Dortesheim Eristein, Duke of the Elistein Magic Kingdom, is the brother of King Gilmar Eristein and uncle to Princess Charlotte Eristein, placing him within the royal lineage. He possesses gray hair, blue eyes, facial hair including a beard, and an apparent senior age, often seen wearing a cape and associated with sword-fighting. Dortesheim leads traditionalist factions opposing King Gilmar's policies of sharing magical knowledge and resources with neighboring realms, viewing such cosmopolitan approaches as a threat to Elistein's superiority. This ideological conflict escalates into civil war, with Dortesheim commanding rebel forces. During the conflict, he employs extreme measures, including the forbidden magic "Bloody Rhapsody," a spell inducing berserk rage in soldiers causing indiscriminate attacks and widespread chaos, such as at Marwalt. He collaborates with antagonists like the dark magician Inimeex, who casts large-scale destructive spells under his direction, and his forces employ controlled magical entities like a twin-headed dragon in combat. Following defeat by Taichi Nishimura and allies, who disrupt "Bloody Rhapsody" and thwart Inimeex, Dortesheim shifts from antagonist to a reluctant ally, assisting in addressing the immediate threats posed by the unleashed dark magic due to its greater danger to the kingdom. This involves a pragmatic acceptance of peace. His character exemplifies internal strife and the consequences of prioritizing tradition over unity within the kingdom's nobility.