They are fearless warriors that ensure that their jobs are done well. They were enemies in the levels The Arbiter and The Oracle. However, the High Prophets sent in squads of Special Operations Elites and Grunts, accompanied by the Arbiter, to quell the heresy and the group infiltrated the mine and completed their objective. Most of, if not all, the Majors were killed when the gas mine fell into the depths of Threshold, after the Arbiter cut the cables holding the mine up.