Cain

Biodata

Power Progression

Background

Cain transmigrated into the body of a three-year-old boy whose original owner had starved to death. Sword God Gal Farion found and took him in, raising him through punishing Sword God Style training that included forcing him to fight packs of monsters for food. 19 Cain initially remembered only the surname Reiback; Gal gave him his name. 190

At age twelve, Cain defeated a Sword Emperor and challenged Gal at the Sword God's Holy Land. Their exchange of Blade of Light made Cain the rightful Sword God, but he left as the apparent loser rather than take Gal's title and possessions. Gal later acknowledged that Cain had defeated him and that Cain's departure preserved his dignity. 1 53 56 252 When Cain set out, Gal gave him Instant Void, travel money, and a map, and entrusted him with his ambition to surpass the Dragon God. Cain became lost almost immediately. 2

Cain's poor sense of direction repeatedly leaves him unable to navigate without help. He treats it as a curse, while Orsted bluntly identifies it as an issue with his sense of direction. 24 91

Cain later learns that Alexander Kallman Reiback is both North God III and his ancestor, making him a descendant of Demon King Atofe. Although initially uncomfortable with the revelation, Cain acknowledges Atofe as his grandmother after defeating her. 117 194

Appearance

Cain is a youthful, handsome black-haired boy with brown eyes. During his early travels, he commonly wears a white travel robe, cloak, sword belt, and bracer while carrying two swords. 34 115

• His features grow more mature as he approaches fifteen; prolonged sun exposure darkens his complexion. Roxy initially fails to recognize him when they reunite after a further two-year separation. 152 222
• He carries the katana Demon Blade: Instant Void at his waist and often keeps a second sword on his back. 34 133
• When activated, his cyan-blue Magic Armor enlarges his silhouette to roughly 1.7 meters and alters his voice into a deeper, intimidating tone. 54 55
• Orsted's improvement changes the armor into a spiked golden form resembling the legendary Fighting God Armor. Under intense emotion, it can further darken to a dark-gold form with five floating magic spheres. After Cain masters it, the armor assumes a radiant holy white form and returns to a white gauntlet when dismissed. 170 171 191 225

Personality

Cain is straightforward, earnest, and intensely devoted to the people he considers important. He initially treats Roxy as his indispensable teacher and navigator, then becomes fiercely protective whenever she is threatened. 5 8 24 He values companions and respect for mentors more than prestige, as shown by his refusal to seize Gal's Holy Land after defeating him. 53

Despite his overwhelming strength, Cain often shows restraint: he used the flat of his blade against palace guards and spared Darius because killing him would have forced Cain to leave Roxy's country. 23 24 His restraint has limits; he kills enemies who directly endanger Roxy, Eris, or his companions. 24 58 96

Cain is ambitious about surpassing the gods, but he recognizes the limits of relying solely on the Sword God Style. Orsted and Auber push him toward broader methods, especially magic fusion swordsmanship. 32 95 124 He later identifies protecting his loved ones and friends—not merely surviving or becoming the strongest—as the purpose behind his pursuit of power. 225

Cain is an attentive, if initially awkward, mentor. He adapts his training to the emotional needs and practical limitations of Eris and Rudeus, deliberately holding back to protect his students' confidence while teaching them the skills needed to survive without him. 168 175 180 He also accepts Luke as a disciple after testing his courage to fight for Ariel despite overwhelming fear. 228

Following the Fittoa Displacement Incident, Cain becomes particularly vulnerable to fears of abandonment and loss. He treats Eris as irreplaceable family, grows more understanding of Rudeus's concealed anxiety for his own family, and prioritizes returning his companions safely to the Central Continent. 186 198 When Eris later chooses to leave for the Sword Sanctum to become stronger, Cain is saddened but supports her decision and promises to wait for her. 251

Abilities & Skills

Sword God Style

Cain is a Divine Rank Sword God Style practitioner whose speed, Battle Aura, and precision overwhelm Saint- and King-class swordsmen. 1 23 37

