This item is randomly generated in stores or containers upon entering the map where it is located, or upon defeating an enemy. Its attributes are scaled to Hawke's level.
Other pieces of the Templar Superior Heavy Issue type might also be obtainable from Templar-related enemies. Templar Boots - Superior Heavy Issue confirmed as drop from the Templar chasing after Feynriel(, facing the Dalish hunters). Templar Helm - Superior Heavy Issue confirmed as possible drop from the Templar Hunter (during The Midnight Meeting).