Black Hawk's voice was exceptionally loud, and the violent vibrations in his voice actually made Uchiha You feel the resonance effect of his chest and eardrums.

If it were an ordinary ninja or ninja cat, he would probably feel headache and chest tightness.

No wonder Maoyou was unwilling to come out to see Black Hawk, and even stopped Miwa Masayo from coming out. It seems that this big cat has suffered a loss.

Black Hawk did not notice Uchiha You's thoughtful expression. He explained to himself, "The ancient monkey Gangu from Mount Kongo dared to contact you secretly without telling me. I had no choice but to come to you regardless of anything else."

Only then did Uchiha You realize that the name of the white-bearded old ape corresponded to the name in the Kongoyama scroll.

He asked, "Black Hawk, you said the ancient ape just kept it a secret from you, but how did you know it came to find me?"

Black Hawk half complained, half proudly said: "This is not the first time that old monkey has done something like this without telling me. I have suffered many losses, so I sent my subordinates, Ninja Eagles, to keep an eye on Kongo Mountain. Their every move is under my watch."

Uchiha You understood that this was because the Ninja Hawk saw the old monkey Gangu leaving Kongo Mountain, and the Black Hawk got the information and followed him all the way.

After knowing Ganggu's purpose, Black Hawk decided to meet Uchiha Yu on the spur of the moment.

[It should be a greeting...]

Uchiha You looked into Black Hawk's eyes, convinced of the arrogance, purity, and clear stupidity revealed in his eyes, and nodded.

[It should be a greeting, but Black Hawk is too aloof and arrogant. He doesn't know what politeness is and doesn't know any honorifics.]

[This is normal. It is normal for an eagle to behave like this, given its pride in soaring into the sky.]

To be honest, Uchiha You had a very good first impression of Black Hawk, and liked him much more than the old ape with white beard.

Because of the clear stupidity in its eyes, Uchiha You missed the college students he had met before, who were just as proud and aloof, and just as outspoken.

But such guys will be the best partners, companions who can fight bravely with you, and may even become your comrades.

Uchiha You nodded and asked, "I understand, Black Hawk, you want to see me, do you want to get something from me?"

Black Hawk nodded and said, "Yes, Master You."

"I want to establish a spiritual contract with the Uchiha clan on behalf of the Ninja Hawk Clan. I also want your guidance to teach me how to master the natural energy in my body."

When Uchiha You heard this request, he didn't know whether to laugh or cry.

If the Uchiha clan accepts the Shinobi Hawk clan, the ninjas of the Uchiha clan will have four types of summoning beasts to choose from. Sorry, for the other Konoha ninjas, isn't their summoning beast resources too much?

Envy, jealousy and hatred!

Is there any?

Uchiha You felt that if he was not from the Uchiha clan, he would definitely have such emotions.

Moreover, Black Hawk actually asked for my guidance. This was too direct. The relationship between the two parties was not good enough. How could I help it for no reason?

But before he could open his mouth to refuse, the Black Hawk suddenly spread its wings, fully revealing its huge body.

I have to say, this scene is really shocking.

After the Black Hawk stood up straight, its height suddenly increased to nearly 30 meters, and its wingspan reached an exaggerated 51 meters, which could definitely be said to be blocking out the sky and the sun.

It went on to say: "There is too much natural energy accumulated in my body, but I can't digest it at all, forcing my body to keep growing."

"I really like my body to keep growing because it will make me stronger and better able to protect my people and Chengfeng Cliff."

"But five years ago, I realized that my body size had reached its limit. Continuing to grow in size would make me clumsy and my strength would decline."

"And I intuitively feel that if it continues to grow, my life will be in danger, so I have to ask you for help."

"Please teach me how to practice magic, digest natural energy, and save my life."

Black Hawk spread his wings, took a few steps back, leaned down, and made a gesture of surrender with his wings spread on the ground. He said sincerely: "Please save me, I am willing to give my loyalty."

Looking at this huge black eagle that almost covered the entire open space, Uchiha You's heart was pounding.

