Just earlier, long before the Overseer's boots began echoing down the dark tunnel, Xuan Xi had already been sitting in the shadows, analyzing the structural differences between his world's spells and this world's techniques.
Whether the locals called them fighting arts, arrays, or mystical arts, he systematically stripped away the terminology to reveal the naked physics beneath.
'Spells aren't fundamentally different from techniques,' he mused coldly, his analytical mind sorting through the general knowledge of his new body. 'An average fire-sword used by an elite Knight Mage back home utilizes an elemental property and an energy source—just like a flaming saber technique in this world. The core difference is purely in the efficiency of the output.'
He analyzed the situation deeply, weighing his theories against reality. Magic was capable of devastating, world-shaking destruction, but raw power alone didn't guarantee a win. In a world where mana was not saturated everywhere, a high-tier spell would instantly drain a caster dry, drawing an exponentially larger amount of energy than what a cultivator's standard Qi usage required.
'And that comes down to balance,' Xuan Xi realized, his academic instincts kicking in. 'For these cultivators, absolute fluid control is everything. That is why their traditions demand the Dantian be forged as a spinning sphere—it is frictionless, making it remarkably easy to shape, roll, and control. But a Sage Soul demands constant, active mental concentration to hold a spell matrix together. Under high energy usage, a sphere simply lets power leak out too easily.'
He looked down at his frail, stick-like forearms. 'With this pathetic, malnourished body, trying to convert a standard fighting spell into a physical technique would instantly shatter my own meridians. My pathways are far too narrow. Even a basic fireball—which is a standard spell back home and would be considered a mystical art here—would generate a thermal backlash that would cook my lungs from the inside out. I am far from capable.'
But a smile pulled at the corner of his lips. If he couldn't use his body as a weapon, he would use his body as a canvas.
'I don't need raw muscle power. What I understand better than anyone in this realm is the math of an Array. I don't need to project energy outward; I just need to make my internal Qi react mathematically to what is about to happen to my physical body.'
Now, standing in the middle of the open cavern with the Overseer clutching his bleeding, ruined groin, Xuan Xi knew his hypothesis was about to be proven. The giant was stumbling, his center of gravity completely destroyed. The groin was the vital nexus a warrior used to shift their weight during a strike. Without it, the man's physical balance was completely severed.
'I have the ultimate advantage,' Xuan Xi's eyes narrowed into twin slits of razor-sharp light. 'He is heavily wounded, completely unhinged, and about to throw every drop of his remaining strength into a single, sloppy attack. I will deploy a quick Array Technique, inspired by a defensive spell from my previous life.'
Around the perimeter of the cavern, the watching crowd of miners was utterly frozen. Their hollow, dead eyes were wide with a mixture of absolute shock and primal terror. They had never, in all their years of torment, expected a frail kid like Xuan Xi to actually fight back, let alone draw blood from a tyrant.
Yet, as the Overseer slowly straightened his towering frame, a cold wave of hopelessness washed over the slaves. They knew the absolute, unyielding hierarchy of the Iron Blade Sect. Their fates were fixed in stone; a slave was nothing but free labor meant to be worked until they turned to dust. A temporary fluke wouldn't change the laws of cultivation.
Xuan Xi's calculative eyes calmly fell onto the Overseer, completely ignoring the despairing whispers of the crowd.
"It is over," a miner muttered from the dark, turning his head away. "The boy is dead."
The Overseer wasn't joking around anymore. His face was a contorted, purple mask of pure, unadulterated rage and humiliation. Red, pulsing veins bulged along his neck as he gathered every single drop of his remaining Level Three Qi, forcing the energy through his meridians with reckless, self-destructive force. The grey light of his Iron Skin Qi surged, turning a dark, menacing metallic ash color around his fists.
"You really pissed me off! What the fuck is wrong with you! Why the hell are you fighting back?!" the Overseer groaned, a beastly, animalistic roar tearing from his throat as he lunged forward, swinging his fist in a wide, desperate trajectory meant to erase Xuan Xi from existence.
Xuan Xi exhaled a quiet, disappointed sigh. He didn't panic. He didn't even flinch. His mind focused entirely on the microscopic twitch of the man's tensed shoulder, measuring the precise angle of the incoming fist.
With a single, perfectly calculated step backward, his mind triggered the internal trigger.
'Just as I realized earlier, I cannot overpower him with muscle,' Xuan Xi's thoughts ran with beautiful, crystalline speed. 'But why should I waste my own energy when my opponent is offering me so much of his? The perfect spell formula to convert into a defensive Qi array is... Rebound.'
Because Xuan Xi had systematically ruined the giant's balance with his initial strike, the Overseer had no choice but to throw the entirety of his kinetic weight forward to maintain the momentum of his punch. He was completely locked into his trajectory, unable to alter his course.
Deep within Xuan Xi's chest, the compressed, geometric Cube Dantian suddenly flared with a blinding, iridescent light. As his boot settled into the dirt, the internal matrix snapped into perfect alignment with his meridian pathways. The highly pressurized Qi pushed outward, bursting through his skin and constructing a completely invisible, mathematically flawless geometric wall right in front of his chest.
BOOM!
The fist struck the invisible array.
For a microsecond, time seemed to stop. The Overseer's grin of impending victory instantly shattered. The geometric wall didn't yield even a millimeter. Instead, the array completely absorbed the raw kinetic energy of the Level Three strike, multiplied it against the absolute structural rigidity of the cube, and violently redirected the entire impact back toward its source.
The Overseer's own massive strength, combined with his dense Iron Skin Qi, blasted directly back into his own tensed arm and chest like a returning cannonball.
CRACK! CRACK!
The sound of snapping bones echoed sharply through the quiet cave.
In a sudden, spectacular flash—without Xuan Xi ever throwing a single punch or casting a visible technique—the six-foot-tall Overseer was violently lifted off his feet. He was sent flying horizontally through the air like a broken ragdoll, soaring a full fifteen feet before smashing brutally into the jagged stone wall of the mining cave.
The impact caused a shower of loose dirt and pebbles to rain down. The Overseer slid down the rock face, collapsing into the dirt in a crumpled, unmoving heap. He hacked up a massive mouthful of dark, visceral blood, his iron-studded club rolling uselessly away from his limp fingers. He was completely broken, his cultivation cracked, and utterly incapable of fighting back.
Everyone in the cave went dead silent.
The rhythmic sound of mining had completely vanished. The only sound left was the ragged, wet breathing of the defeated giant. What had just happened was so incredibly fast, so entirely beyond the laws of their understanding, that the miners' brains completely short-circuited.
One by one, their jaws dropped to the floor. A scrawny, malnourished slave boy at Body Tempering Level Two had just completely dismantled a feared Level Three Cultivator using nothing but a step backward.
Xuan Xi calmly rolled his shoulders, his expression as serene as an academic stepping out of a lecture hall. He looked down at his glowing, cubic Dantian, a quiet, dangerous satisfaction settling deep within his soul.
'Method conversion successful,' he noted, his gaze landing on the unconscious tyrant. 'Someone said this before: For every action, there is an equal and opposite reaction.'