Wyvern Rhadamanthys is one of the three Judges of the Underworld within Hades' army of 108 Specters, alongside Griffon Minos and Garuda Aiacos. He commands the Wyvern division and governs the prison realm of Caina in the Underworld. His power originates from the Celestial Fierce Star. Rhadamanthys displays absolute loyalty to Hades and follows orders from Pandora, Hades' primary lieutenant. He hails from the Faroe Islands in the main continuity, while The Lost Canvas spin-off places his birthplace in the United Kingdom. Rhadamanthys is 23 years old in the primary timeline and 28 in The Lost Canvas. He stands 189 cm tall, weighs 84 kg, possesses blond hair, golden eyes, and blood type O. He has a cousin named Ketos Chris. Rhadamanthys wears the Wyvern Surplice, armor providing multi-universal durability. His combat abilities include superhuman physical traits, immortality granting resurrection and regeneration, matter manipulation at the atomic level, energy projection, dimensional travel, soul manipulation, and resistance to extreme conditions like absolute zero temperatures and high-voltage electricity. He wields the Seventh Sense, enabling him to perform miracles, amplify his statistics, and fight without physical senses. His signature technique, Greatest Caution, concentrates cosmos into his palms to unleash devastating energy blasts or typhoon-force winds. His secondary technique, Wyvern Roar, channels cosmic energy through his voice to generate destructive soundwaves. In the Hades Chapter - Sanctuary, Rhadamanthys emerges as one of the most formidable Specters, possessing power comparable to Athena's Gold Saints. He often operates independently, disregarding orders he deems counterproductive to victory. Against Pandora's commands, he dispatches a covert task force to infiltrate Athena's Sanctuary and monitor the resurrected Gold Saints. After their failure, Pandora punishes him, though he retains his position. He later confronts and defeats the renegade Gold Saints Cancer Deathmask and Pisces Aphrodite, reflecting Deathmask's own Underworld technique to destroy both. He sends another group led by Cyclops Gigant to attack Sanctuary despite Pandora's disapproval, accepting responsibility for the resulting losses. When Leo Aiolia, Aries Mu, and Scorpio Milo invade Hades' castle seeking entry to the Underworld, Rhadamanthys confronts them. An Underworld barrier reduces the Gold Saints' cosmos to 10%, while Rhadamanthys retains 100% strength. He overpowers all three, leading to their sacrificial defeat. He later encounters the Bronze Saints Pegasus Seiya, Andromeda Shun, Dragon Shiryu, and Cygnus Hyoga. Their Athena-blessed Cloths prevent power reduction, yet Rhadamanthys dominates them until subordinates intervene, after which he departs for the Underworld. Within the Underworld, Rhadamanthys breaks Gemini Kanon's illusion cast on Specter Balron Lune. After Kanon defeats Lune, he challenges Rhadamanthys directly. Their battle reveals Kanon's capability to repel Greatest Caution, forcing Rhadamanthys into a defensive position until interrupted by other Specters. Later, during Lyra Orphée's assassination attempt on Hades, Rhadamanthys feigns sleep while others succumb to Orphée's music. Suspecting treachery, he impales Orphée through the chest. When Seiya and Shun intervene, Rhadamanthys withstands Seiya's Pegasus Ryu Sei Ken, though it damages his Surplice. Orphée sacrifices himself to bind Rhadamanthys, enabling Seiya's attack, which fails to inflict lasting injury. Rhadamanthys' final confrontation occurs against Kanon in the Inferno chapter. His Greatest Caution proves ineffective as Kanon blocks it with one hand, having adapted. Kanon gains a decisive advantage, exacerbated by Rhadamanthys' accumulated injuries. Fellow Judges Minos and Aiacos intervene to rescue him, though Rhadamanthys displays frustration. Later, Kanon discards his Gold Cloth and initiates a suicidal attack. Initially dismissive, Rhadamanthys experiences terror upon realizing Kanon's intent. Despite his fear and attempts to negotiate, Kanon's Galaxian Explosion engulfs them both, resulting in Rhadamanthys' defeat and demise. In The Lost Canvas spin-off, Rhadamanthys awakens early as a Specter serving Pandora directly. He attacks Leo Regulus Ilias in India, overwhelming the ill Saint. Ilias breaks one of Rhadamanthys' horns before sacrificing himself to save his son. Rhadamanthys later participates in missions to Atlantis to secure Poseidon's Orichalcum, wounding the marine general Unity. He battles Scorpio Kardia and Aquarius Degel, surviving Kardia's Scarlet Needle Katakeo through tactical misdirection but succumbing to a secondary strike. Despite severe injuries, he survives. After Hades (as Alone) questions his loyalty due to this defeat, Rhadamanthys undergoes a loyalty test via Pharaoh's Balance of Curse, initially withdrawing but later accepting Pandora's request to oppose Alone. He kills the subordinate Specter Valentine to demonstrate loyalty and assumes guardianship of the sixth temple of Saturn. His final battle involves facing Regulus, Ilias' son, who sacrifices his soul to destroy Hades' divine heart, ultimately destroying Rhadamanthys alongside the temple. Rhadamanthys exhibits a strategic and cautious mindset, preferring overwhelming force to ensure victory. He displays impatience and violent tendencies when challenged or disobeyed. His loyalty to Hades remains absolute, though he occasionally questions Pandora's authority. He respects formidable opponents like Kanon and acknowledges threats pragmatically. In his final moments against Kanon, he demonstrates human vulnerability through intense fear. His interactions show concern for subordinates like Lune and frustration at interference from peers like Minos and Aiacos.