Leon's system, "Eternal's Grace," binds, instantly revealing his "Heaven-Devouring Physique" after the first curse is broken. He's still a "Cultivation Rank: None" at this point, but the physique allows him to instantly refine cultivation resources. The mysterious man reappears, explaining that the centipede's glowing crystal sphere is a "monster core," a cultivation resource. Leon, desperate for money to help his family, initially wants to sell it, but the man urges him to devour it to gain strength, hinting at a different kind of cultivation than Earth's magic system. With fear and a desperate hope for his mother's recovery, Leon swallows the core. A storm of energy erupts, rapidly advancing him through five levels of the Body Refinement Stage, a shocking, insane burst of power that transforms his body and mind. His next mission: eliminate a pack leader in a gate, promising another curse eradication key. Leon, now an F-class equivalent, enters the gate. He faces goblins, initially struggling and taking heavy blows, nearly dying. But his will hardens, remembering his sister's bullying, and he brutally slaughters the goblins with a stolen club, a satisfied, almost lustful smile on his face. He devours their cores, rapidly gaining Qi, and pushes deeper into the gate's layers, driven by a newfound hunger for strength. This rapid, almost effortless power gain, fueled by monster cores and his unique physique, sets him on an unstoppable path, but the true test of his resolve, and the next power-up, lies in the boss of the gate.

Leon confronts the D-class orc boss, a hulking, terrifying monster that easily shatters his newly acquired short sword and sends him flying, nearly killing him. This is a brutal reality check; his F-class strength is utterly insufficient. As the orc prepares to deliver a finishing blow, a searing memory flashes through Leon's mind: a pregnant woman, his mother, being brutally bisected by a much larger orc, screaming "Logaaaaaaaaaaaaaaaaan." This traumatic vision ignites an explosive, uncontrollable rage within Leon, unlocking his "Berserk Mode," which multiplies his abilities by twenty. With this sudden, overwhelming power, Leon delivers a devastating uppercut that sends the orc flying, then seizes its cleaver and brutally carves it in half, completing the mission. The system rewards him with a second Heaven Grade Curse Eradicator Key, which unlocks his "Abyssal Adaptation" bloodline, granting him the ability to develop elemental resistances and immunities. This brutal victory, fueled by a deep-seated trauma, reveals a terrifying wellspring of power within Leon, but also highlights the fragile, temporary nature of his berserk state and the immense power gap he still faces, leaving him craving more strength.

After exiting his personal gate, Leon is abruptly pulled into a "Hidden Realm" along with a group of hunters (Alex, Meridith, Willow, Noah) during a gate outbreak on Earth. This new dimension, the "Frozen Tear Territory," has a critical, life-threatening rule: all magic is suppressed. To the horror of the other hunters, their awakened abilities are useless, leaving them vulnerable to the extreme cold and the monsters within. Leon, however, discovers his system abilities, including his weapon summoning and cultivation, are unaffected. This immediately sets him apart, making him both a savior and a source of suspicion. They encounter a D-class Tyrant Ice Bear, which easily dispatches the other hunters. Leon, now E-class, is forced to fight it alone, struggling but eventually prevailing. A horde of fifty more ice bears appears, forcing them to flee. They are rescued by Emily and Sol Flemming, two S-class and B-class hunters from Earth's top guilds, also trapped. Emily and Sol reveal the realm's dark truth: a death tournament orchestrated by a mysterious figure named Harold, where humans are forced to fight each other, and "Primals"—shapeshifting monsters—are hidden among them. This revelation immediately puts Leon, who can still use "magic," under intense scrutiny and suspicion from Emily, creating a dangerous dynamic where his unique advantage could also be his doom.

Back in the cave hideout, Leon learns he can cultivate spiritual energy directly from the environment using breathing techniques. He purchases the "Mystic Monarch Ascension" technique from the system, but to his frustration, he must comprehend it himself. After 71 attempts, it clicks, unlocking his status bar and revealing his Heaven-Devouring Physique multiplies cultivation speed by three. He rapidly gains Qi, solidifying his E-class damage output. Emily, observing his "magic" (system use), grows increasingly suspicious, believing him to be a "Primal" or Harold's spy, leading to a tense confrontation where she tests his blood and questions his origins. Leon cleverly deflects, claiming his weapon summoning is his only ability. Emily and Sol eventually accept his story, at least temporarily, setting the stage for uneasy cooperation. Meanwhile, back on Earth, Leon's sister Jenny files a missing person's report, and Jasper Hudesman (Noah's brother, an S-class) frantically searches for his missing guild members. Leon returns to college, his physical transformation shocking everyone. He publicly displays his newfound strength by effortlessly dispatching a monster that attacks a restaurant, immediately drawing the attention of authorities and the public. This public display, while saving lives, shatters his anonymity and thrusts him into the spotlight, making him a visible, powerful figure in a world desperate for heroes.