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Time flowed through the shifting dunes of Sunagakure, and Sayo's existence settled into the disciplined rhythm of an ascetic monk. By day, he was Elder Chiyo's most dedicated disciple, an analytical sponge soaking up the profound legacies of the Sand. By night, he was the silent architect, refining the Ōgumo and his broader mechanical dreams. Yet, the most critical anchor of his routine remained the nightly immersion within the Body Tempering Furnace.
The results of this consistent baptism were transformative. Sayo's frame had long since shed its porcelain frailty. While he lacked the hulking mass of a frontline bruiser, his body was now a machine of lean, high-tensile muscle and supple resilience. His skin had taken on a healthy, sun-kissed bronze, and every movement was imbued with a vitality that felt alien to the boy who had spent nine years plagued by systemic weakness.
However, the most profound evolution was occurring within his tenketsu.
That evening, Sayo emerged from the furnace, the residual energy shimmering around him like a faint heat haze. His mind and body were in a state of perfect, harmonic alignment. He assumed the Five Hearts Facing Heaven posture, his breathing slowing as he began his nightly chakra refinement.
The process had become algorithmic. His spiritual energy, sharpened by his engineering background, acted like a surgical probe, guiding the vigorous physical energy within his cells. Usually, the fusion was a steady, reliable stream.
Tonight, the river broke its banks.
Sayo felt as if a structural bottleneck within his meridian system had finally shattered. The source of his energy—once a modest spring—had widened into an expansive reservoir. As the physical and spiritual energies merged, the resulting chakra didn't just flow; it surged. It was no longer a stream, but a turbulent, high-pressure current roaring through his widened pathways.
The sheer volume of energy was staggering—a geometric leap from his previous genin-level reserves. Sayo's eyes snapped open, a brilliant, focused light reflecting in his pupils. He extended his hand, and with a mere thought, a dense, visible sheath of pale blue chakra erupted over his palm, flickering with the intensity of a stable plasma torch.
"This is it..." Sayo whispered, his voice thick with a rare tremor of excitement. "Chūnin-level reserves."
The deficiency that had served as his greatest tactical handicap was gone. He finally possessed the "fuel" necessary to sustain high-output machinery and complex jutsu formulae. He was no longer a glass cannon; he was a functional shinobi.
True to his nature, Sayo did not allow the exhilaration to cloud his judgment. Capacity was merely a variable; efficiency was the goal. In the brief windows between Chiyo's lectures, he aggressively tested his new limits with Wind and Earth Release.
In Earth Release, his progression moved beyond simple utility. The Earth Dome Return now manifested with tectonic speed and reinforced density. He even began experimenting with Earth Release: Earth Mausoleum Dumplings, attempting to condense and manipulate heavy soil into kinetic projectiles. While he couldn't yet launch massive boulders, his ability to reshape the battlefield was becoming a reality.
His Wind Release, too, reached a new tier of lethality. The Fierce Wind Palm was now a tool of surgical precision, used to adjust his positioning or deflect projectiles with devastating concussive force. He began mastering Wind Release: Great Breakthrough; while the scale was still developing, the sheer wind pressure he generated was condensed and orderly, a testament to his superior chakra control.
This quantitative leap finally provided the foundation for the ultimate project: his family's legacy.
He retrieved the Elementary Magnet Release Research Documents—the clandestine records originating from the Second Kazekage—from their hidden compartment. Previously, these scrolls were a theoretical curiosity; now, they were a technical manual.
With Chūnin-level chakra as his power source and his refined elemental affinity as the interface, Sayo began the arduous process of "Nature Fusion." He cleared his workbench, laying out fresh blueprints alongside thick stacks of calculation paper. His goal was to simulate the fusion of the "frequency and penetration" of Wind Release with the "structural stability" of Earth Release.
The process was inherently volatile. A single micro-error in the energy ratio would result in an immediate feedback loop, potentially neutralizing his chakra or causing a localized explosion. Yet, his engineering mind thrived here. He treated the fusion like a chemical reaction, adjusting the variables with microscopic precision.
Countless failures littered the floor in the form of charred paper and spent chakra.
Then, during a high-frequency vibration test, it happened. He integrated a sliver of vibrating Wind chakra into a highly condensed mass of Earth chakra at a specific, calculated ratio.
The mass didn't dissipate. Instead, it emitted a strange, low-frequency hum. A localized gravitational fluctuation rippled through the air. On the workbench, tiny metallic shavings began to dance, slowly drawn toward the glowing chakra mass until they adhered to its surface.
It lasted only a second before the energy collapsed, but the implication was tectonic.
Magnetism.
It was the smallest of breakthroughs—a proof of concept—but for Sayo, it was the "zero to one" moment. The door to the Jiton (Magnet Release) Kekkei Genkai had been forced open.
The road to mastering the Iron Sand was long, but as Sayo looked at the metallic dust clinging to his fingertips, a fierce fire ignited in his eyes. With his mechanical genius and a bloodline finally awakening, the future of the Sand was about to be rewritten in steel.
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