Priors are a special class of servants of the Ori, serving as a class of advanced priests and elite soldiers.
Priors are easily discernible by their pale completion and white eyes and are normally clad in white robes. Priors generally travel unarmed save for a staff, but they have powerful psionic abilities, including the ability to throw adult humans kilometers away with telekinetic force, create deadly plagues, bring the recently dead back to life, cause earthquakes, and create a shield able to protect them against small arms fire.
Priors are generally selected for their fervor. As a failsafe, Priors have a self-destruct mechanism built in: should they decide to abandon Origin or their missions, they spontaneously combust.