• Uses Blade of Light so frequently that observers mistake it for a basic attack. 6
• Can release long-range light slashes and cut through heavy armor, monsters, and defensive stances. 23 37 103
• Performs Fourfold Blade of Light, four near-simultaneous strikes capable of severing four armored targets. 103 117
• Can execute Ultimate Blade of Light with his bare hand, though doing so injures his hand due to his Battle Aura's poor defensive properties. 115 96
• Orsted can predict and evade Cain's consecutive Blade of Light strikes, demonstrating that the technique is not infallible against top-tier opponents. 87 95
• Can wield two swords and employ a Two-Sword Style Blade of Light, which he used while sparring against Paul and Auber. 145
• His speed and technique are acknowledged as superior even to the Water God Style's ultimate defenses by veteran observers such as Ruijerd. 186 187
• By their later wooden-sword spar, Cain can exchange blows with Orsted on nearly equal terms, although his Battle Aura still does not completely penetrate Orsted's Dragon Saint Battle Aura. 219 220

Blade-like Battle Aura

Cain's Sword God Style inheritance sharpens his Battle Aura into an edge capable of cutting through air, steel, and physical attacks. 77 148

• Enhances the speed and power of his strikes beyond conventional Sword God Style users. 77
• Can coat his body and weapons, allowing him to destroy an iron flail with his hand and behead a fleeing monster from range. 148
• Sacrifices defensive power for sharpness, leaving Cain vulnerable to self-injury when using swordless techniques. 77 96
• Cain teaches that Battle Aura is shaped by personal desire. His own offensive form can be projected from his body and molded around a weapon into an exceptionally sharp cutting edge. 175 176
• Even while unarmed, Cain can form Blades of Light from pure Battle Aura and defeat armored opponents at range. 193
• His Battle Aura eventually infuses his strikes passively, making even an attempted nonlethal blow with the flat of his sword capable of cutting a Gray Wolf in half. 210
• After awakening its complete form, Cain can merge his transparent, flowing Battle Aura with mana to produce his own long-range Blade of Light. His first demonstration severs a tree over one hundred meters away, though he says the technique still needs practice to become stable and proficient. 225

Magic and Chantless Casting

Cain learned magic under Roxy and possesses exceptional mana, spell control, and a low learning threshold. 7 49 His system originally granted him magical talent, chantless casting, and vast mana reserves despite his natural talent lying in swordsmanship. 2

• Uses Intermediate and Advanced Healing Magic, including chantless healing to repair severe injuries. 32 86 108
• Learned Advanced Detoxification Magic and can use defensive spells such as Water Barrier. 50 55
• Casts Emperor-class magic, including Purple Demon Flame Bullet and chantless Frost Nova. 29 113
• Can combine magic with swordsmanship, freezing or disabling targets before finishing them with a sword strike. 124
• His magic fusion approach involves a trade-off between casting, speed, focus, and maintaining his Blade of Light stance. 124
• Learned Saint-class Healing Magic, enabling him to restore lost limbs and treat injuries that exceed the scope of his Advanced Healing Magic. 170
• Specializes in Fire, Wind, Healing, Lightning, and Ice Magic, and can rapidly learn chantless spells developed by Rudeus. 180
• Collaborated with Rudeus to create an explosive composite spell that seals high-pressure Fire Magic inside an Earth Magic shell, producing a blast that scorches an area more than fifty meters wide. 180
• Can cast an enormous Absolute Zero spell, which he uses to freeze the sea and create a temporary route to an offshore island. 238

Regeneration

Cain's Undying Devil Race bloodline gives him rapid recovery, provided he has sufficient energy. 18 55 101

• Recovered from multiple fractures after fighting three S-rank Three-Headed Red Dragons. 18
• Combined his bloodline with chantless Advanced Healing Magic to heal a fractured forearm almost immediately. 86
• Can regenerate blood and used it to sustain Ghislaine while they were stranded in the wasteland. 101
• His regenerative bloodline does not naturally restore severed limbs, motivating him to learn Saint-class Healing Magic. 170

Demon Light Slash

Cain's personal ultimate technique combines immense Battle Aura and magic power through Magic Armor-coated Instant Void, which transforms into a greatsword. 73

• Used it to defeat the regenerating Nine-Headed Dragon that had cornered Roxy. 73
• Its output is high enough to devastate a mountainside during his battle with Orsted. 87
• Cain later demonstrates the technique while teaching Eris, using its immense destructive output to illustrate the limits and dangers of his Battle Aura. 176