The refusal that was about to come to his lips was swallowed back by him.

He didn't expect that Black Hawk would directly offer his loyalty. How could he refuse?

Moreover, the combat effectiveness of the Ninja Hawk Clan of Chengfeng Cliff is considerable, and their mobility and surveillance are even more attractive. For the Uchiha clan and Konoha Village, they cannot refuse the contract with the Ninja Hawk Clan.

As for the Uchiha clan's possible envy and jealousy from ordinary Konoha ninjas because of the contracted ninja hawk, Uchiha You decided to push forward the integration plan in advance.

Once the integration plan is successful, this emotion will change from being directed at the Uchiha clan to being directed at the individual ninja who has awakened the Sharingan.

In this way, although the problem still exists, it is acceptable and easily resolved.

Uchiha You nodded and said, "Okay, I accept your request. Let me see how to solve your problem first."

Black Hawk was overjoyed when he heard this. Even though he was not good at saying nice things, he still thanked him clumsily.

It lay obediently on the ground, motionless, allowing Uchiha You to jump on its body and use natural energy to penetrate into its body for examination.

Uchiha You had just started the inspection when he knew that Black Hawk had a serious problem.

The problem was too obvious. Black Hawk was full of natural energy, but it was accumulated in his body without any organization, and even his meridians were completely blocked.

Because there was no flow of natural energy, Uchiha You couldn't find Black Hawk's meridians, and he couldn't tell whether the problem was caused by blockage in the meridians or some other problem.

But he knew that life lies in movement, and any extraordinary energy needs to flow.

Even his own golden elixir was absorbing and releasing natural energy every moment, as vibrant as a living being.

The most important thing is that because there is no flow, the natural energy in the Black Hawk's huge body is almost all accumulated in the torso. The important wings and legs are in a dry state, and it is completely supported by chakra.

As we all know, excessive use of chakra can cause damage to the body.

Most chakra professionals like ninjas are short-lived. Not only do many of them die in battle, but there are also many who die suddenly from serious illness after the age of 50.

Only ninjas like the Third Tsuchikage and the Third Hokage, who had retired from actual combat early because of their high positions and power, could live to the age of 70 in good health.

People like Uchiha Shinin and Uchiha Madara, because they had obsessions in their hearts, they had to endure the pain and suffer hardship and hold on.

With the energy support of White Zetsu and Nagato, Uchiha Madara was able to maintain a sufficient quality of life and even fight.

Before meeting Uchiha You, Uchiha Shinin had been living in agony. He couldn't eat anything every day, and hunger and severe pain tortured him every moment.

Being in excruciating pain is the norm for a ninja in his later years.

If the old ninja had a weaker willpower, he would have chosen to commit suicide like a patient in the advanced stage of cancer, rather than suffer in agony.

The black eagle's wings and legs are related to its basic survival ability. As its body becomes larger and larger, the burden becomes astonishingly large.

A body that is 30 meters tall and has a wingspan of 50 meters cannot be supported by physical strength alone.

Not to mention flying and attacking, even if he stood up, his leg bones would be crushed by his body weight.

Therefore, Black Hawk's wings and legs are constantly consuming a large amount of chakra to strengthen themselves, which means that he is continuously using ninjutsu.

This burden is too heavy, and it is only natural that the Black Hawk's strength has declined.

This is already considered good. If the situation continues to develop in this way, the Black Hawk's wings and legs will be broken within ten years, and death will be inevitable.

According to Uchiha You's understanding of Chengfeng Cliff, when the extremely powerful Black Hawk Ninja Clan died, the Ninja Clan would not be able to elect the next clan leader.

At that time, the unruly Ninja Eagles will choose to live alone, and the so-called Ninja Eagle clan will disappear.

Uchiha You decided to treat this handsome black eagle, as he couldn't bear to watch it die.

But Black Hawk's physical problems were so serious that he didn't know how to start.

He needed a healthy Ninja Hawk as a reference before starting treatment on Black Hawk.

So Uchiha You asked: "Black Hawk, do you have any children? Especially children who have absorbed natural energy?"

