Chapter 1740: Nine Extreme Sword Advancement

"Okay, okay, Master Mao is magnanimous and won't argue with this girl."

Heifeng nodded and said nothing more. He didn't want to be driven out. He had heard of the Fengbo Hammer Method a long time ago, but it was one of the top body refining methods in the fairy world.

But unfortunately, he had never seen anyone use it.

Now he finally got a chance to see it, so he naturally didn't want to miss it.

Murong Xian glared at Heifeng and said nothing more. She knew Yun Yi could refine weapons, but she had never seen him refine immortal weapons with her own eyes, and she was a little curious.

So, this time she also wanted to stay and watch Yun Yi refine weapons.

"You can watch from the side, but don't make any noise, otherwise, don't blame me for turning hostile."

Yun Yi didn't drive them out. Heifeng didn't need to be mentioned. Murong Xian was also a trustworthy person, so it wouldn't hurt to let them see it.

However, what he refined this time was the Nine Extreme Sword.

This is his natal battle weapon. During the refining process, there must not be any mistakes, otherwise, the Nine Extreme Sword may be completely destroyed.

You know, natal battle weapons are very rare in the fairy world, especially like Yun Yi's Nine Extreme Sword, which has the opportunity to be promoted to a fairy weapon.

Although the newly obtained fairy weapon is of high grade, it is impossible to fully exert its power after getting it.

In order to use it with ease and like an arm and finger, it must be nurtured for a long time and communicate with it constantly.

The natal battle weapon is different. It has formed a strong tacit understanding with its master after a long period of running-in.

Even if the grade is upgraded, it will not affect the connection between them, saving a lot of time, and after the upgrade, it can exert its maximum power.

This is the true value of the natal battle weapon.

Once Yun Yi is affected in the refining process, resulting in problems, it will directly affect the integrity of the Nine Extreme Sword, and he will regret it too late.

"Don't worry, Master Mao knows what to do."

Heifeng nodded. Even if Yun Yi didn't say anything, he wouldn't bother Yun Yi. But at the end, he still glanced at Murong Xian provocatively.

"Hmph!"

Murong Xian also knew the seriousness of the matter, so she just snorted coldly, glared at Heifeng fiercely, and turned her head to the side, no longer looking at him.

She was afraid that if she continued to look at him, she would bite him to death.

It was so fucking infuriating.

"Yeah!"

Yun Yi nodded, and didn't pay any more attention to them. He directly took out some ore to improve the quality of the Nine Extreme Sword.

This time it was not as easy as before. After all, when the Nine Extreme Sword was in the lower realm, it had already melted a fragment of an immortal weapon and had the potential to be promoted to an immortal weapon.

So, as long as it was refined a little, it could be advanced.

Now, some of its materials can no longer support its promotion to a heavenly immortal weapon, so before refining, some better materials must be integrated into it.

Then use the wind wave hammer method to squeeze out those poor materials.

This process is equivalent to pulling out the tendons and peeling the skin, and reborn, so there must be no mistakes in the refining process, otherwise, it will cause irreparable damage to the Nine Extreme Sword.

So he must be very careful.

Swish!

A ball of red lotus fire appeared and wrapped up the Nine Extreme Sword, and began to forge the Nine Extreme Sword, and swept away the formation engraved on it.

Then Yun Yi smelted those high-level ores and carefully integrated them into the Nine Extreme Sword.

Then there was boring and rhythmic knocking, one, two, three times...

Half a day later, Yun Yi had tempered the Nine Extreme Sword thousands of times, and its shape became more and more perfect. The impurities and many low-level materials in it were all replaced.

After completing this step, Yun Yi breathed a sigh of relief, because the most difficult level had been safely passed, and there was no difficulty next.

Just refine it step by step.

However, Yun Yi still had no intention of stopping. He continued to swing the Thunder Hammer to temper the Nine Extreme Sword until he finished the ten thousand tempers and the sword body trembled violently before stopping.

Next, he began to engrave the formation.

With the previous experience, he spent another three hours to engrave ninety-nine and eighty-one formations on the Nine Extreme Sword, the same as the one left in the Jiyang Xianzong before, but more perfect.

Ang!

Suddenly, the sword body began to vibrate, and bursts of dragon roars came to his ears, and then a dragon shadow emerged from it, becoming more real.

Yun Yi knew that it was almost done, and the red lotus fire below shook violently, and the fire was raging, and the formation was engraved on the sword body in an instant.

But this time, the dragon shadow did not disappear, but formed a dragon-shaped pattern, which remained on the sword body of the Nine Extreme Sword together with those formations.

Buzz!

The next moment, the Jiuji Sword began to tremble, and a colorful glow suddenly bloomed on it, and a dragon shadow swam, and its grade was directly upgraded to the level of a heavenly fairy weapon.

Then, the colorful glow and dragon shadow faded, revealing the original appearance of the sword.

A dragon-shaped pattern ran across the sword, and the hilt was completely composed of a golden dragon, opening its mouth and biting the sword. At the junction, there was a round bead trembling slightly.

Huh!

Only after seeing this scene did Yun Yi let out a long sigh. Looking at the Nine Extreme Sword that had advanced to the Heaven Grade Immortal Weapon level, his eyes were full of excitement.

As soon as he stretched out his hand, the Nine Extreme Sword came into his hand.

At this time, the appearance of the Nine Extreme Sword had changed greatly, but it looked smoother than before, and the sword body was sharper, and a sense of sharpness could be felt from a distance.

Yun Yi waved the Nine Extreme Sword a few more times, and the dragon ball at the dragon's mouth immediately rolled up and made a sound like a dragon's roar, which actually had the effect of shocking others' minds.

"The Wind and Wave Hammer Method is indeed worthy of its reputation!"

Hei Feng on the side couldn't help but sigh. He had been there during Yun Yi's process of refining the Nine Extreme Sword, so he knew that the refining materials used by Yun Yi were mostly materials for refining earth-grade immortal weapons.

But with the blessing of the Wind and Wave Hammer Method, the Nine Extreme Sword was actually pushed to the level of a Heaven Grade Immortal Weapon.

Although this Nine Extreme Sword is only of Heaven Grade, its power is no worse than that of a top Heavenly Immortal Weapon if it is fully unleashed, especially the dragon roar it emits, which has the effect of shocking the mind.

When fighting with the enemy, it can definitely have an unexpected effect.

"It's a pity that I don't have good materials, otherwise, I can upgrade the Nine Extreme Sword to the level of a top Heavenly Immortal Weapon."

Yun Yi said with some regret, after all, Heaven Grade Immortal Weapons are already very difficult to obtain in Qingyu, on the one hand because of the high difficulty of refining, and on the other hand because of the scarcity of materials.

Even for ordinary Heaven Grade Immortal Weapons, the Jiyang Immortal Sect can't produce many, let alone top Heavenly Immortal Weapons.

So Yun Yi didn't force it anymore.