The steel finally began to melt and flow, eventually turning into a fiery red liquid with incredible heat.

The scorching molten steel, although it is only at a high temperature and does not have much masculinity, the soul power is still constantly burned off layer by layer.

Fortunately, Chen Zheng's soul power is strong, the "Star and Moon Treasure Body" has already been formed, and he has the powerful ability to restore the blue sea soul, so it is not difficult to support it.

All three materials were successfully refined. Next, the most critical and difficult process is the fusion of the liquids of the three materials.

The fusion of the three liquids is not a direct mixture, it needs to be finely controlled, especially the fourth-order Snow Plains Silver Snake Beast Crystal liquid, its temperature is very low, and if one control is not good, it will turn into steam and disappear.

According to the method on the sword spectrum, Chen Zheng first put a certain amount of toner into the fourth-order Snow Plains Silver Snake Beast Crystal liquid and stirred it slowly.

Stir it upside down and stir it repeatedly until the fourth-order Snow Plains Silver Snake Beast Crystal liquid is all evenly attached to the toner.

This is completely another kind of fusion, I don't know who came up with this method, and it perfectly makes up for the shortcomings of the fourth-order Snow Plains Silver Snake Beast Crystal Liquid encountering high temperature evaporation.

Chen Zheng was breathtaking!

After mixing the two materials evenly, he exhaled deeply, and the soul power in the Mud Pill Palace poured out in large quantities, spreading the molten steel into a thin film.

Another group of soul power spread out the toner powder attached to the liquid of the fourth-order Snow Plains Silver Snake Beast Crystal and evenly sprinkled it on the molten steel film.

Then, he quickly twisted and rolled up the molten steel film, shrunk it back into a ball, and stirred it nine hundred and ninety-nine times, so that the five-hundred-year-old peach wood toner, the fourth-order snow silver snake beast crystal and the hundred-year-old refined steel were completely fused together.

Calcination over high fire causes the three materials to chemically react to form a completely new material, and then continuously purifies and condenses.

A day later, the final purification and condensation were finally completed.

At this time, Chen Zheng's soul power consumption was huge, not to mention that the martial arts pass had been running continuously for a whole day, and he was exhausted.

This is simply a big war, a fierce war, a protracted war that does not dare to relax in the slightest.

This is not only a test of the original qi and soul power control, but also a huge test of endurance, perseverance, state of mind, and so on.

Refining weapons, especially refining such high-quality weapons, is fundamentally an extreme challenge, a form of cultivation that is close to the limit, and has immeasurable benefits for the improvement of strength.

Hang on!

At this time, once you give up, you will lose all your efforts!

Although he was exhausted, Chen Zheng did not have the slightest intention of giving up, he gritted his teeth and persevered, trying his best to adjust his state to the best.

The work of the smelting, purification and condensation stage has been completed, and the next step is the forming stage of the four-grade sword. The soul power control zhì sword liquid formation is not difficult for Chen Zheng, who has many experiences.

The sword liquid was slowly elongated, and the hilt, body, blade, and tip of the sword were presented inch by inch, and the edge of the sword was released inch by inch.

"Qiang Qiang ......"

The sound of swords fighting each other sounded in the sword refining furnace, as if two great powers were fighting, and sharp sword qi burst out, cutting through the scorching breath in the sword refining furnace.

"Buzz ......"

The sword refining furnace trembled violently, as if a shocking demon weapon was about to be born, and the strong killing intent and anger spread out, rolling like a tide, making people feel cold.

These situations were all situations that Chen Zheng had not encountered when he was refining his sword before.

But he wasn't panicking, he understood that this must be the strength of the Four-Rank Sword!

There is a big difference between a fourth-grade sword and a sword below the third grade, not to mention how much difference there is in the power of the two swords, there is a fundamental difference in the refining materials alone.

However, the difference in refining materials is not the only difference, there is a very big difference between refining a fourth-grade sword and refining a third-grade sword.

This difference is the step of sword refining!

For swords below the third grade, after the shape control is successful, it can be baked. However, after refining the four-grade sword, after the form control is successful, it cannot be baked, there is still one step to be done, and this step is very important.

Without this step, the sword that was refined would not be a fourth-grade sword, but just a defective product that was slightly more advanced than a third-grade sword.

This step is the carving of the rune!

Draw runes on swords that have been formed but have not yet cooled.

Only a sword that successfully depicts the runes is a real four-rank sword.

The runes are delicate and complex, and they contain mysteries, and people who are not soul masters can't understand them at all, even if they are soul masters, their cultivation realm is low, and they are dizzy when they see it.

If you want to depict the runes, you must first be clear about the runes to be carved, so that you can have the runes in your heart and be handy in carving.

At this last step, Chen Zheng slowed down the pace and reproduced the runes that needed to be carved next in his mind, constantly tracing them.

This is a rune called a moire pattern, and it is not very complicated, at least it is much simpler than the rune on the Soul Devouring Talisman.

In the past few days, Chen Zheng has made no less than a thousand traces. It can be said that this rune is already familiar with the chest, and the soul power can depict this rune in an instant, and it is very accurate.

But Chen Zheng was still very careful, because once the portrayal was not good, or there was a deviation, even if it was a very slight deviation, it was possible to fail to refine the four-grade sword this time, or affect the quality of the Hanyun Sword.