The shadow replied, "Yes. I have many children, but only one absorbed the natural energy."

Uchiha You nodded, turned around and jumped off the black eagle's body, and ordered it: "Bring your child here immediately. I need to understand the physical condition of the healthy ninja eagle before I can decide on your treatment plan."

"yes!"

Without any hesitation, Black Hawk jumped up with powerful legs, vibrated his wings, and gathered powerful wind chakra to propel his huge body into high-speed flight.

It turned into a black lightning and disappeared into the sky in the blink of an eye.

Uchiha You laughed in shock and said with emotion: "This speed is really shocking. If it is fully recovered, I wonder if it will be even faster."

"If Black Hawk turns a disaster into a blessing and successfully enters the immortal path and joins the ranks of demon immortals, will he be able to break through the limitations of time and space and achieve the ability to travel through space?"

“I’m starting to look forward to his performance.”

As Uchiha You paid more and more attention to Black Hawk, the way he referred to Black Hawk changed from "it" to the more anthropomorphic "he".

Just like what happened to Miwa Masayo.

The black eagle was extremely fast. In less than half an hour, it flew back with another large brown-black eagle on its back.

This eagle is not small in size, with a wingspan of 12 meters, making it a true giant eagle.

But compared with its father, it looks very petite.

Uchiha You carefully examined the big eagle named Gray Shadow and determined the direction of the meridians in the ninja eagle's body and the operation of its chakra.

He even gathered some natural energy and determined how Ninja Hawk absorbed natural energy by observing the absorption process of Gray Shadow.

Uchiha You was so shocked that he couldn't help but exclaimed: "How is it possible that the ninja eagle is born with defects in absorbing natural energy?"

"Life shouldn't be like this!"

"No, wait, I get it. It was chakra. Chakra that is easier to use than natural energy changed Ninja Hawk. This caused Ninja Hawk to be in the process of mutation and adaptation. Problems arose when faced with the simultaneous existence of two energies."

Uchiha You quickly thought of the situation when the magic was popularized in the Cat Castle. Including Maoyou, all the ninja cats that absorbed natural energy fell down, without exception.

Moreover, the stronger the talent in magic, the greater the damage will be. Even the most powerful Maoyou will face life-threatening danger.

But how did the three holy places solve this problem?

Uchiha You suddenly clapped his hands and figured out the problem.

In terms of the life hierarchy, slugs, toads and snakes belong to mollusks, amphibians and reptiles respectively. The complexity of their lives is far lower than that of homeothermic animals, so it is naturally easier for them to adapt to changes in the new environment.

It happens that the slug, which has the simplest life form, is the strongest, the second strongest is Gamamaru, and the relatively weaker one is the white snake, which has the most complex life form.

This is consistent with Uchiha Yu's inference.

Moreover, they should not solve all problems.

Whether it is the Wet Bone Forest, Myoboku Mountain or Ryuchi Cave, the practice of immortal arts is extremely difficult and even full of deadly risks.

There is only one slug in the Wet Bone Forest. She does not need to inherit the magic skills, nor does she teach them to others. Let’s not talk about her for now.

Myobokusan and Ryuchi Cave are both large families. The descendants of Gamamaru and the white snake need to work hard to practice magic and strengthen the power of the clan.

Therefore, there are countless stone toad statues in Myōboku Mountain and countless corpses in Ryuchi Cave. No matter what they say, it is impossible that they are all the corpses of humans who failed in practicing immortal arts.

The vast majority of them must be the descendants of Gamamaru and the White Snake, which means that they selected the surviving children through a large number of sacrifices, which resulted in more immortals, as well as giant snakes and toads.

Just think about it and you will know how exaggerated the reproduction efficiency of toads is.

How could Toad Pill have only two children?

It is impossible that the three brothers Bunta are the only children of Fukasaku and Shima.

They are actually just survivors among thousands of brothers and sisters.

If it is so difficult for cold-blooded animals, it is natural that it is even more difficult for warm-blooded animals with more complex life forms to adapt.