Fighting God Armor

Orsted modified Cain's Magic Armor using research and blueprints connected to the legendary Fighting God Armor. The upgraded armor is a living, mana- and Battle Aura-consuming golden construct that substantially enhances Cain's physical capabilities, speed, defense, and magic. 170 171

• Normally provides roughly a fivefold enhancement and can reach tenfold output at full power. 170
• Possesses floating magic spheres that assist Cain's spellcasting; the normal form manifests two spheres, while the dark-gold state manifests five. 171 191
• Can attempt to summon a Dragonfolk Secret Treasure, an imitation God Blade that consumes half of Cain's mana and requires an intense emotional state to manifest. Cain later succeeds in wielding the blade. 170 171 225
• Amplifies Cain's emotions as well as his power. Rage can trigger a dark-gold rampage state that exceeds the armor's expected tenfold output. 171
• In its dark-gold state, Cain can generate dark-gold katanas and launch lightning through the five magic spheres. 191
• The armor allowed Cain to protect Eris and Rudeus from the Fittoa Displacement Incident and survive their fall onto the Demon Continent. 183
• Cain later discovers that Laplace's lingering memories and obsession with defeating the Human God contributed to the armor's dark, mind-eroding influence. After acknowledging that influence and resolving to oppose the Human God without surrendering his identity, Cain purges its final trace and gains full control of a holy white form that he estimates amplifies his strength roughly fifteenfold. 220 225

Equipment

• Demon Blade: Instant Void — Gal's exceptionally sharp katana, capable of cutting iron like mud; Cain's primary weapon. 19
• Refined-steel longsword — A second sword gifted by Roxy that Cain carries for its personal significance. He resumes carrying it while making his way back to her after the displacement incident. 133 219
• Magic Armor Gauntlet — A pale-blue bracer with a Red Dragon crystal that deploys full-body liquid-metal armor when fueled by Battle Aura and mana. 54
  • Triples Cain's physical abilities and enhances his magic by roughly two to three times. 54
  • Defends against Saint-class physical and magical attacks, but not King-class attacks. 55
  • Consumes Battle Aura and mana at approximately five times the normal rate, preventing extended use. 54
  • Orsted later merged the gauntlet with an improved Fighting God Armor core, transforming it into a golden, dragon-patterned armor system with substantially higher defensive and offensive performance. After Cain masters its holy white form, the dismissed armor resides in a white gauntlet. 170 171 225
• Dragon God's Bracelet — Identifies Cain as working for Orsted and serves as a deterrent against hostile nobles. It can also block the Human God's dream contact when placed on Rudeus. 139 245
• Summoning ring — A ring given by Orsted; Cain can inject mana into it to call him. It is no longer functioning after the displacement incident. 96 213
• Protective magic tools — Cain distributes Location Teleportation Rings and other protective items to his disciples, including Eris. When Eris leaves for the Sword Sanctum, he gives her a Locator Ring so she can summon him. 131 251
• Communication stone tablet — Allows written messages to appear on a linked tablet. Cain gives one to Alexander and Rudeus when they separate from his party and later uses a slate to contact Orsted. 220 241

