Though rarely seen in combat, the Protos-pattern Scarab is equipped with a focus cannon that is among the most powerful to ever be mounted on a Covenant walker. This armament is best suited for artifact retrieval purposes, for which the Protos possessed specialized sensor arrays. Like the other Scarab variations, the Protos-pattern Scarab utilizes colonies of Rhulolekgolo to control its exoskeleton. Despite generally being used in non-combat roles, the Protos was deployed during several conflicts late in the Human-Covenant War, such as those on Meridian, Reach, Earth, and Installation 05.