The Covenant is a religious empire of a multitude of Alien races. The Covenant Empire controls a vast portion of the Orion Arm in the Milky-Way Galaxy, one that dwarfs what Humanity controls. The Covenant worship the Forerunners and the Halo Arrays, with the aliens known as the Sangheili leading the other races through on spiritual expansions and explorations. The Covenant was eventually tricked in to war against the UNSC by those they knew as the Prophets. During 2552, the Covenant Empire was destroyed, forming splintered groups.