Cao Duyun stood in front of a huge stone wall with his hands in his hands.

This stone wall is five zhang high and twenty zhang wide, and is located at the end of the palace. Nine dragons are carved into the stone wall. The stone wall was originally black, and these nine dragons were all black, each with a different shape, but they all showed their teeth and claws, showing a fierce and vicious state.

Half an hour ago, when Cao Duyun waved his troops to attack under the walls of Black Dragon City, the purple-robed man on the top of the wall immediately gave up the autumn waves and flew away. Even if the Black Dragon King's martial arts are world-renowned, when he duels with Qiu Hengbo, it is impossible to deal with many masters such as Cao Duyun, Yang Jiangyi, Sima Rulan and Zhu Hong, and there is no choice but to escape.

The leader fled, and the pirates defending the city became even less motivated, and the giants and armies of officers and soldiers of the Great Rebellion swarmed up, and almost in an instant they took the city wall.

This Black Dragon City doesn't seem to be as big as expected. There were no civilians in the city, and it was completely empty except for the hundreds of pirates who had been guarding the walls.

Most of the houses in the city are also very low, showing a neat barracks-like arrangement, which is somewhat similar to the layout of the "Eagle Wing Fort" built by Hua Bushi. Only at the innermost end of the fortress was a very majestic and tall palace.

The palace is built with jet-black boulders, with a large pillar in front of the door, and three large characters engraved on the plaque: "Temple of the Sea".

After entering the city, Cao Duyun did not stop in other places in the city, and almost directly led his troops to the palace, and rushed to the front of the palace, where he was meeting Qiu Hengbo.

"Childe, Hengbo chased the Black Dragon King all the way, and he fled into the palace and disappeared. Qiu Hengbo said.

The black hair that had always covered most of his face had now been shaved off, and his exposed cheeks were as white as jade, and his appearance was three points more beautiful than that of a woman. It's just that his eyes are still as cold as ice, and people dare not look at each other.

Cao Duyun led his troops into the gate of the palace and saw this stone wall carved with nine dragons.

The space in this palace is huge, but it is empty, except for a dozen bronze lamp stands on the wall, there are no high shrines and other things in ordinary temples, and there is no furniture. The ground paved with large black stones and smooth as a mirror reflects the light of the light on the lampstand, but it makes this hall look particularly cold.

In such a hall where there is nothing else, the inner side of the Nine Dragons stone wall has become particularly conspicuous.

Cao Duyun had just stood in front of the stone wall and looked at it for a while, when Hua Bushi and Sima Rulan also arrived, and they were accompanied by Yang Jiangyi, Zhu Hong and Xiong Bailing.

Xiong Bailing was hit by the purple-robed man on the city wall, but fortunately, the opponent was suddenly attacked, and the palm power could not be fully released, and his skin was thick and hard, so he broke two ribs from the city wall, but there was no life. Xiong Bailing was brave by nature, and at this time he had already bandaged his wounds, and walked in with Sima Rulan, like a person who had nothing to do.

"This hall is supposed to be the place where the Black Dragon King usually breaks off things and gives orders, and there should be a lot of furniture and things, but now they have all been moved, but I don't know why they have to be moved, and where have they been moved?" Hua Bushi stared at the surroundings of the hall and said.

Cao Duyun said: "Those are inconsequential things. The Black Dragon King was chased by Mr. Qiu, fled into this hall and disappeared, this place is so empty, except for the gate and the front window, there is no other passage, where does Brother Hua think he fled to. ”

Hua Bushi said: "If this is the case, he must have escaped from the secret passage of the organ." ”

Cao Duyun nodded: "I think so too." ”

He immediately turned his face and shouted, "Come on, carefully search this hall and find out the secret passage of the mechanism in it!"

Hundreds of soldiers swarmed into the temple, carefully examined the walls of the hall and the floor, and repeatedly struck each black stone with the handle of a knife or a blunt object to see if it was empty behind the stone. I was busy with a pillar of incense, but I didn't find anything, and I didn't find the shadow of the secret passage.

Seeing that the soldiers had searched the entire hall, Cao Duyun's brows also furrowed. He walked around the main hall, Zuihou still stopped in front of the stone wall, and suddenly "choked", the long sword had been drawn in his hand, and the cold light flew out, and it had pierced the dragon head of one of the nine dragons carved on the stone wall.

Cao Duyun's original habit of using the "Silk Sword" has been lost in the storm outside Wanyi Island, and now the sword in his hand is called "Painted Shadow", which is a sword that Qiu Hengbo brought to him from Beijing to cut gold and cut iron, although it is not as good as the "Silk Sword" that can be bent at will, but the sharpness is still superior.

The sword was so powerful that it sparked on the wall, but it only left a small pit half an inch deep on the dragon's head. Cao Duyun put away his sword and returned, the corners of his mouth raised lightly, but he showed a light smile.

Hua Bushi said: "Brother Cao, isn't there any doubt about this dragon wall?"

Cao Duyun said: "This stone wall is extremely hard, far better than the other three walls, if I want to lay a secret passage in this hall, it will definitely be set behind this wall." ”

Qiu Hengbo said: "I checked this wall when I entered the temple, and there seems to be no hollow hole behind the wall. ”

In fact, not only Qiu Hengbo, but also the more than 100 soldiers who searched in the main hall before, and many people have knocked on the various places of this huge carved dragon stone wall, and from the sound of the sound, the back should also be solid.

