Black flames enveloped Chu Du's body, constantly tempering his body.

I have to say that the effect of this exercise is indeed amazing, and Chu Du's current body, in the same realm, is almost a perverted existence.

However, Chu Du's brows furrowed slightly.

The ancestral exercises of the Xiao Hei family divide the physical body into: mortal body, golden body, divine body, Taoist body, holy body, and immortal body...... And so on!

Profound and mysterious!

Once you have cultivated to the fullest, you will be invincible with one punch, suppressing the eons of eternity!

This is also the reason why Chu Du said that this exercise is against the sky.

At the same time, this body refining method is extremely difficult to cultivate!

Not to mention the golden body, the divine body, and the holy body in the back...... The first realm of mortal body alone is divided into five small realms - refining skin, changing tendons, forging bones, washing marrow, and exchanging blood!

According to Chu Du's analysis, after these five small realms are refined to the fullest, their power is extremely terrifying, probably corresponding to the cultivation realm of the five immortals of enlightenment, oven, creation, yin and yang, and all things!

When the Dao of Body Refining transforms the mortal body and achieves the immortal golden body, it is even more comparable to the Dao realm!

Now, after such a long period of cultivation, his body has been tempered to the first layer of the mortal body of the first realm of body refining-skin refining!

Close to consummation!

The next step is to change the tendons, forge the bones, wash the marrow, and exchange the blood!

The skin refining is complete, the skin is as thick as the city wall, invulnerable, the power is ten thousand, the mountain is cracked, and the divine power is amazing.

Easy tendons, tendons like a real dragon, strong like a dragon elephant, explosive and fierce, within a hundred steps, invincible in close quarters, beat all enemies!

The realm of forging bones, iron bones, fist breaking magic weapons, power to pull out mountains!

After washing the marrow, the qi and blood are like rainbows, shaking the heavens and the earth, fast as thunder, moving like a dragon, the flying sword is difficult to hurt, and the magic weapon is difficult to destroy!

The flesh is exchanged for blood, transcendental, no disease, no poison, and all kinds of spells of the immortal are almost ineffective against it!

And that's just the mortal body!

Once you can exchange blood, you can go one step further, transform from a mortal body into a golden body, and refine the golden body without destroying it, and its terrifying degree is terrifying!

"Now my body refining skin has not been perfected, and it is extremely difficult to break through to Yijin after that, no less than breaking through from the opening to the oven realm!"

Chu Du's gaze was deep, "But once the physical body can break through to the Yi Tendon, then, most likely, I will be able to open up the sevenfold initial oven!"

With his current accumulation, the six-fold initial oven has reached its limit!

If he wants to open up a higher-level oven, he can only start from other aspects, and strengthening the flesh body is the best choice at the moment!

And when he steps into the oven realm in the future, the more layers the initial oven opens up, the greater the benefits he will get when he receives the baptism of heaven and earth, and the flesh will be stronger when he feeds the flesh body!

It's a win-win!

In the quiet night, in Xiao Hei's room, Chu Du was shrouded in black flames, constantly tempering his body!

Chu Du's powerful divine soul is carefully observing!

Every trace of flesh and blood on the surface of his body was filled with a faint black flame, tempering every trace of flesh and blood!

Skin and flesh are indistinguishable from skin and flesh!

Refining skin is not only a layer of skin on the surface of the body, but every muscle of the whole body, refining skin is more precise, refining skin and meat!

And easy tendon is a deeper tempering!

It's just that now, most of the black flames that Chu Du's cultivation has only shrouded the surface of his body, tempering the skin, and has not entered the flesh!

When is it like Xiao Hei, when all the black flames are refined into the flesh, it can be regarded as the perfection of the skin refining realm!

"Whew!"

After Chu Du exhaled a breath of turbidity, he suddenly took a deep breath!

With that, the flames that enveloped his whole body began to shrink inward!

Keep compressing!

The originally vigorous flame gradually turned into a thin layer as thin as a piece of paper, covering the surface of Chu Du's skin!

And the faint black flame contained in the flesh and blood in his body immediately became rich!

"Shhh

Severe pain!

made Chu Du's face pale!

The path of cultivation is originally gradual, and with Chu Du's current body, he can't withstand the tempering of too thick black flames at all!

However, Chu Du did not stop!

Little by little, try to keep squeezing more of the black flames into the flesh!

"The path of cultivation is too much, once the cultivation intensity exceeds the limit of the body's endurance, it will be harmful and cause serious consequences to the body!"

Chu Du understands this truth very well.

Just like an ordinary person running for exercise, his physical fitness can afford him to run five kilometers, but he has to run a hundred miles, that is looking for death, and the only result is muscle strain, physical injury, and mental collapse!

"But if you run seven kilometers, eight kilometers, and ten kilometers, you are still within the range of bearing!"

Physical fitness can afford a person to run five kilometers, then this person's limit must be more than five kilometers, gritting his teeth, running to seven kilometers, is definitely not a problem, and if you fight hard, eight or nine kilometers is also possible, and ten kilometers, it may be the limit, once this limit is exceeded, it will really hurt the body!

Chu Du endured the severe pain coming from his whole body, and secretly thought to himself: "Now, what I am looking for is this limit value!"

Only by maintaining this limit value can he reach the fastest cultivation speed!

Chu Du continued to compress the black flames on the surface of his body, and more and more black flames seeped into his flesh and blood.

On his forehead, there were beads of sweat dripping from pain!

But soon, it was evaporated again!

The process of tempering the body with black flames is not only the strengthening of the physical body, but also the tempering of the spiritual will!

The flames on the surface of Chu Du's body are getting thinner and thinner!

His body was constantly trembling, but Chu Du's eyes were calm!

Manipulate more black flames into the flesh.

Thirty percent, fifty percent, ninety percent......

It wasn't until the black flames in Chu Du's flesh and blood were twice as thick as before that a strong sense of crisis rose in Chu Du's heart that he finally slowed down!

Double, double, triple......

When the black flame was a little four times thicker than before, Chu Du finally stopped!

Maintain this concentration and keep tempering your body!

The time of the night passed quickly!

When Xiao Hei woke up from the secret of Shenwu the next morning, he was immediately startled when he saw Chu Du who was cultivating cross-legged, and his immature and innocent face changed, and he instantly arrived in front of Chu Du, and wanted to reach out to interrupt Chu Du immediately, but he suddenly stopped!

When cultivating, the most taboo is to be disturbed!

What is Chu Du, this bastard, doing? Is this how you cultivate?"

Almost all of the little black eyes are breathing fire!

Chu Du in front of her is almost thinner than last night, and the clothes that originally fit are much looser when they go up, hanging on his body!

Xiao Hei is about to die of anger!

Looking at the faint black flames on the surface of Chu Du's body, she almost immediately understood what was going on!

"The strength of your body has not reached the corresponding level at all, where did you come from so boldly to refine your body like this?"

She wanted to shoot Chu Du to death, Chu Du was joking with his own life, what did Chu Du think?

"Whew!"

Chu Du dispersed the black flames, moved his body, and felt a feeling of soreness all over his body, this was the sequelae of extreme cultivation!

"Crackle!"

However, he suddenly clenched his fist, and there was a bang, and the air was pinched by him!

Overnight, the strength of his physical body increased a lot, and at this rate, he would soon be able to refine his skin perfectly!