Ducis Enbrion commands the Injieran knight army's elite First Holy Knight Corps, placing him at the apex of its military hierarchy. He serves as both mentor and trusted friend to Hewie Elzard, commander of the Seventh Holy Knight Corps. Ducis balances rational, sober strategy with the boldness needed to seize critical battlefield opportunities. Despite Hewie's propensity for risky plans, Ducis holds Hewie's capabilities in high regard, trusting him to overturn seemingly hopeless situations even with daring strategies. This deep trust coexists with Ducis's own concerns about the dangers inherent in Hewie's methods.

Ducis maintains a romantic relationship with Callaway, a member serving directly under his command in the First Corps. This creates tension between his professional duty and personal feelings, especially during military campaigns where her safety is threatened. He struggles to endure the possibility of harm coming to her in combat.

Engaged in the century-long war between Lushiera and Injiera, Ducis participates in offensive campaigns aimed at reclaiming century-lost territories. These involve coordinated efforts with other commanders, including Hewie and Hewie's subordinate, Aria. Operating within a military structure demanding loyalty and strict adherence to orders, Ducis nevertheless demonstrates concern for his subordinates' well-being beyond battlefield necessity. His leadership blends disciplined command with personal investment in those under his authority.