Cao Duyun said: "If it is hollow within a few feet behind the stone wall, it can be detected by tapping, and the thickness of the stone slab is more than three feet, so it is not easy to identify, and if the thickness is more than five feet, even if the ear power is good, it will not be heard." This large hall is built on the mountain, and there is a secret passage five feet behind this stone wall that leads to the belly of the mountain, so that outsiders will not be able to find it. ”

This "Sea God Temple" is located at the innermost end of the Black Dragon City, behind which is the towering black stone peak on the island, and this stone wall is located on the innermost side of the main hall, and it is indeed the most reasonable to dig a secret passage into the belly of the mountain behind this wall.

Hua Bushi said: "Brother Cao is reasonable. However, if this wall is more than five feet thick, and the stone is so hard, we don't know how to open it, and it will not be easy to force it through. ”

Cao Duyun raised his eyebrows and smiled, and said, "Don't worry, since you know that there may be a secret passage hidden behind this stone wall, even if the stone wall is thick, you have your own way to deal with it." ”

He waved at the soldiers on the side and said, "Come on, blow up this wall!"

The purpose of Cao Duyun's expedition to Black Dragon Island was to eliminate the pirates, and the most important purpose was to take the countless treasures that the Dragon Palace had looted at sea for many years. He had heard early on that the treasure was hidden in a place called the "Crystal Palace", which must have been a secret cave with an ambush.

Therefore, before this trip, he had already prepared a way to break all kinds of mechanisms, and such a solid stone wall would not be difficult for him.

Cao Duyun gave an order, and immediately soldiers brought in more than a dozen large wooden barrels, all of which were filled with gunpowder. Other soldiers took sledgehammers and steel drills and began to dig holes in the Nine Dragons Wall to place gunpowder in preparation for forcibly blasting the stone walls.

Soon after, more than a dozen barrels of gunpowder had been planted. The crowd retreated into the distance, and some of the soldiers lit the fuse.

The deafening roar resounded throughout the island, and the stone chips in the "Sea God Temple" were scattered and filled with smoke, and it took a long time for the dust to gradually settle.

When Cao Duyun and Hua Bushi and the others approached again, the ground around them was already full of rubble, a messy scene, and the innermost stone wall had been blown through a row of holes, and the nine stone dragons on the wall no longer existed.

When they approached the stone wall, everyone was taken aback. Cao Duyun's expectation was right, this stone wall was indeed more than five feet thick, but behind the stone wall that was blown through, there was no imaginary secret passage leading to the belly of the mountain, but an open-air canyon.

Originally, this was the entrance to a canyon, and the "Sea Temple" was built here, and this huge stone wall carved with a dragon wall just blocked the entrance to the canyon. Now that the dragon wall has been blown through, this entrance is also revealed.

Looking into the canyon from the palace, I saw that the passage into the valley was twenty zhang wide, and on both sides were steep cliffs like knives, and the valley was filled with a lot of mist, which seemed very mysterious.

"Pass my commander's order, all teams of soldiers gather, and prepare to enter the valley!" Cao Duyun did not hesitate, and immediately passed the order.

There is a cave in the "Sea God Temple", and this canyon is most likely the entrance to the "Crystal Palace", as long as you enter it, you may get endless treasures, and Cao Duyun is already a little impatient.

He turned his head to Hua Bushi and said, "Brother Hua, you also gather the disciples of your sect, let's go into the canyon together!"

Hua Bushi pondered for a moment and said: "The entrance to the canyon here is so secret, it must be the important place of Black Dragon Island, and there are likely to be other ambushes in the valley, so it's not appropriate to rush in, why don't we wait until tomorrow after dawn to go in and explore the valley?"

Cao Duyun said: "Brother Hua is too cautious! Even if the Black Dragon King sets up an ambush, how can he help our thousands of troops? Now that most of the pirates of the 'Black Dragon Palace' have left the island, it is a great opportunity for us to wait, if we wait until tomorrow, it will inevitably have a long night and a lot of dreams, and maybe something will happen." The younger brother has made a decision, and he will definitely enter the valley tonight!"

Seeing that Hua Bushi bowed his head and was silent, obviously still disapproving of entering the valley, he turned to Sima Rulan again and asked, "Miss Lan'er, would you like to lead the crowd into the valley with us?"

Sima Rulan said: "If Mr. Hua doesn't enter the valley, Lan'er and the disciples of the 'Wanjin Hall' will also guard outside the canyon." ”

Hearing this, Cao Duyun's face sank slightly.

According to the agreement signed by the three parties earlier to jointly attack Heilong Island, all the gold and silver treasures found on the island belonged to Cao Duyun, and all kinds of seized ships, grain and grass utensils were divided equally between the "Wanjintang" and the "Evil Dog Gate". The "Crystal Palace" is a treasure cave for pirates, and the treasures found from it are all Cao Duyun's, Hua Bushi and Sima Rulan are reluctant to go, and Cao Duiyun can understand it.

It's just that without the help of "Wanjintang" and "Evil Dog Gate", Cao Duyun only took the officers and soldiers of the water division into the valley, and his combat power would be greatly weakened, and the risk would be a little greater.