Wyvern Rhadamanthys serves as one of Hades' three Underworld Judges, bearing the title of Celestial Fierce Star and commanding the Wyvern Division. He oversees the hell of Caina within Cocytus. Physically, he stands 189 cm tall, weighs 84 kg, has blonde hair and a unibrow, with a birthdate of October 30. His origins are traced to either the Faroe Islands or the United Kingdom, depending on the continuity. As a Specter of Hades, Rhadamanthys possesses superhuman physical characteristics: atomic-level matter manipulation, energy projection, dimensional travel, and resistance to extreme conditions such as absolute zero. He operates at a multi-solar system to multi-universal level of power, capable of moving at immeasurable speeds and enduring attacks like Gemini Kanon's Galaxian Explosion. His primary techniques include **Greatest Caution** (or Maximum Destruction), concentrating cosmic energy into his palms for devastating blasts or area-of-effect waves, and **Wyvern Roar**, a cosmic energy-amplified sound-based attack. Rhadamanthys acts with ruthless efficiency and disregard for protocol. During the Hades Sanctuary arc, he defied Pandora's orders by deploying Specters to infiltrate Athena's Sanctuary, believing preemptive strikes necessary despite risks. This resulted in the deaths of traitorous Gold Saints Cancer Deathmask and Pisces Aphrodite, whom he overpowered and executed after reflecting Deathmask's soul-manipulation technique. Later, he exploited the Underworld barrier around Hades' castle—which reduced non-Specters' power to 10%—to defeat the combined forces of Gold Saints Leo Aiolia, Scorpio Milo, and Aries Mu single-handedly. His tactical acumen is evident in multiple encounters. He deduced Gemini Kanon's role in manipulating Balron Lune and survived several confrontations with him, acknowledging Kanon as a formidable adversary. In their final battle, Kanon sacrificed himself to destroy Rhadamanthys, resulting in both their deaths. Rhadamanthys also thwarted Lyra Orphée's assassination attempt on Hades by intercepting Orphée's lullaby and using Pegasus Seiya as an unwilling projectile to kill the musician. Personality-wise, Rhadamanthys displays unwavering loyalty to Hades, often invoking his name. He exhibits contempt for insubordination yet shows flashes of camaraderie, such as concern for his subordinate Lune. His brutality is tempered by moments of genuine fear, notably during Kanon's suicide attack, where he panicked and attempted negotiation. Across media, he maintains a role as Pandora's de facto enforcer, balancing strategic aggression with pragmatic caution.