Kin shifted his gaze away from the Scroll of Seals and raised his head. Rubbing his stiff neck, he felt a throbbing pain in his forehead as he pondered the method to elevate the Basic Internal Energy.
At its core, Basic Internal Energy served chakra, and its entry barrier wasn't particularly high. However, advancing it required an absurdly steep threshold. The difficulty of sealing remained largely unchanged, but the demand for innate ninja talent had increased significantly.
Two conditions were essential: attribute conversion and nature transformation. Attribute conversion wasn't difficult—most ninjutsu relied on it. Yet, nature transformation was a rare gift possessed by only a handful of ninjas. Kin counted himself fortunate to have this talent.
For now, he could only attribute this ability to innate talent until he uncovered its underlying principles. Techniques like Breathing Method and Steel-Cutting Flash were his creations, tied to nature transformation, while Spirit Bullet was purely attribute conversion. As for the Six Treasuries Immortal Thief, it was a product of his chakra research.
Returning to the development of internal energy, the key to elevating Basic Internal Energy lay in forming a hybrid of attributes and chakra within the body. Pure attribute conversion could harm the ninja, but blending it with chakra allowed for safe preservation within the seals.
To advance, the first step was to determine the attribute for chakra conversion. This was why Kin had hesitated to pursue this path. Once an attribute was fixed, the internal energy would grow stronger, but the power of ninjutsu from other attributes would diminish proportionally, leading to a narrow specialization in combat.
Aside from techniques unrelated to attributes, this limitation would significantly impact a ninja's versatility. Kin was born with an innate affinity for all attributes, and wasting such talent would be a shame.
Theoretically, developing a multi-attribute internal energy was possible. However, among those who had learned Kin's techniques, only Tsunade could contribute meaningfully to the research of Basic Internal Energy. She had even made improvements to it, though they fell short of a qualitative leap.
As for Orochimaru, he was content to wait for ready-made results. Burdened with his own projects, he had no time to delve deeply into the development of Basic Internal Energy. It was frustrating. Kin had hoped Orochimaru could provide theoretical foundations, but alas—relying on others was unreliable.
This meant the progress of Basic Internal Energy would have to advance step by step, slowly and steadily. There was no rushing it. Until a multi-attribute ninjutsu could be deduced, Kin would have to settle for a single attribute, leaving him torn.
However, the Scroll of Seals offered some inspiration. The development logic behind the techniques created by Tobirama Senju gave him plenty of ideas. Most of the techniques recorded there were rare in the five basic natures (wind, fire, lightning, earth, and water), with Yin and Yang attributes dominating instead.
Yin represented spiritual energy, capable of manifesting effects akin to materialization when combined with chakra. Yang represented physical energy, enhancing vitality and even animating inanimate objects. If Kin pursued a taijutsu path, Yang would be his obvious choice. But to fully utilize his innate talent, Yin was more suitable.
Yin's materialization potential could eventually allow for the conversion of other attributes. Initially, Kin hadn't deeply considered Yin due to the limited Yin-based techniques at his disposal, most of which were clan secrets with strict physique requirements. The Scroll of Seals, however, imposed no such restrictions, relying solely on one's talent and comprehension. This redirected Kin's focus back to Yin.
"Even with Yin, my combat power will take a temporary hit," he mused. Fixed attributes would inevitably weaken other techniques.
"But the Sharingan is a Kekkei Genkai of Yin, isn't it?"
Kin speculated that the Sharingan represented the pinnacle of Yin-based chakra, and its so-called "ocular power" might be an extreme manifestation of Yin. If his theory held, while some ninjutsu would lose potency, his Sharingan abilities would grow stronger. The trade-off would maintain his overall strength.
Still, this level of power wouldn't make waves in the current shinobi world.
"I can convert my attribute first and focus on development later, using the Sharingan to balance my combat capabilities for now."
With this in mind, he formulated a plan.
"Deduction: Yin-based chakra internal energy, designed to enhance the Sharingan's potential and unlock multi-attribute possibilities."
As he fed the required data into the Golden Finger system, the Deduction Input Interface sprang to life, its text rapidly shifting. Countless theories, techniques, and developmental concepts flashed across the screen, eventually coalescing into an immensely complex sealing technique.
Like the Basic Internal Energy, it was divided into three tiers. The good news was that it could be directly converted from the Basic Internal Energy. The bad news was its extreme difficulty—even with the Golden Finger's assistance, Uchiha Kin found it challenging to comprehend.
"The number of techniques involved here is… excessive."
One detail caught his attention. Rubbing his temples, Kin noticed several unusually advanced techniques flicker across the interface:
Izanagi, Izanami, Susanoo, Chibaku Tensei, and Mokuton: Wood Release.
Had Uchiha Madara's knowledge been leaked?!
But Madara's involvement was a minor concern for now. He was still hiding in the shadows, waiting until the Third Shinobi War to make his move. His true resurgence would come with his restored youth—something Kin's Basic Internal Energy couldn't replicate.
The real issue lay elsewhere.
Dust Release: Atomic Dismantling Jutsu! Lightning Release Chakra Mode!
What were these techniques doing here?! Konoha had no record of them! How had they appeared in his system after just a short absence?
This implied that hostile forces had acquired his techniques. Currently, Konoha was overpowering three villages with minimal losses, all thanks to the Basic Internal Energy. If other villages obtained this technique, the entire shinobi world's power level would escalate, putting Konoha at a severe disadvantage.
As the inventor, Kin wouldn't be directly implicated—too many people already knew the Basic Internal Energy. But as an Uchiha, he'd be an easy scapegoat for Hiruzen Sarutobi to exploit.
A giant "DANGER" sign seemed to flash above Kin's head. This wasn't a blame he could easily shake off.
Still, there was no need to panic. His current strength was enough to leave Konoha if necessary.
The more pressing issue was the sheer difficulty of deducing a Yin-based chakra internal energy, even with the collective knowledge of the entire shinobi world. How could he possibly proceed with further development?
"Unless… I enlist the entire shinobi world to research chakra internal energy for me."
With the collective efforts of all ninja, the knowledge generated could accelerate the refinement of his chakra internal energy.
...
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(End of Chapter)