Parmenio is one of the core worlds of Ultramar, a heavily populated and industrious planet whose plains and highlands serve as the great muster-grounds of the realm. Across its open country stretch training ranges and marshalling fields where the defence auxilia of the eight worlds gather to drill, and where the Space Marines who guard Ultramar conduct their vast war-games.
The world is a place of ordered discipline, its cities orbited by supply stations and its manufactories turning out the materiel of endless campaigns. Generations of Ultramarian soldiery have learned the arts of war upon Parmenio's dusty plains, so that when the call to arms comes, the sons of the realm march out already hardened in the ways of battle.
Parmenio has not escaped the galaxy's darkness. In ages past its ranges became true battlefields when war came to Ultramar, and the same fields worn smooth by drilling boots have run red with the blood of defenders. Yet the world endures, a whetstone upon which the realm sharpens its swords, forever preparing for the next enemy to breach the borders of the primarch's dominion. To serve on Parmenio is to understand that in the Imperium, peace is merely the interval in which one readies for the coming slaughter.