Colonel Royez is in charge of the NCR camp on the Long 15, managing supplies between California and the Mojave Outpost. Royez sports the unique Scorched Sierra power armor which is decorated with a taxidermized bear head and some ornamental pieces. The fact that he is the only one having a suit of functional power armor in the NCR army and therefore possesses Power Armor Training speaks volumes of his status.
He and his squad are encountered in the irradiated Long 15, amidst the wreckage of 3 crashed Vertibirds. He has very high, "boss-like" health and high DT from his armor. He also has rapidly regenerating health.
Colonel Royez uses over charged micro-fusion cells instead of standard cells, giving his plasma caster increased damage and armor penetration. He deals very high damage and can kill a level 50 character in just three or four shots.
Unlike most non-player characters in the game, he has 10 points in every special stat and has four tag skills all at 100, making him that much more difficult to defeat.
Because Colonel Royez is immune to knockdown, he simply freezes in place when he suffers a critical hit from the Compliance Regulator.
Royez is one of the few named NPC's that wear power armor along with Paladin Ramos and Paladin Sato, companions being an exception.