The Cold Cloud Sword, the reason why it is called the Cold Cloud Sword, is that the cold comes from the fourth-order Snow Plains Silver Snake Beast Crystal, and the cloud comes from the cloud pattern. If the moire pattern is not depicted well, in a sense, this sword is not a cold cloud sword!

Chen Zheng quietly ran the "Soul Codex", adjusted the soul power to the best state, cut off all distracting thoughts, concentrated, and the soul power condensed a needle with the thickness of a hairpin, and began to depict the moire.

One stroke at a time, the length and depth of each stroke must be just right, not long, not short, not thick, not fine.

In the process of depiction, it is necessary to constantly burn the original gas to keep the temperature of the sword from decreasing.

A three-foot-three-inch long sword took half a day to finish.

The moment the depiction was finished, the sword body trembled, and the misty clouds and mist suddenly spread out, rolling and surging, as if there were really clouds pouring out of the sword, and the entire sword refining hall suddenly fell into the clouds and mist.

"Bang!"

The sword refining furnace exploded directly, the furnace was full of flames, and the fiery red furnace wall burst out, instantly igniting the refining hall, burning the four walls, and the smoke and dust were billowing out.

These refining furnaces were originally intended for trial disciples, but when they were originally designed, they didn't take into account that someone would use them to refine the four-grade sword, so they couldn't withstand the powerful sword qi of the four-grade Hanyun sword at all.

"Good guy!

The old man in the refining hall immediately condensed a layer of misty aura around his body, blocking the splashing tongue of fire.

This old man also made a little miscalculation, he asked Chen Zheng to help him refine the four-grade sword, just to test Chen Zheng, and by the way, he gave the refining sword spectrum of the Hanyun Sword.

But he didn't expect Chen Zheng to come to help him refine so soon, and he was about to refine successfully!

He originally thought that Chen Zheng would not be able to succeed in refining at all, and at most he would go to the step of controlling the form. However, the qiē in front of him told him that Chen Zheng had successfully portrayed the cloud pattern.

Because only by successfully depicting the cloud pattern can the power between heaven and earth be hooked and form a sword qi that rolls like clouds.

"This little guy is really more and more out of my expectations!" the old man looked at Chen Zheng, who was urging the original qi yarn to protect his body, and sighed secretly, "It's a pity that this sword refining furnace can't withstand the sword qi of the finished product of the Cold Cloud Sword, and it exploded at the last moment!

"The four-grade cold cloud sword is out!"

The next moment, Chen Zheng gave the old man a big surprise, and in the low roar, a bright sword suddenly appeared, pierced the void, and plunged straight into the ground.

The explosion of the sword refining furnace was not the first time Chen Zheng had encountered it, so he did not panic, but at the moment when the sword refining furnace exploded, he urged all his soul power to protect the finished cold cloud sword, resist the impact of the explosion of the sword refining furnace, and simulate the state of the furnace.

"Buzz ......"

The cold cloud sword trembled violently, and on the sword body that was as crystal as an ice pick, a layer of white mist spread out, like clouds and mist, and cold as snow, making that person can't help but shiver.

"Rustling ......"

Wherever the white clouds passed, the temperature plummeted, the flames went out, the walls of the fiery furnace cooled, and a fire was snuffed out in the cradle.

The entire refining hall was stained with a layer of white frost.

"It's done!" The old man's two old eyebrows almost flew out of his forehead, his face was full of incredulity, "This little guy, the first time he refined the four-grade sword, he actually succeeded! Although there is a certain amount of luck, there is no doubt about his strength!"

"It's incredible! It's incredible! This little guy is so talented!"

"I remember when I was refining the four-grade sword, I experienced more than a hundred failures! It was the first day of the Wentian Sect in ten thousand years, and the current sect master of the Wentian Sect successfully refined the four-grade sword for the first time, and it was also on the basis of a failed experience!"

"This little guy has actually succeeded once! This is simply a new record for the Heavenly Sect!"

"This kid is a genius! a real genius!"

"The last time I told those old guys about this kid, they didn't think so, this time, I'm afraid they're going to be shocked!hahahaha......"

For a while, the old man was full of emotion, and the more he thought about it, the more excited he became, even though he had gone through vicissitudes and became old and introverted, he also had an urge to hug Chen Zheng at this moment.

"Senior, this is the Four-Rank Cold Cloud Sword, please take a look!"

At this moment, Chen Zheng respectfully held the Hanyun Sword and came to the front of the old man.

"Oh!"

The old man retracted his mind, picked up the sword in Chen Zheng's hand, and nodded while looking at it, "Well! Not bad! Not bad! Although there are still some slight shortcomings, it is already considered to be of the middle grade! Very good! Very good!"

"Senior, are you satisfied?" asked Chen Zheng.

"Satisfied!satisfied!very satisfied!" the old man smiled.

Seeing the old man's satisfied expression, Chen Zheng was relieved, he promised to help refine the four-grade sword, and now he finally fulfilled his promise, "That disciple has taken his leave!"

"Don't be in a hurry! The old man shouted to Chen Zheng, raised his hand and threw the sword to Chen Zheng, and said lightly, "This sword is for you!" R1058