Uchiha You felt the cold wind and was still not satisfied with the concentration of the natural energy of the wind spirit, so he ordered: "Continue!"

"Don't think about anything, just fly higher!"

Li——!

Upon hearing this, Black Hawk let out a high-pitched eagle cry. He had already felt the changes in his body.

Affected by the chakra surrounding the body, the natural energy that was as dead as stone began to move, even to boil, making Black Hawk feel as if his whole body was about to explode.

Since the effect was achieved so quickly, he had even more confidence in Uchiha You.

Ignoring the pain in his wings and enduring the illusion that his body was swelling to the point of almost exploding, Black Hawk flapped his wings with all his might and continued to fly high.

The Black Hawk flew higher and higher, the temperature became lower and lower, and the azure blue sky gradually turned into dark blue.

When his breathing became extremely heavy and he flapped his wings with all his strength but didn't feel enough power, Uchiha You was finally ready.

Following the attraction of the natural energy in the black shadow's body, he actively poured his chakra into Black Hawk's body from his head.

Under Uchiha You's precise control, the four attributes of chakra were completely independent, yet entangled with each other, rotating at high speed and generating a powerful attraction.

With Uchiha You's control ability, even if the chakra entered Black Hawk's body, he still maintained sufficient control.

Natural energy and chakra have a strong tendency to combine, and the attraction of pure chakra is even stronger.

The fire spirit, earth spirit, lightning spirit and water spirit in Black Hawk's body were separated and combined with Uchiha Yu's chakra to form the fairy chakra.

After the synthesis of the Senjutsu Chakra, Black Hawk's body was affected. Because it was unable to adapt and absorb it, it underwent inorganic changes.

Like a toad being petrified, Black Hawk's internal organs began to be petrified, causing him to feel extreme pain and fear of his life instinct.

Black Hawk forced himself to suppress his fear, flapped his wings desperately, fanned the thin air, and focused all his attention on "flying higher".

At this time, Uchiha Yuya had already tried his best.

He controlled the synthesized Senjutsu Chakra and made it flow out of Black Hawk's body at the fastest speed, dissipating it without regard for waste.

The fairy chakra is mixed with the natural energy in the black shadow's body. These natural energies have been accumulated in the black shadow's body for a long time and have long been contaminated by his aura.

Therefore, Uchiha You's control over the fairy chakra was not strong enough, and the speed at which it flowed out was not fast enough, so damage was inevitable.

Fortunately, Black Hawk's body is large enough and his physique is very strong, enough to kill the ninja, so the petrification effect is not fatal to Black Hawk.

Just like cancer can kill humans but not whales.

The petrification caused by the fairy chakra is equivalent to a small stone growing in the body of the black shadow.

It's a bit painful, but definitely not fatal.

A large amount of fairy chakra flowed out from the tail of the black eagle like a jet. Because the concentration was too high, it actually appeared in various colors.

Looking from afar, the Black Hawk looked like a rocket, spewing the energy of a rainbow and flying high into the dark blue sky.

As the fairy chakra continued to leak out, the natural energy in Black Hawk's body rapidly decreased, and at the same time it was also purified, changing into pure wind spirit natural energy.

The burden was lightening rapidly, and at the same time, the nourishing effect of the Wind Spirit's natural energy began to show, and Black Hawk felt better and better.

The pain in his wings disappeared and his strength grew stronger and stronger. Even though the air became thinner, his flying speed actually began to increase.

When the sky turned almost dark with stars twinkling above it, the natural energy in Black Hawk's body finally completed its final purification.

He cried out again excitedly, but because the air was too thin, the eagle's cry was not loud.

But Uchiha You, who was standing on top of Black Hawk, heard it and felt Black Hawk's excitement and joy. He stepped on Black Hawk's head, encouraged the natural energy and said, "Now let's start the second step. Pay attention to my operation and remember the flow of natural energy and the handling of the body's chakra. Don't make any mistakes in the details."

Uchiha You's natural wind spirit energy poured into Black Hawk's body and turned into a drill under his control, reshaping the meridians according to the meridian structure of Black Hawk's son Gray Shadow.

