Màscara de Plata, also known as Hilmes or Silver Mask, serves as the narrative's primary antagonist. The son of Pars's murdered King Osroes V, he witnessed his uncle Andragoras III orchestrate a coup that claimed his father’s life. Andragoras seized the throne and married Hilmes's mother, Queen Tahamine. During the uprising, Hilmes suffered disfiguring facial burns—a trauma that ignited his relentless quest for vengeance and drove him to conceal his scars beneath a silver mask, symbolizing his hidden identity.

Exiled from Pars, Hilmes allied strategically with Lusitanian forces, harnessing their military might to invade his homeland. His tactical genius proved decisive at the Battle of Atropatene, where he exploited Parsian general Kharlan’s betrayal to orchestrate King Andragoras’s defeat and capture. Later, during the siege of Ecbatana, he breached the palace defenses through hidden tunnels, enabling the capital’s fall.

His vendetta targets not only Andragoras but also Prince Arslan, whom he deems an illegitimate heir obstructing his rightful claim to Pars’s throne. This rivalry sparks direct clashes, such as his assault on Arslan at Peshawar. Though allied with Lusitania, Hilmes views the partnership as temporary; he plans to betray them once they outlive their usefulness, positioning himself to rule Pars alone.

The murder of his father, his own near-fatal assassination attempt, and his mother’s forced marriage to Andragoras fuel his ruthless pragmatism. This drives actions like the massacre of the Zott Clan and his manipulation of factions across Pars and Lusitania. His antagonism stems from a conviction that he must reclaim a stolen legacy.

Hilmes’s journey intertwines Pars’s fate and Arslan’s growth, gradually unveiling his identity through pivotal encounters—most notably when he reveals his scarred face to the captive Andragoras, declaring his true name and intent to seize the throne.