Relationships

• Roxy Migurdia — Cain's magic teacher, adventuring partner, wife, and the person he most fiercely protects. He promised to marry her after fulfilling his dream, and their relationship later develops into marriage. After two years apart following the displacement incident, they reunite and reconcile at Magic University. 7 56 89 161 222
• Gal Farion — Cain's Sword God Style master. Cain defeated him for the Sword God title but continues to respect him deeply. Gal later publicly acknowledges Cain as the Sword Sanctum's rightful Sword God. 1 53 56 252
• Zoldat — Adventurer-party captain, friend, and Cain's swordsmanship student. Cain recognizes Zoldat as a Sword King. 26 77
• Orsted — Initially fought Cain as a suspected Human God apostle; later became his partner against the Human God and adviser on his growth. After their separation during the displacement incident, they reunite, spar, and discuss the dangers of Cain's armor and the possibility that Rudeus is an apostle. 86 94 95 219 220
• Eris Boreas Greyrat — Cain's swordsmanship and magic student. He protects and mentors her while setting boundaries around her affection for him; after the displacement incident, both regard the other as irreplaceable family, while Eris's attachment becomes increasingly romantic. They later acknowledge their love and become partners. Cain supports her decision to train at the Sword Sanctum and promises to wait for her return. 105 113 133 169 198 218 251
• Ghislaine Dedoldia — Companion whom Cain refused to abandon in the wasteland; later assists him in protecting and training Eris. Cain entrusts Eris's safety to her when they depart for the Sword Sanctum. 99 108 251
• Auber — Former North Emperor opponent whom Cain recruits as Philip's bodyguard and a teacher of Kiba North God Style. 120 122 124
• Rudeus Greyrat — Cain's magic student. Cain teaches him healing magic and Battle Aura fundamentals while encouraging responsibility in relationships; they later collaborate on combat magic and reconcile after Cain recognizes Rudeus's concealed worry for his family. Cain rescues him from bandits but subsequently confirms that he has been in contact with the Human God. Rather than condemn him immediately, Cain works with Orsted and Alexander to interrupt that contact and monitor him. 146 147 180 198 238 240 245
• Paul Greyrat — Cain confronts Paul over abandoning Ghislaine and Keith, then provides harsh swordsmanship guidance. They later reunite while Paul is helping rescue people displaced from Fittoa. 115 245
• Ruijerd Superdia — A Superd warrior who guides Cain, Eris, and Rudeus across the Demon Continent after the displacement incident. Cain initially mistrusts him but comes to respect his integrity and support his goal of restoring the Superd Tribe's reputation. Cain helps arrange public recognition for Ruijerd after he defeats the Scarlet Snake King. 183 186 187 205 207
• Alexander Kallman Reiback — North God III, Cain's ancestor, and initially a Human God apostle whom Cain decisively defeats. Alexander later becomes a companion and reveres Cain after learning of their familial connection. He assists Cain's party, gathers information, and helps monitor Rudeus. 117 194 196 213 220 245
• Atofe Raibaku — Demon King and Cain's ancestor through Alexander. Cain defeats her in battle before calling her “Grandma,” prompting Atofe to warmly accept him as family. 191 194
• Luke Notos Greyrat — Asks Cain to train him so he can protect Princess Ariel. Cain accepts him as a disciple after Luke demonstrates the courage to attack despite being terrified and knowing he cannot win. 228
• Nanahoshi — Orsted asks Cain to escort her to Magic University after they meet near West Port. She accompanies Cain's group toward the teleportation ruins. 219 220

Story Role & Major Arcs

Adventures with Roxy

After leaving the Sword God's Holy Land, Cain becomes Roxy's adventuring partner and student. Together, they complete commissions involving Heavy-Armored Mud Dragons and Three-Headed Red Dragons, while Cain learns magic and grows emotionally attached to her. 6 7 18

Cain joins Zoldat's Thunder Adventurer Group to protect Roxy from assassins. He clears an S-rank transfer labyrinth with the party, acquires Magic Armor, and becomes publicly recognized as the sixth of the Seven Great Powers. 26 38 54 56

Conflict with the Human God

Repeated assassination attempts on Roxy lead Cain to vow to kill the Human God. He rescues Roxy from a Nine-Headed Dragon, executes King Zerath for his involvement in the plot, and increasingly treats the Human God's apostles as a direct threat. 71 73 77

Cain's hostility toward the Human God continues to shape his decisions. He mistakes both Almanfi and Ruijerd for potential apostles during the Fittoa Displacement Incident, and his recognition of Alexander as a Human God affiliate triggers the Fighting God Armor's violent dark-gold state. 183 191

After Orsted raises suspicions about Rudeus, Cain discovers evidence that his former student is receiving the Human God's guidance. He chooses surveillance and an attempt to break that contact over immediately killing Rudeus; placing the Dragon God's Bracelet on him interrupts the dream visits. 220 240 241 245

Alliance with Orsted

Cain attacks Orsted after mistaking him for an enemy, but survives their battle and learns that they share a common enemy in the Human God. He helps test a helmet that suppresses Orsted's curse, accepts Orsted's guidance, and works as his ally. 86 89 93 94

Orsted later upgrades Cain's Magic Armor with research derived from the Fighting God Armor. The resulting golden armor becomes vital to Cain's survival and combat power during the displacement crisis and his journey through the Demon Continent. 170 183