At this moment, Black Hawk felt sore, numb, painful and itchy. At the same time, he lost control of his body and floated down.

But he firmly remembered Uchiha You's reminder, and regardless of the discomfort in his body and the fear of falling, he concentrated his attention on feeling the development and flow of the natural energy of the wind spirit in his body, and tried hard to remember all the details.

Just when the two of them were concentrating their attention on Black Hawk's body and had no time to pay attention to changes in the outside world, an accident happened.

The route of Black Hawk's fall was exactly the same trajectory it had flown, wrapped in the fairy chakra that flowed out of his own body.

The violent friction between the feathers and the air did not generate high temperature, but accumulated a large amount of static electricity, which attracted the lightning chakra in the fairy chakra.

The gathering of fairy chakra attracted the natural energy of thunder spirits in the sky and also gathered on the feathers on the black eagle's body.

The dense appearance of short electric arcs made the Black Hawk look like a large light bulb, and its shape and outline could not be seen clearly.

This is the release of energy from the more powerful and active Senjutsu Chakra.

As the amount of senjutsu chakra increased, the tiny arcs quickly turned into forked lightning and tree-like lightning, and transformed into large-scale discharges.

There was a dense source of lightning in the sky. Lightning of complex shapes clustered together to form a spherical minefield with a diameter of more than 20 kilometers.

During the violent discharge process, the fairy chakra is quickly consumed and continuously attracts the natural energy of lightning in nature.

Thanks to the filtering of lightning, a layer of pure natural thunder spirit energy gathered on Black Hawk's body surface, and began to penetrate into his body along the meridian channels opened up by Uchiha You.

The infiltration was so subtle and silent that neither Uchiha You nor Black Hawk noticed it.

By the time Uchiha You discovered it, the wind spirit and the thunder spirit had been completely mixed together, forming a strange state that was clearly distinct yet inseparable.

The strange fusion of the two attributes of natural energy made it impossible for him to distinguish or eliminate them.

Uchiha You could only observe carefully, and soon confirmed that the new natural energy was harmless to Black Hawk's body. The Thunder Spirit even effectively stimulated the vitality of Black Hawk's body, which significantly accelerated his self-healing speed.

Uchiha You couldn't help but laugh, and said with emotion: "This is a blessing in disguise. After going through so much hardship for so long, once we escaped from the predicament, we welcomed the wind and thunder gathering."

As the Black Hawk was falling, he only lost control of his body but did not lose consciousness.

After hearing what Uchiha You said, Black Hawk was naturally very happy and began to look forward to regaining strength after his body recovered.

The work of opening up Uchiha You's meridians was not difficult, because Black Hawk already had meridians in his body, they were just blocked.

As he operated, he easily found the original traces of the meridians. He only needed to apply a little force to reopen them. Even some of the nodes were not difficult.

The real trouble is that the traces in some places are stuck together, and places that should not be connected are connected. The difficulty of rebuilding the barrier is much greater than that of penetrating it.

Uchiha You divided his mind into several parts, patiently dealing with different problems, racing against time to penetrate Black Hawk's meridians.

The work of developing the meridians is completed until the meridians are connected into a circulation circuit and finally the acupoints at the tail end of the body are closed.

Uchiha You spoke again to remind him: "Black Hawk, the next step is the final key. I will use my own power to drive the flow of your natural energy, but you have to take over step by step and control it yourself."

Black Hawk replied respectfully: "Yes, Master You, I will try my best!"

Uchiha You injected more of his own wind spirit natural energy into the black shadow's body, which wrapped up the wind and thunder natural energy in his body and flowed along the meridians.

At the beginning, it was extremely difficult to promote it.

It's not that it's extremely energy-consuming, but it's difficult to control the natural energy of others, and Uchiha Yuu's own wind spirit energy is often the only one running.

Uchiha You felt as if he was dragging a greasy car. No matter where he grabbed, his hands would slip and he had strength but couldn't use it.

Fortunately, the natural energy in the Black Hawk's body belongs to the Wind Spirit and the Thunder Spirit, which are very active by nature, and its running speed gradually increased.

