The moment the thought struck him, Seimei paused his "Chakra Refining Technique" and began testing how fast his body could naturally recover chakra.
Not long ago, his "Constitution" attribute had jumped by two points, which resulted in a huge increase in the amount of chakra he could freely use every day. Now, his "Spirit" attribute had risen by three points. Even more, during this period it balanced out with his "Constitution" attribute, releasing some of the potential that had been suppressed by their previous imbalance. Needless to say, the boost was impressive.
Time ticked by. After about an hour, Seimei stopped his test. After doing some calculations, he concluded that this time the increase in his "Spirit" attribute had boosted his natural chakra recovery speed by 900,000 points. Frankly, that number was a bit lower than he'd expected. After all, as these basic attributes advance, the difficulty of increasing them grows—and the resulting boost should ideally be even greater. For example, when his "Constitution" went from 22 to 24, he gained an extra 500,000 points, so a jump in "Spirit" from 23 to 24 should have netted him at least a million points. Instead, he got 900,000.
After a bit of reflection, though, Seimei was at ease with the result. Based on past experience, boosts in "Spirit" have never enhanced natural chakra recovery as much as increases in "Constitution." Last time, when his "Spirit" rose from 22 to 23, it only added 150,000 points to his daily recovery, whereas the same increase in "Constitution" is estimated to have given him around 200,000 points. So even though raising his "Spirit" from 23 to 26 is theoretically more challenging, a daily increase of 900,000 freely available chakra was understandable. And honestly, 900,000 points is nothing to sneeze at.
When combined with the 506,000 extra points from his previous "Constitution" boost, his daily recoverable chakra had jumped to 1,406,000 points—more than the original 1,016,000 points he could restore. In other words, not counting the 1,000,000 points provided daily by his Seven-Tails, his free chakra had more than doubled. Just as he had predicted, this boost far surpassed all previous increases—it was by far the greatest he'd experienced since his journey began.
However, how to allocate this vast amount of chakra was a matter that required serious thought. Before that, he needed to confirm how the increase in his "Spirit" attribute affected his potential—that is, the change in his theoretical maximum chakra limit. Not long ago, a two-point boost in "Constitution" had increased his theoretical maximum by 800,000 points. Now, with his "Spirit" attribute starting from a higher base and rising even more dramatically, the boost should logically exceed 800,000 points.
With that in mind, Seimei closed his eyes and focused intently on the changes in his body. While doing so, he also activated the "Chakra Refining Technique" to extract some chakra, comparing the subtle changes before and after. Minute by minute, time passed until he finally concluded that his theoretical maximum had increased by roughly 1,000,000 points. This boost was still a little less than he'd anticipated, but considering that his previous "Constitution" boost had merged some Hashirama cells—potentially inflating its effect—the current increase seemed normal. Even so, after these two upgrades, his theoretical maximum had soared to a staggering 3,150,000 points. This completely erased any worries about depleting his potential. Instead, he now needed to figure out how to convert all that potential into actual power as quickly as possible.
Unfortunately, aside from running the "Chakra Refining Technique" and slowly mining his chakra, he had no other options. To speed things up, he would have to upgrade the level of his "Chakra Refining Technique." He recalled that when its level jumped from LV5 to LV6, the mining efficiency doubled—from gaining 32 points of maximum chakra per hour to 64. If he could double it again to 128 points, then over a 24‑hour period he'd net 3,072 points, which would add up to 92,160 points in a month. That kind of pace would be fantastic.
Alas, Seimei let out a soft sigh and glanced at the display board. At present, his "Chakra Refining Technique" was only at LV6 (3511/10000), and its proficiency could only improve with time—it couldn't be accelerated by pumping in more chakra. Based on continuous 24‑hour operation, it would take 270 days—that's nine months—to level up. Shaking his head in disappointment, Seimei decided not to hold out hope for that upgrade anytime soon.
Instead, he refocused his thoughts on how to allocate his chakra. With two attribute boosts, plus an additional 30,000 points saved each day after perfecting "Lightning Release: Thunderlight Body," he now had a total of 1,436,000 points waiting to be redistributed. There was no doubt that this was an enormous amount of chakra. To fully exploit its potential, he'd need to experiment and test various approaches. Most importantly, he had to determine his mental endurance limit first, so he could plan the chakra allocation accordingly. Even though his mental fortitude had been greatly enhanced along with the advancement of his Mangekyō Sharingan and "Spirit" attribute, whether he could completely absorb an extra 1,436,000 points was still an open question.
Breaking news: The latest scoop first broke in Book 69!
Realizing the need for testing, he looked up at the sky. The sun had just passed its zenith, meaning he had just enough time. With that decision made, Seimei wasted no time—he raised his hand, formed the necessary seals, and executed the "Multiple Shadow Clone Technique."
Boom!
A cloud of chakra smoke dispersed, and within moments, over a hundred shadow clones filled the area. Seimei glanced at them and, without any extra words, quickly divided them into groups and assigned each clone specific skills to train. Once everything was set, he dismissed the clones and began his own training.
This time, however, he chose not to use the "Heart Reflection Technique." At this stage, continuing with that method was simply too time-consuming. His previous tests had shown that merely using that technique might require dozens of attempts just to gain a single point of proficiency. Rather than wasting time, he decided to wait until he could improve its efficiency before using it again—so that the gains would be proportional to the effort. In the short term, he wouldn't need to allocate any training time to it.
The reason was simple: based on his earlier estimates, the prerequisite for improving the technique was to fully assimilate the Hashirama cells within his body. Only by combining the "Heart Reflection Technique" with those cells could he effectively stimulate his Sharingan to evolve toward the Rinnegan. Until the Hashirama cells were completely fused, he wasn't going to spend too much time on that—at most, he'd have his shadow clones handle some preliminary tasks.
Similarly, he wasn't planning to devote all his time to the "Palm Immortal Technique." With his "Constitution" attribute having increased to 24, even the enhanced "Palm Immortal Technique" was beginning to show diminishing returns in strengthening his body. Seimei estimated that if he relied solely on that technique—even if he dedicated all the time saved by not using the "Heart Reflection Technique"—it would still take more than six months for his body to reach the next critical point of transformation. Such a long time was simply unacceptable.
Therefore, he planned to split his time, dedicating half to practicing the "Lightning Release Chakra Mode." This approach would allow him to both level up that skill's proficiency and strengthen his body. Judging by the physiques of previous Raikage successors, "Lightning Release Chakra Mode" isn't just a combat ninjutsu—it's also a body-refining technique. In terms of training and results, it perfectly complements the "Palm Immortal Technique": one works from the inside out, the other from the outside in, with their effects perfectly balancing each other. Coupled with the guiding power of "Human Protection," this combination would undoubtedly produce results greater than the sum of its parts.
With all these thoughts racing through his mind, Seimei quickly gathered his focus and sprang into action.