The two reunite near West Port after years without contact. Orsted confirms that Ariel survived the reported assassination, gives Cain a map of linked teleportation circles to shorten his journey to Roxy, and asks him to escort Nanahoshi. Their subsequent spar demonstrates Cain's growth, while Orsted warns him about the armor's effect on his judgment and his suspicions concerning Rudeus. 219 220

Eris's Mentor and Protector

After becoming lost en route to the Asura Kingdom, Cain survives with Ghislaine and reaches the Fittoa Region. He becomes Eris's teacher, protects her from Human God apostles, defeats North God III Alexander, and recruits Auber after defeating him. 99 105 117 122

Cain later trains Eris in swordsmanship, Battle Aura, magic, and etiquette while also instructing Rudeus in magic. 133 147 150

Cain teaches Eris his blade-like Battle Aura and encourages her to develop the strength to protect herself and those important to her. Although he recognizes her growing attachment, he continues to treat her as his beloved disciple and family. 175 176 198

Their bond later becomes romantic. When Eris decides that she must train away from Cain to become strong enough to protect him, he stops her carriage long enough for them to explain their feelings, then lets her continue to the Sword Sanctum with Ghislaine. There, Gal acknowledges Cain's victory over him and accepts Eris for training. 218 251 252

Fittoa Displacement Incident and Demon Continent Journey

When a massive magic circle activates over the Fittoa Region, Cain attempts to protect Eris and Rudeus with the Fighting God Armor. Though he cannot stop the disaster, he shields them from the blast and awakens with them in the wasteland of the Demon Continent. 183

Cain travels with Eris, Rudeus, and Ruijerd while seeking a route home. He sweeps aside numerous high-ranking monsters, reassures the traumatized Eris, learns the truth of the Superd Tribe, and resolves to use his influence to help clear their name. 186 187

During the journey, Cain reunites with Alexander and encounters Demon King Atofe. The Fighting God Armor allows him to overwhelm both combatants, after which the revelation of his ancestry transforms Atofe from an opponent into an affectionate grandmother and Alexander into a loyal companion. 191 194 196

Cain puts his plan to improve the Superd Tribe's reputation into action by letting Ruijerd defeat a monster threatening a town's supply routes. With Cain and Alexander's backing, the city lord publicly awards Ruijerd a medal, although Cain subsequently learns that the lord is a Human God apostle. 205 207

Return and Reunion

After the party leaves the Demon Continent, Cain learns that Roxy is alive and searching for the displaced, while Ariel's political position and Sauros's safety remain uncertain. He resolves to return to the Central Continent, reunite with Roxy, and protect the people affected by the disaster. 213

Following his reunion with Orsted and the journey through the teleportation ruins, Cain finds Roxy. His changed appearance causes an initial misunderstanding, but they reconcile tearfully with Eris's help. Ariel later offers Cain and Roxy a villa near Magic University, which Cain purchases as a home for them and Eris. 219 220 222 228

Mastery of the Fighting God Armor

Concerned that the armor's dark state can overwhelm his reason, Cain trains to achieve a qualitative change in his Battle Aura. He awakens an aura that merges with mana, transforms the armor into its holy white form, and overcomes the lingering obsession of Laplace within it. He thereafter uses the armor and God Blade under his own control, including during the test through which Luke becomes his disciple. 220 225 228

Cain later crosses a frozen stretch of sea with Roxy to rescue Rudeus from bandits on an island. After confirming Rudeus's contact with the Human God, he coordinates with Orsted and Alexander rather than abandoning his former student. 238 240 241 245

Notable Quotes

“You scared my teacher! Trash!!!” 73

“My name is Cain Brand, not Monster...” 96

Trivia

• Cain cannot reliably navigate without a guide, map-reader, or companion; even a tracking bracelet fails to prevent him from getting lost. 34 96 150
• He continues to call his navigational problem the “Lost Curse,” even after companions repeatedly tease him for simply walking in the wrong direction. Eris cannot read a map either, though her sense of smell sometimes helps them find their way. 194 210
• He prefers simple, practical scents and finds Roxy's scent calming after battle. 18
• Cain is unusually insensitive to nonthreatening romantic attention, despite being highly alert to killing intent and danger. 49
• Despite his public standing as Sword God, Cain considers the title an empty convenience and believes disciplined training and real strength matter more than prestige. 173