Fox Demon: Heaven rewards diligence; I will eventually achieve divine mastery of martial arts.

Instead, the two forces began to converge continuously.

It was as if a bottomless vortex had appeared in Lin Yu's chest cavity, absorbing all kinds of energy.

Facing this suction force, Lin Yu gathered his inner strength and spiritual power to the fullest, determined to satiate it no matter what.

Energy surged wildly.

A faint aura gradually grew stronger with the input of energy.

"Boom!"

"Dong dong!"

Lin Yu's heart began to beat faster involuntarily.

A strong and powerful heart mobilizes the blood and energy throughout the body, causing it to boil.

Blood and vital energy also joined in, disappearing into that bottomless pit.

As internal strength, mental strength, and blood and qi are consumed more and more.

The light in Lin Yu's eyes grew even brighter.

He wanted to see what kind of dantian would be developed for him after absorbing so much of his power.

The power was continuously poured in.

Outside, Lin Yu's figure stood in the air, from day to night, and then from night to dawn.

Time turns, day and night alternate.

Shi Kuan looked at Lin Yu calmly, without the slightest hint of anxiety or impatience.

Compared to the countless lifetimes he had spent waiting for the princess of the Demon-Controlling Kingdom, the current wait meant nothing to him.

Especially when he sensed that a faint aura was gradually accumulating around Lin Yu, his anticipation made him even more willing to continue waiting.

I don’t know how much time has passed.

The dantian in the chest cavity finally stopped absorbing internal energy, spiritual energy, and blood and qi.

Even though Lin Yu was mentally prepared, he couldn't help but be somewhat surprised by the construction of the middle dantian.

Because the investment is just too large.

It's no exaggeration to say that the cost was even greater than the battle against the Dao Alliance.

Not only was his mental strength somewhat weak, but his internal energy was also somewhat depleted, not to mention his blood and qi.

If this continues, it will probably drain him completely in about half a day.

It should be known that even such a tiny bit of qi can cause the earth to shake.

This time, Lin Yu was almost completely drained, which shows just how terrifying the energy required in this middle dantian is.

Lin Yu finally understood why there was no reaction before his mental strength broke through.

That's because they simply don't think much of it.

Previously, his mental energy wasn't even enough to build a middle dantian; even if you squeezed it dry, it wouldn't be enough.

Fortunately, this time it went relatively smoothly and there were no problems.

As the absorption of power by the middle dantian gradually decreases.

A mysterious aura began to emerge.

Sensing this aura, Lin Yu focused his attention, knowing that the final moment was approaching.

Under Lin Yu's "gaze," that mysterious aura grew even stronger.

Internal energy, spiritual energy, and blood energy—three different energies—began to entangle wildly.

A sharp pain began to spread from my chest, somewhat like the feeling I had when my pineal gland was being developed.

Under the influence of this pain, Lin Yu felt as if his whole body was being torn apart from the middle.

The three streams of energy that had gathered in the chest cavity were completely and utterly churned into chaos.

The pain is getting worse!

In Lin Yu's vision, he seemed to see something slowly breaking through his flesh and blood, forming a brand new, strange thing.

However, all of this is just an illusion.

Despite the pain, Lin Yu felt the chaotic energy begin to circulate, faintly taking on a strange flavor.

The speed of the chaos's twisting gradually increased, and under this acceleration, Lin Yu was surprised to find that other colors appeared in the chaos.

It was a pure black and an extreme white.

'yin and yang?'

The moment Lin Yu saw these two colors, those two words suddenly popped into his mind.

As a person from the Dragon Kingdom in my previous life, I was absolutely familiar with these things passed down from our ancestors, even if I didn't understand them.

Under his tense yet expectant gaze, two completely different auras emerged: one domineering and fiery, the other cold and indifferent.

These two auras are clearly opposite, even incompatible.

But ironically, it is precisely what forms the structure of his middle dantian, and not only that, it has even achieved a state where you are in me and I am in you.

Looking at his own middle dantian, which was being built and was slowly taking shape, resembling a yin-yang symbol.

Lin Yu's eyes were filled with astonishment at this miraculous change.

But as the middle dantian gradually took shape, surging gray mist, like a deity descending from the sky, burst forth from the middle dantian.

It rolled triumphantly towards every part of the body, every corner.

That unbridled attitude seemed to be declaring who the real boss was.

Wherever the qi passed, internal strength and spiritual power all retreated into the dantian, and the ease and peace of the past were gone.

Lin Yu carefully observed these energies and quickly noticed the differences.

If the previous Qi was made by mixing two different colored stones together, it would appear as a gray mass from a distance, but upon closer inspection, one could still distinguish between the white and black stones.

The current internal energy is completely different.

No matter how you look at it, there is no longer a distinction between black and white; all that remains is pure, extreme gray.

After making a triumphant turn around in the body and declaring its status, the qi swarmed back to its nest.

At the middle dantian, surging qi began to circulate along the meridians in a continuous cycle, just like the internal energy of the past.

Looking at the surging gray fog, Lin Yu tentatively tried to compress it.

However, no matter how hard he tried, he could not compress his internal energy as easily as he could with his internal force.

Clearly, even in its current fog-like state, the energy it contains is considerable and cannot be easily compressed.

With his newfound experience, Lin Yu began to make plans in his mind.

It is estimated that this protective energy will also go through a process from gaseous to liquid and then to solid.

Looking at the clear black and white colors, a bright smile appeared on Lin Yu's face.

Because he knew that as his strength increased, the surprises that followed would only grow greater.

'It's time to go out now; we can't keep them waiting.'

In the sky, the first rays of sunlight illuminate the world as the sun rises above the setting sun.

Lin Yu opened his eyes in the sky, a faint gray glint flashing in them.

He looked at Shi Kuan, who had been waiting for who knows how long, a smile spreading across his face, his eyes gleaming with a flame of fighting spirit.

"Awaited."

Their eyes met in mid-air, and without another word, everything was understood without being spoken.

The next day.

Lin Yu left Beishan and headed towards the Martial Alliance.

As for the outcome of his sparring match with Shi Kuan, that remains unknown.

Whether they win or lose, Lin Yu and Shi Kuan are long past the age of bragging about taking a few punches from their opponents, like Mu Shenqi and others.

On the way, he recalled the gains he had made from this breakthrough, as well as his battle with Shi Kuan.

Lin Yu felt extremely satisfied.

What is the purpose of spiritual practice? After basic needs like safety and security have been met, it is more often a pursuit.

If you can find a suitable opponent during this process, that would be even better.

Upon returning to the Martial Alliance, Lin Yu sensed that something was amiss.

Everywhere you look, there are busy figures, and a somber atmosphere prevails.

"Lord Leader."

Upon seeing Lin Yu's return, many people bowed in respect.

What has happened during this time?