Lune di Balrog serves as a Specter under Hades, holding the title of Celestial Hero Star. His primary duty involves acting as an interim judge in the First Prison of the Underworld, overseeing the Tribunal of the Dead in place of Minos. This role requires him to assess the sins of deceased souls and determine their appropriate placement within the Underworld, utilizing a comprehensive book documenting all human transgressions. His authority mandates absolute silence within the Tribunal, a rule he enforces strictly, demonstrated by his execution of Marchino for disruptive behavior. Physically, Lune possesses medium stature, pale skin, long white hair, and violet eyes. He typically maintains a composed and serious demeanor, wearing a black robe adorned with red and gold accents over his Balrog Surplice armor. His primary weapon is a whip, often called the Fire Whip, which channels violet cosmic energy for combat and immobilizing opponents. In personality, Lune presents as polite, emotionless, and dedicated to his duties. He executes judgments without hesitation, attacking intruders like Seiya and Shun. However, he exhibits significant distress when believing he inadvertently damaged Hades' host body, revealing a vulnerability tied to his loyalty and fear of failing superiors. This emotional instability contrasts with his usual calmness and contributes to critical lapses during battles. Within the main Hades Chapter narrative, Lune confronts Seiya and Shun in the First Prison. Failing to locate their names in his book of sins, he attacks using his Reincarnation technique, forcing Seiya to relive his transgressions before banishing him to the Sixth Prison. He later traps Shun with his Fire Whip, creating an illusion of Shun's dismemberment that inadvertently mimics Hades' form. This illusion, crafted by Gemini Kanon, provokes panic in Lune until Rhadamanthys intervenes. Enraged by the deception, Lune attempts to strike Kanon but is swiftly disintegrated by the Gold Saint's superior power. In the spin-off *The Lost Canvas*, Lune's background expands. Years before the Holy War, he visited Jamir to recruit the young Shion, recognizing their shared ability to perceive object histories. He offered Shion access to all human knowledge, but Shion hesitated upon encountering memories within the Altar Cloth. Deeming hesitation a grave sin, Lune attacked Shion, leaving him severely injured before departing. During the Holy War, Lune guarded the Temple of Venus within the Lost Canvas, overseeing the recording of human histories destined for salvation. He intercepted Athena's group, immobilizing them with his whip until Shion intervened. Their subsequent battle involved Lune using Reincarnation to expose Shion's sins and attempting to banish him to Cocytus. Shion ultimately defeated Lune using Hakurei's Praesepe Returning Spirits Wave technique, which exploited Lune's inability to predict unfamiliar attacks. Lune's combat abilities center on two techniques: the Fire Whip, extending via cosmic energy to slice or constrict targets, and Reincarnation, a psychic assault paralyzing victims by forcing them to relive their sins before dispatching their souls to designated Underworld realms. His power level exceeds Bronze Saints, matches or surpasses Silver Saints, with some assessments placing him near Gold Saint tier. The character's conceptualization draws from J.R.R. Tolkien's Balrogs, evident in his Surplice design and whip-based combat style.