But there are five exceptions.

The brothers Ōtsutsuki Hagoromo and Ōtsutsuki Hamura are far more advanced life forms than humans. Their life forms are bound to be more complex, but they have no difficulty in mastering fairy arts.

This completely went against Uchiha You's inference, and he couldn't guess the reason.

The third exception is Hashirama Senju, who was able to successfully master the fairy technique by relying on the Wood Release Kekkei Genkai and the related characteristics of the Sacred Tree.

The fourth one is Uchiha Yuu, and the fifth one is Miwa Masaya.

Of course he knew exactly how he was able to master the magic without any trouble.

The key is that he split the natural energy into five spirits, corresponding to the five chakras, and absorbed the natural energy that matched his physique in different categories.

Because all natural energy is adaptable to itself, it will not cause any harm.

Analyzing from this angle, the problem with the Ninja Hawks is that their physical attributes are too pure. There is only wind-style chakra in their bodies, which is completely of wind attribute.

This means that the Ninja Hawk can only accept the natural energy of the wind spirit, and all other natural energies are harmful.

That's why Ninja Hawk's problem is so serious.

Once you find the problem, you can then find a way to solve it.

First, extract the unsuitable natural energy, then rebuild Black Hawk's meridians according to Gray Shadow's meridian structure, and finally let the wind spirit's natural energy start running.

The first two steps were both quite difficult, but the most troublesome one was the last one.

Because he didn't know how Black Hawk's wind spirit natural energy operated in his meridians, the only example he could refer to was himself.

With Miwa Masayo as a precedent, Uchiha You believed that if he followed his own example, the probability of success would be very high and he should be able to solve the problem.

But by doing so, he would be revealing his true identity to Black Hawk, a secret that only Miwa Masayo knew.

If this secret is leaked and is mastered by Myobokusan, Ryuchido, Shikotsu Forest and Pure Land, it is very likely to cause a qualitative change in the power of the four great sages.

By then, the risks faced by Uchiha You will increase dramatically.

We have to be cautious.

Uchiha You thought for a long time, and considering what Black Hawk had said about his willingness to surrender, he made up his mind.

He said to Black Hawk, "I found your problem and I also thought of a solution."

"But I can't guarantee that my judgment is correct, or even that your life is safe."

"Black Hawk, do you still want treatment?"

Black Hawk said without hesitation: "I am not afraid of death, I am only afraid of getting weaker and weaker. Please start the treatment!"

But Uchiha You did not start the treatment directly, but asked again: "Your treatment will let you know my secrets, can you keep these secrets?"

Black Hawk was stunned, but still said without hesitation: "Master You, I have promised you that if you can solve my physical problem, I will offer my loyalty to you."

"Please trust my loyalty."

Uchiha You looked into the huge eagle eyes and saw determination, calmness and clarity in them.

So he jumped onto Black Hawk's head and said with a smile: "I believe you, let's start now."

Then he commanded, "Stand up, spread your wings, and fly into the sky!"

"The best environment to heal your body is not the ground, but the sky, high up in the sky where the wind never stops!"

"The ninja eagle should be on top, soaring into the sky!"

"There are only two results for this treatment. Either Black Hawk recovers and becomes even stronger, or he dies heroically in the sky!"

Uchiha You's words aroused Black Hawk's heroic spirit. Endless heroic spirit surged in his heart, and he flapped his wings vigorously and soared into the sky.

Accompanied by a fierce gale, the Black Hawk turned into a black lightning.

With his powerful wings, he didn't even make any hovering movements, but flew straight into the sky at an angle of 75 degrees, leaving a straight trajectory.

While flying, Uchiha You took his first step, and a vast amount of chakra surged out of his body.

Fire Style, Water Style, Lightning Style and Earth Style, the four types of chakra, under Uchiha You's control, accurately surrounded Black Hawk's body and continued to accumulate.

The Black Hawk flew higher and higher, passing through the clouds, continuing to rise at high speed, and finally entered the stratosphere where the winds were strong.