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The success of the Preliminary-tier Natural Energy Puppet Core acted as a tectonic shift in Sayo's development. Without hesitation, he turned his focus toward his most vital piece of equipment: the Body Tempering Furnace. This device had already rescued him from his congenital frailty, but with the introduction of Divine Tree energy, it was about to become something far more profound.
The upgrade was a masterclass in high-stakes engineering. Sayo had to integrate the volatile Natural Energy core into the furnace's energy conduction network, reinforcing the internal Sealing Barriers to ensure the energy permeated his body uniformly rather than causing localized cellular collapse.
After several sleepless nights of meticulous debugging, Sayo lay down inside the chamber. As the hatch hissed shut, he activated the system.
"Buzz—"
The resonance was deeper than ever. The light paths on the furnace walls transitioned from the flickering blue of standard chakra to a steady, radiant milky white. Sayo felt a warm tide penetrate his very marrow. This wasn't just repair; it was evolution.
Every cell greedily absorbed the life-giving nectar. His meridians widened, bone density surged, and muscle fibers reorganized into a more optimized, high-tensile configuration. The final remnants of his premature birth—the lingering "shadows" in his physiology—were erased. He could feel his life form ascending.
Simultaneously, the spiritual energy of his two lives fused more tightly with his physical form. The result was a sudden, violent expansion of his reserves.
"Boom!"
A flood of chakra, purer and more agile than any he had ever felt, surged through his tenketsu. The bottleneck shattered. Sayo had officially reached Jōnin-level chakra volume. When he stepped out of the furnace, he felt light yet incredibly dense. A casual clench of his fist produced a sharp sonic boom.
"It succeeded... the Preliminary-tier Natural Energy Body Tempering Furnace is online."
With his physical foundation perfected and his energy problem solved, Sayo turned to the ultimate goal: The Mirage.
With Jōnin-level reserves, his mental processing speed reached a new peak. On his workbench, the massive design scroll for the Mirage was spread open. He began mapping out the energy transmission network:
Anti-gravity suspension arrays based on Magnet Release principles.
Vector propulsion modules for high-speed maneuvering.
Weapon system power supply for concentrated Iron Sand prisms.
Defense barrier generation units using magnetic flux.
Combining his knowledge of aerodynamics from his past life with the Sealing Formulas of the Ninja World, he optimized the hull. The final design was a streamlined, shuttle-shaped platform—a futuristic, flat-profile craft with no legs, relying entirely on a precise magnetic control system.
As he drew the final stroke connecting the weapon interface to the core, Sayo exhaled a long, satisfied sigh. The preliminary design for the Mirage was complete. It was a strategic, manned platform that surpassed all current puppet concepts, integrating the wisdom of two worlds.
The Gundam of his dreams was still a distant goal, but this Mirage, capable of soaring above the desert at near-supersonic speeds, had given him his first true pair of wings.
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