After completing the first big circle, the basic cycle is established.

And Uchiha Yu's feeling also changed, from dragging to pushing.

Although it still feels slippery, it is indeed easier to exert force and the running speed is significantly improved.

By the time the sixth great cycle was completed, Black Hawk's natural energy circulation speed had reached Uchiha You's expectations, and the meridian absorption effect also began to show.

The natural energy of wind spirit and thunder spirit scattered throughout the body is attracted into the meridians, further accelerating the circulation.

But Uchiha Youya discovered that his natural energy was drawn into the core of the meridian circulation and could not be recovered.

After several attempts, he finally had no choice but to give up, allowing the natural energy that was deeply imprinted with his own aura to remain in Black Hawk's body and run through the core of his meridians.

No matter what negative effects may arise in the future, it is better than breaking the meridian circulation that he has worked so hard to establish now, because if the current circulation collapses, Black Hawk will die.

The establishment of meridian circulation is of great significance to life.

This is an advancement in the level of life, equivalent to a country's advancement from a small peasant economy to a commodity economy.

In the era of small peasant economy, money was only auxiliary, and any change would not lead to the collapse of the country. But in the era of commodity economy, the amount of money would be a fatal disaster.

With Uchiha Yuu's withdrawal, Black Hawk took over his meridians.

At the same time, he regained control of his body, began to flap his wings vigorously, and started flying again.

Black Hawk discovered that You's opened meridians were not only in his torso, but also in his wings and legs. With the flow of natural energy, his strength increased greatly.

He felt his body becoming lighter, and the power of his wings and claws becoming stronger. With just a few light vibrations of his wings, he completely eliminated the momentum of falling.

Black Hawk also felt a powerful vitality emerging from his body, and the shadow of death that had plagued him for many years had completely dissipated.

Li——!

He excitedly let out a high-pitched eagle cry to express his excitement and joy.

Boom——!

Black Hawk's voice was interrupted by even louder thunder, and a thick bolt of lightning struck his head, as well as Uchiha Yu above his head.

But Uchiha You was immune to lightning, and the lightning completely slipped through his body and finally hit Black Hawk's body.

A huge electric current flowed through his body, and the powerful natural energy of the thunder spirit squeezed into his meridians, forcefully changing the proportion of the natural energy attributes in the meridians.

The Black Hawk's body was undergoing drastic changes both inside and outside, and he had no idea what was happening. He was completely stunned.

He instinctively spread his wings to stabilize his flying posture, which brought on even more violent thunder.

Uchiha You knew what was happening. This was a thunder tribulation, and he was very experienced.

"Black Hawk! This is a thunder tribulation, a test from the world for your life level to rise. As long as you persevere through it, you will officially embark on the path to immortality, and your strength and lifespan will be greatly increased."

Black Hawk asked, "Master You, what if you can't hold on?"

Uchiha You answered bluntly: "If you can't survive, of course you will die."

Black Hawk was not afraid when he heard the word death. Instead, he laughed heartily.

"Great, there's a risk of death, so the rewards must be great."

"I will definitely be able to hold on to the end, and I will definitely become an immortal!"

Uchiha You was very satisfied with Black Hawk and said with a smile: "It's not about becoming an immortal, but following the immortal path I opened up and embarking on a new path."

"Black Hawk, if you can hold on, I will consider you my fellow Taoist!"

"You will become my most trusted... friend. I will share most of my secrets with you. In the vast ninja world, you are second only to Miwa Masayo."

Black Hawk was overjoyed: "I am extremely honored to be a fellow Taoist of Youxianren!"

He flapped his wings and rushed forward towards the fierce lightning: "I will never let Youxian down, I will succeed!"

Black Hawk's huge body soared in the thunder and strong wind, with lightning swirling around his body, and the fierce lightning strikes injured his body.

Amid the wind and thunder, broken feathers and bright blood beads were scattered all over the sky.

But the Black Hawk's flying posture did not move at all. It was clearly an eagle flapping its wings and flying high, but its body stood tall in the sky like a mountain.

Black Hawk's bravery and fearlessness greatly shocked Uchiha You.

