Jacob returns to the surface after five days of intense, isolated training in the deep, during which he drastically improves his physical attributes and basic skills by correcting their internal flaws. Upon his return, the arrogant foreman Luthor and the brutish senior miner Clayton attempt to humiliate and destroy him. Clayton assigns him to an unstable, collapsing tunnel with a fractured pickaxe, fully expecting the roof to cave in and bury the boy. Instead, using the Grimoire's structural analysis, Jacob reinforces the wooden support with scrap materials and reinforces the broken tool with a simple hose clamp. He effortlessly extracts a massive, high-grade block of silver by targeting the stone's natural weak points with precise, low-force swings. When Clayton tries to show off and mimic his success, the faulty pickaxe shatters in his hands, humiliating the bully in front of the entire crew. This spectacular reversal escalates when the cold-hearted Foreman Luthor tries to frame him as a cheat. Luthor forces Jacob into a public sorting challenge, presenting a messy cart of mixed ore. Jacob uses the Grimoire to analyze the metal purity and mana saturation of each lump, sorting them into ten highly precise piles, identifying rare mana-infused silver that the senior engineers completely missed. Furious at losing face and failing to fire the boy, Luthor and Clayton hatch a deadly new plot. They announce a high-stakes mining contest with a coveted Silver-grade Mana Pool Skill Crystal as the prize, deliberately pairing Jacob with the oldest, most fragile miners in the pit and assigning them the most dangerous, barren shaft. Luthor eagerly awaits the collapse that will bury Jacob forever, unaware that the young miner has already begun tutoring his elderly crew to absolute mastery. As the final day of the contest arrives, Jacob's team emerges with a staggering, record-breaking haul of over two thousand kilograms of silver, completely crushing the foreman's trusted crew. But just as Jacob claims the prize, his mentor Orvick collapses, leaving him to face a deadly ambush in the dark.

Following the heartbreaking death of the respected elder Orvick, who leaves Jacob a legendary Gold-rank offensive skill called Hell's Sword, the corrupt Clayton and his thugs launch a lethal ambush inside the dead man's home. They seek to murder the young miner and steal his newly acquired Mana Pool crystal. Trapped in a five-on-one scenario, Jacob is forced to activate Hell's Sword for the first time. The blazing golden blade terrifies his attackers, but the massive mana drain threatens to exhaust him before he can finish the fight. In a desperate bid for survival, Jacob absorbs the Silver Mana Pool crystal mid-combat, expanding his energy reserves. Guided by the Grimoire's hidden diagnostic lines, he unleashes the sword's remote-control levitation effect, sending the flaming blade flying through the air to effortlessly execute the thugs. After executing Clayton and laying Orvick to rest, Jacob flees the village to avoid the Guild's wrath, embarking on a grueling six-week journey toward the port city of Clearbay. Lost in the treacherous, maze-like lagoons surrounding the city, he encounters the carriage of Felisia Clearwater, the youngest daughter of the city's Lord, and her platinum-ranked bodyguard, Sir Greyson. Desperate for a ride and a bath, Jacob boasts of his tutoring abilities. When the arrogant Felisia mocks him as a peasant beggar, Jacob uses the Grimoire to analyze Greyson's True Diamond-rank armor skill, instantly identifying its flaws. By instructing Greyson to reroute his mana, the veteran knight's skill level surges by eleven levels in seconds, leaving the noble party completely speechless. This incredible demonstration earns him a ride into Clearbay, where he is hired as Felisia's personal tutor to help her prepare for the upcoming Sky Hunt, a ruthless trial of succession against her hostile sisters. However, as they enter the city gates, Jacob is forced to prove his worth once more by identifying a structural crack in the city's main runic ward, cementing his reputation as a master of flaws while drawing the deadly attention of the city's elite.

Jacob's rapid rise draws the ire of the Clearwater elite, leading to a series of confrontations with arrogant rivals like Valerius Shellford. After humiliating Valerius at the Adventurers' Guild by exposing his prized Platinum artifact as a cracked fake, Jacob secures a solo permit for the Smoldering Glass Crucible, a highly dangerous, unswept Elite Dungeon. Despite warnings from Felisia and Sir Greyson, Jacob enters the fiery depths alone, determined to fast-track his leveling before the Sky Hunt. Inside, the Grimoire maps out the dungeon's complex trap arrays and monster weaknesses, allowing him to effortlessly deactivate lethal glassfire beams and harvest rare materials. He systematically hunts down empowered Glass Golems and hounds, utilizing his newly unlocked Platinum Class, Infernal Architect, which fuses his Hell's Sword and newly acquired support skills. The sheer density of the monsters forces Jacob to push his skills to their absolute limits, culminating in a grueling battle against a level seventy-five Shadow Mimic. The mimic perfectly mirrors Jacob's own combat style and skills, forcing him to rely on the Grimoire's real-time flaw detection to predict its moves and shatter its core. Upon defeating the mimic, the mysterious bracelet gifted by the ancient Infernal King Baalrek reacts, guiding Jacob to a hidden, ancient chamber. There, he faces Baalrek's trials, easily solving complex runic puzzles and earning a legendary Gold-rank movement skill, Infernal Wings of Ash. Returning to the main dungeon, Jacob carries out a massive haul of valuable loot and easily obliterates the level ninety golem boss in seconds, walking out of the portal as a certified powerhouse. However, his triumph is cut short as the vengeful Calantha Clearwater arrests him for the murder of Valerius, dragging him in chains before the High Council. Facing public execution, Jacob invokes his right to a trial by combat, setting the stage for a spectacular clash against Julius Shellford.

After easily executing Julius Shellford in the arena and being defended by the legendary Wandering Knight Sir Renquell, Jacob stands alongside Felisia as the highly anticipated Sky Hunt begins. Assigned to the barren, raptor-infested Grave-Isle, they face a grueling war of attrition designed to break their spirits. Jacob utilizes his newly acquired Dark Lattice skill to absorb the raptors' shadow cores, replenishing his mana and unlocking the devastating Diavolo Draw technique from his Infernal Manual. As they progress to the final island, they encounter a massive, level two-hundred Heavenly Snake Lord guarding the path to the throne. Jacob engages the beast head-on, allowing Felisia to sprint toward the summit. Under the guidance of King Baalrek and the Grimoire, Jacob fuses his Hell's Sword and Dark Blade to unleash the forbidden Black Flame, slicing the serpent in half. However, the battle leaves him near death, and he is immediately ambushed by Felisia's oldest sister, Adrienne. Despite his severe injuries, Jacob uses the Grimoire's predictive overlays to effortlessly dodge Adrienne's Platinum-rank ice attacks, eventually shattering her magic and forcing her to yield. He flies to the summit to find Felisia struggling against the arrogant Elf Veyl. As Felisia ascends the Heart Throne, a dangerous mana overload threatens to consume her life. Jacob steps in, using the Dark Lattice to absorb the excess energy, which triggers a permanent evolution in his own mana channels, unlocking the legendary Platinum-rank Infernal Veins. Sprouting demonic horns and massive ash wings, Jacob engages Veyl in a catastrophic final duel. He shatters Veyl's forbidden red lightning spear with a perfectly targeted strike, executing the Elf and securing Felisia's place as the rightful heir of Clearwater. With the city secured, Jacob prepares to depart for the prestigious Ytrial Academy, leaving behind a legacy of fire and shadow while stepping onto a much grander stage where the true powers of the world await his arrival.