Although it was difficult for an ordinary person to clearly understand this extremely dense evil energy, it wasn't difficult for Ming Yu.

With the healing energy of the ancient jade, Ming Yu's body was recovering little by little, and the evil aura was slowly disappearing.

Ming Yu was simply too tired. The previous upheavals had left him physically and mentally exhausted. With Gu Yu healing him, he only felt dizzy, and he quickly entered into a meditative state.

Using his blood to infuse the ancient jade and convert it into healing power, then returning it to his entire body would allow him to recover, but it would also have its own drawbacks.

However, his heart needed continuous blood circulation, and it would take him half a month to recover, so he could not see anything wrong with it. However, if Ming Yu was severely injured and recovered like this, then his heart would probably be unable to bear the burden.

This was the price of Ming Yu recovering at an astonishing speed. However, this price was already extremely small, and ordinary people would not be able to obtain it!

While he was recovering, five days passed in a single sitting.

After five days, Ming Yu's chest wound had basically recovered, but Ming Yu did not wake up from his meditative state. Instead, he continued to rest.

After experiencing such a huge upheaval, Ming Yu was simply too tired. Now was the perfect time for her to rest.

The surrounding heaven and earth spirit energy was continuously absorbed by Ming Yu's pores, and then all gathered into the ancient jade. Gu Yu removed the mixed parts of the heaven and earth spirit energy, and then returned the pure heaven and earth spirit energy back into Ming Yu's body.

What Ming Yu needed to do was to convert the heaven and earth elemental energy into true energy that she could use to temper her own body.

Not only that, a portion of the pure elemental energy of the world also flowed into the Deity's Lake, causing it to become even purer.

When he had pulled out the Netherworld Sword, Ming Yu had used up a large amount of his willpower. Thus, the stone at the edge of the Deity's Lake had already started producing cracks that were difficult to detect.

On the surface, this kind of crack wouldn't affect Ming Yu too much, but if he let this go on for too long, then Ming Yu's divine sense wouldn't be able to stabilize itself. Once the Deity's Lake broke under the pressure that exceeded his limit, then no matter how much water he had from the Deity's Lake, it would still be completely drained.

Because of this, the pure elemental energy of the world flew to the rocks at the edge of the Deity's Lake and continued to moisturize them, repairing all the cracks. They were as smooth as white jade and became even more solid than before.

This meant that Ming Yu's willpower was tougher and harder to destroy!

Just like this, time passed unknowingly as he continued nourishing his body and cultivating. When Ming Yu opened her eyes once more, half a month had passed.

"Phew …"

Ming Yu let out a breath of air. Although the light in the cave was dim, Ming Yu felt that he could clearly see everything in the cave. Whether it was his vision or his mind, both became stronger!

The strength of his mental strength and the fullness of the Deity's Lake caused Ming Yu to feel the potential of his body being drawn out. He felt that he had gained another three hundred lions' strength.

In other words, in terms of strength alone, Ming Yu already had the strength of 6800 lions!

With the addition of Burning Blood, Ming Yu's strength was infinitely close to that of the Nether Master.

However, Ming Yu understood that the current him was still no match for the Nether Master because he had already cultivated the Nether Enlightenment Art to its peak. The fiendish demonic energy in his body was simply too terrifying and its power was shocking.

Otherwise, half a month ago, when Mingyu had used the Jadefallen Flying Knife to stab into the body of the Nether Master, the Nether Master should have already died.

Although Ming Yu had already escaped, he knew in his heart that the Nether Master was definitely not dead. Moreover, in this half a month, Ming Yu was recovering, so the Nether Master was definitely recovering as well. Perhaps he had already reached his peak state again!

"So what if you've recovered? You've reached the limit of what I can do, and I'm still growing!"

A hint of confidence flowed out of Ming Yu's eyes, but when Ming Yu brought out the memories of the eighth move of the extreme Yin Yang Arts, he became vexed.

Now that he had reached the peak of the seventh level of the Transcending Mortality Stage, he would only need to complete one more step in order to reach the eighth level of the Transcending Mortality Stage. However, this step was not something that could be achieved simply through cultivation …

The cultivation method for the eighth form of the Limitation Yin Yang Art wasn't just a cultivation method. It was also a way to refine a person's physique. It could be said that the first seven forms of the Limitation Yin Yang Art were built for this eighth form.

And this move was called: Body of Yin and Yang!

The extreme yin and yang arts pursued one's limits, and the yin yang body was the combination of the extreme yang blood and flesh, the combination of the extreme yin origin soul!

Once the yin yang body was formed, the zhen qi in the blood and flesh of the Ji Yang would be able to trigger the extreme fire element in the air, while the water in the lake would be able to attract the extreme ice element in the air.

The flame mainly attacked the enemy's body, while the ice mainly attacked the enemy's mind. It could be said that the yin yang body was an extremely powerful existence!

Ming Yu was suddenly enlightened. The first layer of the Ancient Yin-Yang Tactic was not only a cultivation technique, but also a secret technique to change one's physique. It could be used to refine a battle body, and this battle body was the yin and yang body!

The eighth level of the Transcending Mortality Stage was originally meant for returning to the origin realm. One needed to integrate the body and the mind, and the yin and yang energy also needed to integrate the mind and the body.

Ming Yu's scalp tingled with numbness at the thought of the power of the yin and yang energy. However, to refine the yin and yang energy body, one would not only need to refine all seven parts of the extreme yin and yang technique, but also need two types of extreme energies in order to succeed.

