Radamathys de Wyvern serves as one of the Three Judges of the Underworld within Hades' army, commanding the Wyvern division of Specters and overseeing the prison realm of Caina. His authority flows from the Celestial Fierce Star, granting power rivaling Athena's Gold Saints. He exhibits unwavering loyalty to Hades and frequently acts as Pandora's primary field operative, despite occasional strategic disagreements. Born human in England, Radamathys entered Hades' service after his "malevolent star" awakened. His background reveals noble origins; the Specter Valentine served him even before their underworld allegiance. A pivotal pre-series event saw him battle Leo Ilias in India. Though weakened by illness, Ilias broke one of Radamathys' Surplice horns before sacrificing himself to save his son, Regulus. This encounter instilled lasting respect for Ilias' strength in Radamathys. During the Sanctuary assault, Radamathys coordinated the Specter invasion of Athena's temple. Defying Pandora's orders, he deployed terrestrial-class Specters to monitor the resurrected Gold Saints, doubting their success in assassinating Athena. When the renegade Gold Saints Cancer Deathmask and Pisces Aphrodite attempted to infiltrate Hades' castle, he intercepted them. Reflecting Deathmask's Underworld Waves, he effortlessly defeated both using his signature technique, Greatest Caution. Following Athena's apparent suicide, he confronted the invading Gold Saints Leo Aiolia, Scorpio Milo, and Aries Mu within Hades' barrier—which suppressed their cosmos to 10%. Exploiting this advantage, he overpowered all three simultaneously. Only Pegasus Seiya's intervention, awakening his Eighth Sense and grappling Radamathys as they fell into the Underworld, proved effective. Within the Underworld, Radamathys faced Gemini Kanon, who mocked his reliance on Hades' barrier. Pandora summoned Radamathys away to oversee Orphée's lyre performance, a ploy to distract Hades. Radamathys alone resisted Orphée's hypnotic serenade and killed the Silver Saint during his assassination attempt on Hades. He later battled Seiya and Shun until Shun's possession by Hades halted the conflict. Radamathys subsequently defeated Seiya and cast him into the frozen Cocytus prison. In a final rematch against Kanon—now clothless after sending his Gemini Cloth to aid Saga—Radamathys inflicted lethal injuries with Greatest Caution. Kanon retaliated with a suicidal Galactic Explosion, annihilating both warriors. *The Lost Canvas* depicts an alternate narrative: Radamathys battled Scorpio Kardia in Atlantis. Kardia's fatal heart disease fueled a mutual burning of their hearts via Antares; Kardia perished while Radamathys survived. Later, after failing to secure Poseidon's Orichalcum, the Specter Pharaoh tested Radamathys' loyalty. He ripped out his own burning heart to prove devotion, earning a divine transfusion of Hades' Ichor that elevated him to near-godhood. As guardian of Saturn's Temple, he killed his subordinate Valentine for insulting Pandora but later deemed Hades' vessel, Alone, unworthy. He sacrificed himself to destroy a painting imprisoning Athena's essence, dying in Pandora's arms. Radamathys' primary technique, Greatest Caution, channels cosmos into typhoon-force winds or a wyvern-shaped energy blast capable of atomic destruction. *The Lost Canvas* also shows him employing Wyvern's Roar and Greeding Roar. His combat resilience allows him to endure Orphée's Perfect Chord and Kanon's first Galactic Explosion, and he possesses immunity to supernatural barriers like Hades' castle's power-dampening field.