Leon

Biodata

Feature	Value
Name	Leon Kasmod (莱昂)
Alias(es)	Empire's Strongest Dragon Slayer; Former Strongest Dragon Slayer; “The Man in the Black Armor” 2 335
Species/Race	Human 458
Gender	Male
Affiliation	Formerly the Empire's Dragon Slayer Army; Lionheart Society 2 409
Occupation/Role	Dragon Slayer; former squad captain; resistance leader 395 422
Status	Alive 502
First Appearance	Chapter 1

Power Progression

Stage / Realm / Level	Chapter	Notes
Dragon's Might enhancement	33	Refines and consumes Dragon's Might, then uses Lightning Magic on himself to break down its violent power; gains temporary dragon-like physical strength at the cost of hallucinations and impaired judgment. 31 33
Lightning body reinforcement	52	Adapts Lightning Magic into a bodily enhancement when his depleted reserves prevent high-intensity casting, sharply improving his muscles, bones, reflexes, speed, and close-quarters power. 52
Gate of Nine Hells — First Gate	223	Opens the first gate of the body technique, receiving a major power increase and a new skill; begins investigating the technique's possible Sea Dragon royal origin. 223
Gate of Nine Hells — Fifth Gate: Inertial Star	251	Unlocks explosive physical power beyond the Fourth Gate's Divine Speed; the technique's physical side effects become increasingly severe from this point. 251
Super S-rank Lightning Magic	276	Uses the defensive Sumeru's Shadow to survive the combined Dragon Flame of four Dragon Kings, then defeats them with his self-created Dragon Annihilation. 276
Gate of Nine Hells — Ninth Gate: Night Armor	429	Opens all nine gates and destroys the Primal Nightmare with Night Armor. The backlash nearly exceeds his limits and devastates the Upper City. 429 433
Super Sensation	476	Receives Claudia's body-technique manual, which is intended to improve reaction speed and sensory perception beyond normal limits. 476

Background / History

Leon grew up in an orphanage. At age five, he killed a vicious dog with his bare hands while saving a girl; a passing Dragon Slayer master, Tiger Lawrence, recognized his potential and accepted him as his sole disciple. At six, Tiger began teaching him the Invincible body technique. A failed stone-breaking stunt put Leon in the hospital for three years, but he recovered fully. 2

At ten, Leon entered the Imperial Dragon Slaying Academy. He graduated at the youngest age and with the highest evaluation in its history, ranking first in both written examinations and practical combat while receiving every top-tier scholarship available during his enrollment. 2 29

At fifteen, Leon joined the Dragon Slayer Army and became captain of an exceptionally successful squad. His victories and role in reclaiming territory made him a celebrated hero among the Empire's citizens, but his popularity and status also drew the royal family's attention. At the height of his fame, he was sent to the harsh Silver Dragon battlefield. 2

During the decisive assault on the Silver Dragon Sanctuary, a teammate used illusion magic and an enchanted weapon to betray Leon's squad. His allies retreated while Leon was left behind and captured by Losweiser, the Silver Dragon Queen. Believing he was about to die, Leon used the forbidden Charm Magic Blood Seduction against her, then unexpectedly survived and later awoke in the Silver Dragon Sanctuary. 1 2 177

Appearance

Leon is a tall man standing over six feet, with black pupils and an inverted-triangle physique: lean-looking in clothing but heavily muscled underneath. 39

• Wears the Black-Gold War Chariot, his distinctive enchanted Dragon Slayer armor, in battle. 26
• Bears a Dragon Mark on his chest, which initially drains his magical power. 5 133
• Often conceals his identity with disguises, sunglasses, or altered armor when entering human territory or moving among dragons. 181 335
• Is widely remembered by dragons as the “man in the black armor,” a figure associated with his peak dragon-slaying campaigns. 335

Personality

Leon is stubborn, competitive, and intensely prideful about his accomplishments. He refuses to surrender easily, whether he is escaping a sanctuary, enduring a spar, or being mocked for his captivity. His confidence can become boastful, especially when discussing his academic records, combat rankings, and former status as the Empire's strongest Dragon Slayer. 8 29 52 123

