Han Huan's speed was faster than Zhang Ruochen's, and he quickly caught up with Zhang Ruochen's side.

Zhang Ruochen said: "Even if we join forces, we will definitely not be Huo Jingcheng's opponent." I was already injured when I fought the Lord of Zhenling, maybe even worse than you. ”

"What then?"

"Run! I really can't do it, I can only fight him desperately. ”

Zhang Ruochen and Han Huan's speed was already extremely fast, but Huo Jingcheng's speed was even faster, chasing closer and closer.

"Wow!

Huo Jingcheng flew in the hurricane, and with a wave of his arm, he slashed out two more wind blades.

With the current state of the two of them, it was impossible to stop the power of the Wind Blade.

Zhang Ruochen and Han Huan rushed out to the left almost at the same time, rolling on the ground, narrowly avoiding the past.

After they escaped from the woods, a thick white mist suddenly appeared in the air, and the ground was full of ruins, broken walls, broken streets, and the bones of some humans and beasts.

"What's going on, what kind of place is this?" Zhang Ruochen said.

Han Yun was overjoyed and said, "I know! This is a ruin called 'White Mist Ancient City', which is said to be the place where the White Mist Half-Saint once lived. It's just that a long time has passed, and this place has been completely deserted. I and the disciples of the Yuntai Sect have come here to practice. I actually escaped to the 'White Mist Ancient City', and now I am saved!"

"The primary ruins may still be a certain threat to the martial artists of the Xuan Extreme Realm and the Earth Extreme Realm, but for the martial artists of the Heavenly Extreme Realm, they are not dangerous. Do you think a ruin of a ruin can stop Huo Jingcheng?" Zhang Ruochen said.

Han Yun said: "I remember that there is an underground palace in the White Mist Ancient City, which may be able to stop him. Zhang Ruochen, you come with me. ”

Huo Jingcheng chased after the two of them, and constantly struck out the wind blades, splitting the dilapidated buildings in the White Mist Ancient City into pieces.

"Get up!" Huo Jingcheng yelled.

The strong wind lifted a wide street into the air, and boulders smashed towards Zhang Ruochen and Han Huan.

Zhang Ruochen displayed the shadow of the flying dragon in the wind, as if turning into a flying dragon phantom, walking between the boulders, and easily dodged it.

"Poof!"

Han Yun didn't have the same clever figure as Zhang Ruochen, he was hit by two boulders one after another, blood spit out from his mouth, and his delicate body flew forward.

Zhang Ruochen snorted, moved sideways, caught Han Huan, held her in his arms, rolled around, and rushed straight into the gate of the underground palace.

Huo Jingcheng chased after him, and he also wanted to rush in.

"Boom!"

The stone gate of the underground palace fell from above, blocking Huo Jingcheng from the outside.

The stone gate is more than fifty meters high, and it is made of hard emery sandstone, even if it is a martial artist of the Heavenly Extreme Realm, it is not an easy task to blast the stone gate open.

"Bang bang!"

Zhang Ruochen hugged Han Huan, rolled and fell from the top of the stone staircase, and fell to the bottom of the underground palace.

Originally, Zhang Ruochen was covered in bruises, and when he fell like this, his whole body seemed to fall apart, lying on the ground, panting without moving.

It was too thrilling, just a little bit, and he was caught up by Huo Jingcheng.

Han Yun was held in Zhang Ruochen's arms and pressed on Zhang Ruochen's body, but he didn't move. Previously, she was hit in the back by two boulders and suffered severe internal injuries that she almost fainted.

She lay in Zhang Ruochen's arms, hugged Zhang Ruochen's neck with both hands, and whispered, "Thank you...... Thank you ......"

At this moment, the two are almost at zero distance, which is very charming.

Zhang Ruochen felt two soft clumps of crisp peaks pressed on his body, smelled a faint fragrance on the tip of his nose, and immediately came to his senses, touched Han Huan's back with his five fingers, gently pushed Han Huan's body, and pushed Han Huan aside.

Zhang Ruochen sat up with difficulty, took out a light attribute spirit crystal, and injected true qi into the spirit crystal.

Spirit crystals, emitting a bright light, illuminate the underground palace.

The underground palace is very vast, with a height of about 120 meters, a length of 200 meters, and a width of almost 80 meters.

On the stone wall of the palace, there are many ancient patterns carved on them, which seem to be some kind of formation.

Han Yun had already sat up, his face was a little pale, he stared at Zhang Ruochen, and said, "Thank you for saving me just now." ”

Zhang Ruochen stared at her with some curiosity and said, "Haven't you already thanked her?"

"Really?" Han Yun's face was a little hot, for fear that Zhang Ruochen would hold on to what happened just now, so he added, "I can't remember what happened just now!"

"I can't remember, forget it! Hurry up and recuperate! This underground palace has been abandoned for too long, and the defensive formation has long been useless, and relying on a stone gate alone can't stop Huo Jingcheng for long. ”

As soon as Zhang Ruochen's words were finished, a loud bang came from the direction of the stone gate, shaking the entire underground palace slightly, and falling a grain of dust.

"Boom!"

"Boom!"

......