Regardless of whether it was the Supreme Yin or Supreme Yang treasure, they could all be anything, but these things had to have extreme attributes.

For example, a three thousand year old Extreme Yin or Extreme Yang medicine, or the heart of an ice or peak ninth stage fire attribute profound beast …

As for the Ji Yin, Ming Yu had actually already forged one because when he had pulled out the Netherworld Sword, the water in the Deity's Lake had already been refreshed and tempered.

Once the Deity's Lake was large enough, its diameter wouldn't change, but its depth would continue to increase. Although the size of the Deity's Lake did not seem to have changed on the surface, the truth was that the purity of the Deity's Lake had once again increased. Furthermore, the depth of the Deity's Lake had already reached thirty meters!

This also meant that Ming Yu's spiritual force had already surpassed his flesh and blood in terms of energy. This made Ming Yu feel like he was a cripple, a person who had the appearance of a yin and yang.

Therefore, in order to cultivate the Body of Yin and Yang, one needed something. It could be a precious medicine, or it could also be the heart of a ninth level pinnacle mystical beast …

And a ninth level pinnacle mystical beast was a tenth level ferocious beast!

In this Ten Thousand Beast Blood World, all of the Level 10 Ferocious Beasts possessed a rare bloodline of wrath. And the bloodline of rage belonged to the Ji Yang. Thus, every Level 10 Ferocious Beast here possessed the attribute of extreme Yang!

"I don't know if Ming Xuan and his men have managed to kill Level 10 Ferocious Beasts in this period of time, but if I go all the way and kill them when Ming Xuan is exhausted, I might be able to steal their hearts!"

Thinking of this, Ming Yu became especially excited.

This way, he could not only slow down Mingxuan's progress of gathering all nine hearts, but also help him break through to the eighth level of the Transcending Mortality Stage, the Essence of Yin and Yang; he could truly kill two birds with one stone!

However, Ming Yu was not complacent at all. He had let his guard down, and was well aware of his own abilities.

With his current strength, if he couldn't even defeat the Nether Master, how could he steal the heart of a rank 10 vicious beast from Ming Xuan?

The most important thing now was to quickly increase his strength. Only then would Ming Yu have the ability to defeat the Nether Master and steal his heart from Ming Xuan's hands!

Grasping the River Styx Sword and comprehending the sword style within it was the best way to increase one's strength!

"Swish!"

Ming Yu's mind stirred and a cold light flashed within her black gold wrist guard. It was the faint cyan glow of the Netherworld Sword.

Ming Yu grasped the Netherworld Sword in his hand and felt a threatening chill come from the Netherworld Sword, causing his spirit to tremble.

Because Ming Yu had already conquered the Netherworld Sword, the Netherworld Sword was no longer resisting against Ming Yu. On the contrary, its aura blended into Ming Yu's aura, causing her to carry an ice-cold aura of death.

Ming Yu's mind slightly moved as she drew out the memories of the Netherworld Sword piercing into her brain.

The Underworld Sword Technique was a peak Superior Grade Spirit Realm martial skill. It was divided into three moves, the Underworld Chop, the Underworld Storm, and the Underworld Massacre Technique!

The power of the Underworld Chop permeated through every single strike, aiming to make the death sword aura of the Netherworld Sword more refined and condensed, causing the death sword aura of the slash to become even more terrifying and sharp.

Only by drawing out a total of one thousand five hundred sword Qis of death could he use the second move of the River Styx Sword Style: Underworld Storm.

And only by completely condensing the Sword Qi of Death and reaching 3000 paths could Ming Yu display the third move of the River Styx Sword Style: Underworld Massacre!

The power of the River Styx Slaughtering Murder had already surpassed the peak Superior Grade Spirit Realm martial skill. Even if he were to condense the three thousand streams of Death Sword Qi, it would be very difficult for him to unleash the River Styx Slaughtering Murder.

However, Ming Yu was not discouraged. Since he had pulled out the Netherworld Sword, Ming Yu would let the Netherworld Sword emit its due glory.

He naturally did not have any thoughts towards the River Styx Slaughtering Murder. Even if it was the Tempest of the Netherworld, Ming Yu would not dabble in it for the time being. What he needed to do now was to completely familiarize himself with the Underworld Chop.

The Underworld Chop was actually a sword move that focused the Sword Qi of Death to the extreme. Because the Sword Qi carried an extreme killing intent, it was called the Underworld Chop.

As the saying goes, there was no path to survival under the Yellow Springs Sword. Wherever the sword glow passed by, that was referring to the Underworld Chop!

If there was not much Sword Qi condensed from the Death Sword Qi, then the power of the Underworld Chop would not be strong. However, if there was enough Sword Qi condensed from the Death Sword Qi, then the power of the Underworld Chop would increase exponentially!

In order to practice the Underworld Chop, Ming Yu had already entered into a cultivation state for days and nights. As a powerful martial artist, he could absorb the surrounding heaven and earth origin energy to recover his strength.

Therefore, in this cave, Ming Yu didn't need any food.

Ming Yu continued to practice her sword arts in the cave, constantly slashing out with the Netherworld Sword, slashing out with 30,000 sword strikes every day!

This sort of tempering was boring, but Ming Yu had a tenacious perseverance and his perception was extremely high. After five days, he was able to condense 1200 sword energies. At this time, Ming Yu's Netherworld Sword had already improved.

It was just that the amount of sword qi was too great, causing Ming Yu to have difficulty superimposing it, so in the end, it became more difficult to condense it. Wanting to condense one thousand and five hundred sword qi was many times more difficult than the previous five days!