Despite his sharp tongue and frequent banter, Leon is protective by instinct. He shields soldiers who could have exposed him, enters the Silver Dragon Clan's war to defend Losweiser and their daughters, and repeatedly prioritizes his companions' safety over his own. He regards his family as motivation rather than weakness. 8 167 193 392

Leon was originally quiet and not particularly outgoing; his soldiers followed him because he repeatedly saved them in battle. Over time, he develops into a more empathetic public leader, listening directly to the Lionheart Society's grievances and earning its members' trust through patience rather than intimidation. 395 410

Abilities & Skills

Lightning Magic

Lightning is Leon's innate magical element and primary offensive specialty. His precise control made him stand out at the Dragon Slaying Academy, and his Lightning Magic remains effective for mobility, battlefield clearing, single-target damage, and physical reinforcement. 31 123

• Thousand Birds / Chidori — a high-speed Lightning attack used against the Crimson Flame Dragon Clan and Constantine. 166 317
• Lightning Sword Transformation — condenses lightning into a B-rank sword; can split its fragments into lightning needles after the blade is broken. 245 246
• Dragon Annihilation — Leon's self-created Super S-rank Lightning Magic, powerful enough to defeat four Dragon Kings. 276
• Sumeru's Shadow — Super S-rank defensive Lightning Magic that manifests as a skeletal frame, later reinforced with lightning armor. 276 427
• Limitation: The Dragon Mark secretly drained his magic power after his awakening, leaving him able to condense energy but initially unable to sustain large-scale spells. 123 133

Gate of Nine Hells

A demanding body technique given to Leon by Tiger Lawrence and later linked to the Sea Dragon race. Each opened gate improves his physical performance, but the technique places escalating strain on his body. 223 261

• First Gate greatly boosts his power and grants a new skill. 223
• Fifth Gate: Inertial Star grants exceptional physical strength and instantaneous explosive force. 251
• Ninth Gate: Night Armor allows a devastating physical attack capable of destroying the Primal Nightmare. 429
• Opening all nine gates risks lethal backlash; without Losweiser's transplanted Heart-protecting Dragon Scale, the Ninth Gate would likely have shattered his heart. 433 476

Dragon Slayer Combat Expertise

Leon combines battlefield experience, knowledge of dragon physiology, close-quarters combat, and tactical assessment.

• Exploits racial weak points, such as the Crimson Flame Dragon Clan's vulnerable knees. 71
• Can assess an opponent's general skill level after only a few exchanges. 71
• Uses lightning-enhanced movement to evade attacks and engage Dragon Kings at near-imperceptible speed. 167
• Remains capable of fighting effectively without magic when necessary. 71

Alchemy and Analysis

Leon successfully refined Dragon's Might from raw materials using a rudimentary setup and his Lightning Magic, demonstrating patience and practical alchemical skill. 31

He is also an effective investigator and interrogator. Leon methodically traced the betrayal within his former squad, exposed Victor as the mole, pressured former Dragon Slayer Army official Fouel/Voel for intelligence, and assembled evidence connecting the Empire to its Heart-protecting Dragon Scale program. 192 484 485 490

Equipment / Weapons / Items

• Black-Gold War Chariot — enchanted black-and-gold armor crafted by the Empire's finest artisans; possesses self-repair capability and protected Leon from fatal attacks during his Dragon Slayer career. Losweiser preserved it during his captivity. 26
• Heart-protecting Dragon Scale — transplanted by Losweiser; protects Leon from the Gate of Nine Hells' lethal backlash but prevents him from practicing Primal Magic. 433 476
• Pistol — used during his investigation into the squad member who betrayed him. 191
• Imprint Stone — used to preserve and publicly reveal evidence of the Empire's crimes. 395 424

