Yes, Nawaki had gained Asura's bloodline for only 1,000 Wish Power! This was the pinnacle of Yang Release, the power of the Sage of Six Paths' son, a symbol of a Sage's body and vitality!
What could 1,000 Wish Power get him? A kilogram of gold, or a kilogram of chakra testing paper?
Why could a mere 1,000 Wish Power be exchanged for a pinnacle bloodline like Asura's? Was a noble bloodline inherited from the Sage of Six Paths really worth only a kilogram of gold?
Although the Wish Power System was incredibly mysterious and could accomplish all kinds of unimaginable miracles, it came at a great cost, and its effects were nowhere near this exaggerated.
The reason Nawaki could gain Asura's bloodline for a mere 1,000 Wish Power was that he already carried the bloodlines of the Senju and Uzumaki clans. They were Asura's only two descendant clans, and they had always ensured the purity of their bloodlines through marriage within their own clans. So all it took was 1,000 Wish Power to fuse the two bloodlines and restore them to their original form.
To use a somewhat imperfect analogy, conjuring up tomato and egg stir-fry out of thin air would be difficult. But if you already had tomatoes and eggs, all you had to do was stir-fry them.
Nawaki had checked the system. If he wanted to use himself as a template to exchange Asura's bloodline for an ordinary person with no bloodline, it would cost 200 million Wish Power! The difference was more than a hundred thousand times. With his current reputation of just 10 points, he couldn't gather that much even in 50,000 years! A perfect bloodline from either the Senju or Uzumaki clan, meanwhile, cost 100 million Wish Power.
The Wish Power System divided Kekkei Genkai into four grades: low, medium, high, and perfect. They cost 10,000, 100,000, 1 million, and 100 million Wish Power, respectively.
Take the Sharingan, for example. If Nawaki acquired a bloodline template from the Uchiha Clan and exchanged for it himself, a low-grade bloodline would cost 10,000 Wish Power and allow him to awaken one Tomoe at most. The medium grade would cost 100,000 and awaken two Tomoe, and so on. Awakening the Mangekyo would cost 100 million, while the Eternal Mangekyo would cost 200 million!
Nawaki and Tsunade's grandfather had been the head of the Senju Clan, and their grandmother had been a princess of the Uzumaki Clan, so the bloodlines they inherited were both perfect. The bloodlines of other clan branches were much weaker. Their bloodlines couldn't fuse perfectly and instead restrained and conflicted with each other, affecting their talents. As a result, their bloodline abilities were only comparable to high- or medium-grade ones. That was why Nawaki only needed to spend 1,000 Wish Power to perfectly fuse the Senju and Uzumaki bloodlines. Otherwise, who knew how long he'd have to wait before he could exchange for Asura's bloodline?
It was clear that the Naruto world really was a place where birth and bloodline mattered. Without a bloodline, you were doomed to be cannon fodder for your entire life.
As Nawaki's older sister, Tsunade shared the same bloodline. If he wanted to, he could exchange for Asura's bloodline for her for only 1,000 Wish Power. But he didn't.
That was because altering a bloodline with Wish Power took time; it couldn't be done all at once. During the process, the person being altered couldn't stray too far from the system and ideally had to stay in physical contact with Nawaki. It would also cause strange phenomena, and the person would feel the changes in their body. If Nawaki exchanged for the bloodline for Tsunade, she would definitely discover the system's secret.
An incredible miracle performed by a one-year-old child couldn't be explained away as mere genius. People would see him as a freak or a monster. The unknown inspired fear, which could turn into loathing and rejection—just as the villagers called Naruto the Demon Fox because of the Nine-Tails' power.
Even if Tsunade might suppress her fear and confusion out of love for her younger brother and keep his secret, Nawaki wasn't willing to take the risk. Human nature couldn't stand up to tests. Only an idiot would test their own family.
There was another important reason: if Tsunade gained Asura's bloodline, her talent would let her rapidly grow stronger in a short time. As one of the Naruto world's main characters, she would trigger a chain of major changes! For instance, if Tsunade became far stronger than Jiraiya and Orochimaru, would the three of them still form a team? If they didn't, would the title of Sannin still come about? Would Jiraiya and Orochimaru's fates change?
After gaining Asura's powerful body and vitality, would Tsunade still devote herself to researching Medical Ninjutsu? Would Konoha's medical corps still be formed?
If Konoha discovered that Tsunade had an enormous amount of chakra and could suppress the Nine-Tails, would they make her the Nine-Tails Jinchuriki instead of Kushina Uzumaki?
If all these changes took place, the Naruto world's future would be drastically altered. Nawaki's greatest advantage as a transmigrator—the fact that he knew the story—would disappear, and the future would become unpredictable.
So Nawaki decided not to exchange for Asura's bloodline for Tsunade just yet. He would reconsider only after he turned twelve and safely survived the fated disaster of the Second Shinobi World War.
Although perfectly fusing the bloodlines of the two clans had caused Nawaki's bloodline to revert to its origins and granted him Asura's bloodline, along with a powerful body and chakra, he had no Tailed Beast inside him. So despite his great potential, he couldn't gain overwhelming power overnight.
In the original story, Asura was weak in the beginning. Only after long years of training did he gain enough strength to barely stand against Indra. It wasn't until the Sage of Six Paths extracted the Ten-Tails from himself, turned it into the Nine Tailed Beasts, and sealed the Nine-Tails inside Asura that Asura could truly fight Indra, who possessed the Eternal Mangekyo, on equal terms. In the end, they killed each other.
In later generations, Naruto Uzumaki—the child of prophecy and the Nine-Tails Jinchuriki who inherited Asura's Chakra—was also not very strong at first. He only reached Kage Level after learning the Rasenshuriken and using the Nine-Tails' chakra to move at speeds that rivaled the Flying Thunder God's instantaneous teleportation. Later, he seemed to gain power as if he had cheated: with help from the Sage of Six Paths, plus Senjutsu Chakra and the Nine-Tails' chakra, he surpassed Kage Level and reached Six Paths-level. Finally, together with Uchiha Sasuke, who possessed Indra's Chakra and had also received the Sage of Six Paths' power, awakening the Six-Tomoe Rinnegan and reaching Six Paths-level, he defeated Kaguya Otsutsuki.
Although Naruto eventually reached his peak and matched Sasuke's strength, or even surpassed it slightly, Sasuke had always kept him in check until then.
And why had two sworn enemies who possessed Asura's and Indra's Chakra alike—Hashirama Senju and Uchiha Madara—remained evenly matched from beginning to end, only to kill each other in the end? Because Hashirama Senju possessed the Wood Release Kekkei Genkai!
So Asura's bloodline was weak early on but explosive later, while the Sharingan was powerful from beginning to end. To ensure an advantage in combat early on, Nawaki had to acquire the Wood Release Kekkei Genkai.
But to prepare for the disaster awaiting him at twelve, Nawaki needed to grow stronger quickly. He had no time to train and build up his strength over the long term. His best path to rapid power was to acquire his grandfather's template and then exchange for the Wood Release Kekkei Genkai.
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