His courage to move forward without flinching in the face of danger and difficulty put his soul under great test.

【Did I do something wrong? 】

[Yes, I was wrong! ]

What did Uchiha You do wrong?

Of course, it was after he killed the Third Hokage that he possessed power exceeding that of Hashirama Senju. He despised Hashirama Senju's innocent ideals, but he planned to stay behind the scenes to control the ninja world and not take the initiative to eliminate wars and other ninja villages.

He is not laughing at someone who is only fifty steps away, but rather he is laughing at someone who is only a hundred steps away.

All the difficulties and the lack of strength of Konoha Village are just excuses.

No matter how difficult it is to lead Konoha Village to unify the ninja world now, can Hashirama Senju convince Uchiha Madara to unify the Land of Fire with two families?

Hashirama Senju only knew that it was difficult, and he didn't know what goal he could achieve, nor did he know whether he could succeed, but he still rushed forward fearlessly.

Uchiha You had seen successful examples and knew the greatest benefits of unification, but he cowered and hid himself, thinking of handing all the work over to one of the Four Hokage, Orochimaru, and to the future Hokage.

This is nothing but cowardice!

He is just afraid of the Six Paths Sage Otsutsuki Hagoromo, who has unclear information, is high and mighty, and is full of arrogance!

Uchiha Yu raised his hand, but did not slap himself.

Because he had made his decision and no longer needed a slap in the face to motivate himself.

It's not that I'm afraid of pain, nor am I afraid of being embarrassed.

real!

…

The thunder tribulation was just as fierce as in memory, and its target was just as tragic.

The Black Hawk had no idea how many lightning and thunder bolts it had endured. Its feathers were all torn to pieces, and it looked like a plucked chicken, or one that had been burnt.

Even without feathers, this chicken, no, this eagle has no intention of giving up or retreating.

He used the natural energy of the wind spirit as feathers, propelling his body to fly at high speeds, while emitting increasingly high-pitched eagle cries, chasing after lightning and actively accepting the test of thunder.

The black eagle even opened its sharp hooked beak to swallow the scattered lightning and strong gales, madly absorbing the natural energy of the thunder spirit and the wind spirit to strengthen its own meridian circulation.

He didn't care about the severe pain and danger at all, and his only thought was not to admit defeat.

How can a mere celestial being make an eagle soaring in the sky admit defeat?

Unconsciously, the natural energy released by the Black Hawk's flapping wings turned into a combination of wind and thunder. Lightning was mixed in the whirlwind, giving the Black Hawk even more powerful power.

A charred naked chicken, surrounded by storms and lightning, fought against the sky in an even more violent catastrophe.

Uchiha You suddenly felt a movement under his feet. He looked down and found that black feathers with a hint of gold were emerging.

The charred skin all over the black eagle's body was peeling off, and on the exposed snow-white skin, feathers were growing rapidly.

Well, it looks uglier.

But soon, the feathers grew bigger and covered the black eagle's body again, and he became the handsome black eagle again.

But black eagle is no longer enough to describe it. These new feathers are no longer pure black. The root tubes of the feathers are obviously golden, but the edges of the feathers are light blue.

When natural energy flows through, the black color between gold and blue will emit dazzling five colors.

People need clothes, Buddhas need golden ornaments, and eagles need feathers.

The ancients were not deceiving me. This eagle has become more beautiful and full of mysterious temperament.

Li——!

The Black Hawk also felt his own new life and let out an eagle cry full of hope, piercing through the clouds and tearing through the clouds of disaster.

A ray of golden sunlight shone down and fell on Black Hawk, making his whole body radiate golden light, like a golden eagle made of gold.

Black Shadow's tribulation ended, and under the guidance of Uchiha Yu, he embarked on the path to immortality.

Uchiha You laughed heartily: "Congratulations on surviving the heavenly tribulation, fellow Daoist Black Hawk!"

Black Hawk responded excitedly: "Thank you for your guidance, Master You!"

Uchiha You shook his head and said, "Daoyou Black Hawk, from now on you and I should address each other as Daoyou. The road to immortality is long, and we should encourage each other."