The New Covenant is the successor of the Old Covenant which was disbanded after the Prophet of Truth was killed by the Arbiter. It was founded by the Sangheili to bring honour back to the Covenant. Instead of the old Theocratic government, the New Covenant is more of a Meritocracy. This insures that species cannot dominate the Covenant merely by being favoured by the leaders. It's technology is the same as the old Covenant, and it's members generally the same, but it excludes the Jiralhanae and the San'Shyuum. The New Covenant is allied with the UNSC, and are enemies of the Covenant Remnants.