Relationships

• Losweiser — Silver Dragon Queen, former captor, wife, and mother of Leon's children. Their relationship develops from hostility and mutual manipulation into a protective partnership built on trust and shared responsibility. 1 167 392
• Muen — Leon and Losweiser's daughter. Leon acts as her gentle, affectionate father and wants to teach her magic. 3 9 123
• Noa — Leon and Losweiser's daughter. Her early awakening of magical talent is a source of pride for Leon, and she repeatedly fights to protect her family. 122 251
• Aurora / Aurorla — Leon and Losweiser's daughter, named Aurora by her parents. In the future timeline, she helps explain reversal magic and leads preparations to send Leon back. 181 259 273
• Tiger Lawrence — Leon's master and foster father. Tiger raised him from childhood, trained him as a Dragon Slayer, and investigates the Empire's conspiracy alongside him. 2 185 395
• Rebecca Clement — former squadmate and loyal ally. She assists Leon's investigation, leads the Lionheart Society with her father, and frequently teases him. 181 359 409
• Martin — former squadmate and trusted ally who risks his life to obtain evidence against the Empire. 192 395
• Constantine — Crimson Flame Dragon King and former enemy. After repeated battles, he and Leon become situational allies bound by mutual respect and a shared opposition to the Empire's schemes. 392 472 502
• Claudia — Sea Dragon figure who provides Leon with manuals and guidance, including Super Sensation and access to Primal Magic resources for Constantine. 475 476

Story Role / Major Arcs

Capture and Life in the Silver Dragon Sanctuary

After his betrayal and capture, Leon attempts to escape the Silver Dragon Sanctuary but learns that Losweiser deliberately allowed his escape before taking him back. He gradually forms bonds with Muen and Losweiser while struggling with the humiliation of being unable to return to the Empire as the Dragon Slayer he once was. 5 6 8 16

Recovery of Strength and Defense of the Silver Dragons

Losweiser returns the Black-Gold War Chariot to Leon, enabling him to reclaim a major symbol of his former identity. As his Lightning Magic and physical condition recover, he fights beside the Silver Dragon Clan and confronts Constantine to protect his family. 26 52 166 167

Investigation of the Empire's Betrayal

Leon returns to the Empire under disguise to clear his name, reunites with Tiger and Rebecca, and discovers that Victor framed him on the Empire's orders. Victor's death confirms that the betrayal was part of a larger state conspiracy rather than an isolated act of treachery. 181 185 192

Future Timeline and Reversal Mission

After Lavi's space magic sends Leon twenty years into the future, he discovers a world shaped by his absence. With Aurorla, Noa, and Muen's help, he prepares reversal magic to return and save Losweiser and his family. 251 259 264 273

Overthrow of the Empire

Leon becomes a central leader of the Lionheart Society, helping unite victims of the Empire's corruption. He coordinates the Festival of a Thousand Lanterns operation, exposes the regime's crimes with Imprint Stones, summons Dragon King allies against the fusion beasts, and defeats the Knife Trio and Primal Nightmare. 409 422 424 429 430

Postwar Investigations

Following the Empire's regime change and the end of the Human-Dragon War, Leon continues pursuing the former King, Lord Shadow, and the remaining network behind the Heart-protecting Dragon Scale program. He trains sensory sorcerers, investigates dangerous species, and maintains alliances with figures such as Constantine. 463 485 486 490 502

Notable Quotes

“They are not a weakness—They are family.” 167

“When I was in the Empire's army, combat was about reclaiming land and defending our home and country. As for now... it's just about protecting the people and things I care about.” 392

“Fighting is awesome!” 463

Trivia

• Leon's first attempt at the Invincible body technique resulted in him being hospitalized for three years after a hammer strike meant to break a stone on his chest. 2
• He is an academic prodigy as well as a fighter, having graduated first in both written and practical examinations at the Dragon Slaying Academy. 29
• Leon's habit of calling his Lightning technique “Chidori” helped expose his human identity among the dragons. 458
• His former fame is so extensive that the Dragon Slaying Academy and his birthplace later become tourist attractions. 486