone else agree?