Huo Jingcheng began to attack the stone gate, and every time he slashed out a wind blade, it would leave a deep mark on the stone gate.

Almost every second, the stone gate would be shaken.

Zhang Ruochen and Han Yu didn't dare to delay, and immediately took the healing pill, sat cross-legged on the ground, and began to heal.

An hour later, Zhang Ruochen opened his eyes, stood up, and heard a loud noise outside, and his eyes showed a deep sadness.

After an hour of recuperation, Zhang Ruochen's injuries have probably recovered, but it will take at least two days to heal.

With the defensive strength of the stone gate of the underground palace, let alone two days, it is estimated that it will not be able to stop it even for two hours.

Zhang Ruochen stared at the formation patterns on the stone wall of the underground palace, pondered for a moment, and walked over.

Han Yun also opened his eyes, saw Zhang Ruochen's actions, and asked, "What are you going to do?"

"In our current state, once the stone gate is breached, we will definitely die, and we will not even have a chance to escape. ”

Zhang Ruochen dragged his chin, stared at the lines on the stone wall, and gently stroked his fingers on the stone wall, and said: "If you can repair the formation inscription of the underground palace and open the defensive formation, then even if Huo Jingcheng's cultivation is ten times stronger, it is estimated that he will not be able to break in." ”

Han Yun shook his head and said, "It's useless, the formation here is burned by the hands of the White Mist Half-Saint, which is very profound. A formation master of the Yuntai Sect Mansion studied here for three months, but he couldn't study the formation. ”

Zhang Ruochen said: "Although I am not a master of formation, I have read a lot of advanced formation books, and I still have a little study of formation. Perhaps, some of the formation inscriptions here can be repaired. ”

Han Yun glanced at Zhang Ruochen and said, "I don't know where you got your confidence, even the formation master can't study the formation, you think you can study it thoroughly in an hour?"

"The formation masters of your Yuntai Sect Mansion are only four-rank formation mages at most. Do you think he's read the five-rank formation books, the six-rank formation books?"

"Have you seen it?" said Han Yun.

The corners of Zhang Ruochen's mouth hooked slightly, and said, "If I guess correctly, the formation inscription on the stone wall of the underground palace is a six-grade formation." ”

Array mage, in the Kunlun realm, can be said to be a quite noble profession.

A city, a sect, if it is the guardian of the formation, it is easy to be attacked by brute beasts, slaughtered by the city, and destroyed.

Therefore, every city will be equipped with a large protective array, and at least a third-grade array mage is needed to arrange the protective array.

For example, the city protection array of the royal city of Yunwu Junguo must be supervised by the four-grade formation formation in order to be successfully arranged, and the power that erupts is enough to crush the martial arts myth of the Heavenly Extreme Realm.

In the thirty-six counties of the Heavenly Demon Ridge, the four-rank array mages were already standing at the pinnacle.

As for the six-rank formation that Zhang Ruochen said just now, that was something that Han Huan couldn't even think of.

The six-rank formation book, not to mention the Yuntai Sect Mansion, even the Inner Palace Academy of the Martial City School Palace of the Heavenly Demon Martial City cannot have it.

Han Yun stared at Zhang Ruochen with some shock, and said, "The formation master of the Yuntai Sect also said that this six-rank formation has a formation inscription. Are you really proficient in formation inscriptions?"

"It's not that I'm proficient, but I've read a lot of six-rank formation books. Zhang Ruochen said solemnly.

The complexity of the six-rank formation is not at all imaginable by ordinary martial artists. If you want to explain a formation clearly, a six-rank array mage has to write at least a book as much information.

It can be said that a formation is a book.

If there is a book on the six-grade formation that circulates out, it will definitely be robbed by the formation mage. As long as they can comprehend something from it, it is enough to raise their attainments in the formation to a higher level.

However, listening to Zhang Ruochen's meaning, he seemed to have read a lot of books on the six-rank formation, so Han Yun felt quite incredible.

If Han Yun knew that Zhang Ruochen had also read a lot of seven-rank formation books and eight-rank formation books, I don't know how she would feel?

Han Yun asked, "How sure are you that you can arrange a six-grade formation?"

"Arrange a six-rank formation?"

Zhang Ruochen shook his head and said, "With my current understanding of the formation, it is impossible to arrange the six-rank formation. However, if it is only to repair this six-rank formation, there is still a certain possibility. Moreover, there is no need to completely repair it at all, even if it is only a tenth of it, it is enough to block Huo Jingcheng.

Zhang Ruochen took out an inscription pen and began to repair it according to his own understanding.

The inscriptions of the six-rank formation are quite complex, subtle, and exquisite, which is quite a test of the spiritual power of the formation mage, even if it is just a small mistake, it will cause the formation to fail to operate.

The six-rank array mage is an existence that Zhang Ruochen also needs to look up to.

Their spiritual power has reached above the fortieth level.

They can use their spiritual power to communicate with birds and animals, and they can use their spiritual power to transmit messages to people thousands of miles away.

Fixing the six-rank formation is a big challenge for Zhang Ruochen.

Zhang Ruochen didn't dare to touch those complex inscriptions easily, and could only repair some simple inscriptions, even so, he was careful and absorbed into the formation inscriptions.