This can be found off a bounty hunter in frostback mountains it can also be found in the vault room on the second floor of Arl Eamon's castle. This can be equipped as set with the knight commander's armour. It is also sold by Cesar in the Denerim market after The Trial of Crows quest. This helmet can also be found during the mission; Return to Ostagar. head across the bridge, past the tower of ishal, to the only other exit to the world map, it is past the wooden gate on your right in a wooden box near a wagon (note: the contents of these boxes are random; it will not always be present). This makes it possible to walk away with two Knight-Commander Helmets.