Formerly known as Jake, a battle-hardened and cynical veteran mercenary captain who died on the battlefield before reincarnating into the frail, neglected body of the third son of Grand Duke Sigmund. Possessing decades of tactical instincts, assassination methods, and cold pragmatism, Lucian immediately purges his body's structural flaws to navigate the murderous Valdeck succession war. He views power not as an aristocratic entitlement, but as an indispensable tool for absolute survival and autonomy. Powers: Master of the Lionheart Sword Style (notably the devastating Lion's Forepaw strike), advanced mana circulation, assassin-tier stealth, psychological warfare, and accelerated cellular recovery granted by the Nectar elixir.

The iron-willed Grand Duke of House Valdeck and the absolute apex of political and military power within the duchy. Sigmund views empathy as a fatal disease, openly pitting his sons against one another in lethal proxy wars to forge a ruthless heir. Initially writing Lucian off as a sickly failure, he recalibrates his strategy when Lucian displays monstrous martial acumen, treating him as a lethal game piece on his political board. Powers: Supreme-tier swordsman possessing overwhelming aura suppression, master strategist, and sovereign commander of the ducal legions.

Revered continent-wide as the legendary "Sword Saint," Eisen is a living monument of martial purity and the chief combat instructor of House Valdeck. Disillusioned by petty aristocratic squabbles, he agrees to instruct Lucian after witnessing the youth's anomalous mana precision. He later adopts the prodigy Felicia into the Britner name upon Lucian's recommendation, dedicating his twilight years to cultivating the next generation of absolute monsters. Powers: Pinnacle Sword Saint tier; absolute mana domain control, flawless execution of all Lionheart forms, and supreme sensory perception.

Known throughout the criminal underworld as the "Black Shark," Hugo was a ruthless kingpin managing illicit narcotics and gambling operations. After Lucian dismantles his network through sheer tactical dominance, Hugo experiences genuine terror and awe, swearing an unbreakable oath of personal fealty. He transitions from a crime boss into Lucian's most reliable shadow knight and household enforcer. Powers: Heavy broadsword mastery, brutal street-brawling combat style, underworld intelligence networking, and extreme physical resilience.

An unacknowledged, illegitimate daughter of House Valdeck who survived by cross-dressing as a male mercenary named Felix, earning the terrifying moniker of "Sword Demon." Trapped in an abusive syndicate in the Vestra region, she is defeated, liberated, and recruited by Lucian. Recognizing her natural combat brilliance, Lucian arranges her formal adoption under Sword Saint Eisen Breinter, turning her into one of his most lethal martial vanguards. Powers: Instinctive Sword Master tier; erratic high-speed dual-sword arts, hyper-reflexive footwork, and innate mana acceleration.

A seventeen-year-old orphan living in the squalor of the Tibron slums, Ian is a generational alchemical savant forced to work as a ghost-brewer for a fraudulent merchant. He is the sole individual capable of refining the legendary Nectar elixir. Lucian tracks him down in the capital, liberating him from exploitation and securing his absolute devotion as the chief alchemist of his rising faction. Powers: Master of micro-alchemical brewing, potion reverse-engineering, divine Nectar synthesis, and rare herb identification.

The arrogant and hot-headed fourth son of Grand Duke Sigmund. Deeply insecure about his standing in the succession hierarchy, he reacts with blind rage when Lucian rises to prominence. He challenges Lucian to a live-blade duel under the pretense of training, only to be psychologically dismantled, physically battered, and stripped of his heirloom sword. Powers: High-level knight-grade swordsmanship, aggressive offensive aura strikes, and ducal military training.

The calculating and haughty second son of House Valdeck. Jordi operates through political subversion, bribery, and estate embezzlement, using corrupt retainers to suppress his younger siblings while consolidating his claim to the duchy. He becomes Lucian's first political target within the household. Powers: Proficient swordsmanship, aristocratic political maneuvering, and mercenary command.

A rogue dark mage aligned with the Imperial Liberation Front operating in the Bornholm borderlands. Diggrec conducts horrific biological experiments, sacrificing entire battalions of human captives to trigger artificial demonic mutations in wild beasts and himself to overthrow the ducal borders. Powers: High-tier Dark Magic, forbidden chimeric transmutation, flesh-manipulation spells, and a monstrous mutated demonic combat form.