The four of them had been here for a long time, and for them, how to enter the Chiyou Underground Palace had become the most difficult problem in front of them.

"In the future, if the descendants of the Xiao family have a chance......"

"If you have a chance ......"

"Serendipity......

Lu Yuan continued to silently recite the words left by Ao Xiao back then, his eyes were always full of doubts, he felt that he was close to the answer, and even as long as he took one step further, the answer would be completely found by him.

What is it exactly?

Lu Yuan thought suspiciously, his gaze kept looking at Xiao Nian.

Since Ao Xiao mentioned the descendants of the Xiao family, it proves that the method of opening the underground palace should be on Xiao Nian's body, of course, if Xiao Nian happens to be the child of the Xiao family who has an organic fate......

"Xiao Nian, stretch out your hand."

Lu Yuan shouted, and Xiao Nian stretched out his hand blankly.

I saw a flash of light on Lu Yuan's hand, and then, a long opening appeared in Xiao Nian's palm.

"Put your hand on the stone door!"

Lu Yuan plans to try it first, after such a long time, the only thing that can be inherited is the bloodline.

The Xiao family is a family bred by Ao Xiao and Chi You's daughter, so in the body of the descendants of the Xiao family, there will definitely be some Chi You's bloodline, Chi You is an ancient emperor-level figure, no matter what, his bloodline must still be very strong.

Xiao Nian didn't know what was going on, but at this moment, he could only follow Lu Yuan's instructions and put his hand on the stone gate.

After a few moments, there was still no movement.

The blood flowing from the wound on Xiao Nian's palm had even coagulated, and a bloody palm print had been left on the stone gate, but the stone gate still stood in front of them.

"It seems that it shouldn't be because of the bloodline, or rather, the Chiyou bloodline on Xiao Nian's body shouldn't be enough to open this formation......"

Lu Yuan was a little entangled, knowing that the Chiyou battle map was in front of him, as long as he opened this door, he could get the Chiyou battle map, but on the contrary, he didn't have any way.

Lu Yuan even wanted to swing down with a punch and directly smash this huge stone gate to pieces, but he knew very well that this could only be thought about, according to the solidity of this stone gate, unless it was Qin Wanqing, he would have a chance to open this huge stone gate.

"Otherwise, let's go back first, I see that the day is almost dawn, if you don't go out again, there will be a lot of people at dawn, and it will be troublesome."

At this time, Feng Wuxian also added a sentence.

"No, we don't need to go out."

Lu Yuan's eyes were full of determination, he must get the Chiyou battle map.

"Lao Feng, Brother Yu, you go up first, I have wronged you during this time, I will live in Ao Xiao's cave first, I need a quiet environment, and I should think about how to open the door of the underground palace!"

Feng Wuxian and Bai Yu glanced at each other, although the two of them are also dragons now, but they have only heard his legend about Chi You, if even Lu Yuan can't open this stone gate, they can't play any role if they stay here.

Xiao Nian was also pulled away by Feng Wuxian and Bai Yu, since his bloodline had no effect, Lu Yuan could only try to find a way to open the stone gate from elsewhere.

Looking at this incomparably towering stone gate, you can think about what a huge price it took to build such a grand underground palace with the manpower and material resources of the Jiuli Nationality back then!

The whole stone door was so smooth that there were not even any holes or eyes visible, and it was clear that the door should not have been opened with a key.

Lu Yuan finally tried to use the stupidest method, he raised his hands slightly, and then, two forces came into being from his palm, and then Lu Yuan put his palm on the stone gate fiercely!

There was no movement in the stone gate, even if Lu Yuan had turned into a dragon at this moment, and the power that was enough to destroy the mountain peak erupted from the dragon's claws, it still couldn't change any movement in this stone gate.

"It's horrible!"

Lu Yuan sighed, the Shaking Mountain Stone is a special product of the Jiuli Nationality Country, except for the Jiuli Nationality Country, all other places use basalt or flame stones that are more brittle than the Shaking Mountain Stone as the cornerstone of the city wall.

Therefore, Lu Yuan didn't have much experience in building the Shaking Mountain Stone Gate, and of course, he didn't know how to open the Stone Gate.

He started at the city gate and circled around this ancient dungeon many times.

This is a very regular ancient city construction, there are four gates, the gate is guarded high by the courtyard wall, and these walls are directly integrated with the above, from the outside, Lu Yuan can not find a second way, can enter the underground palace.

He even bombarded the city wall many times, but in front of the Shaking Mountain Stone, the power of the Saint Realm was a little unsightly.

Lu Yuan tried to tear the space apart and enter the interior directly from the space!

But when he entered the black spatial vortex, he immediately felt that the spatial laws in this vicinity were in an extremely stable state!

The so-called sage realm's teleportation through the laws of time and space is based on the fact that the laws between heaven and earth can be changed, and around this underground palace, the power of the laws is extremely stable, and even Lu Yuan has no way to change the laws of this underground palace.

He was really curious about what kind of method Chi You used to build such a huge underground palace back then, and the most important thing was that even he, a master of the Saint Realm, had no way.

Of course, Lu Yuan didn't know that when Chi You built this underground palace, there were other people who helped, but the people who helped him didn't expect that Chi You would be defeated by the Five Emperors Group.

In desperation, Lu Yuan could only leave first, he had been here for a long time, even so, he had no way to open the underground palace, it was better to go and rest first.

When I first arrived in Baoshan, it was really uncomfortable to go home empty-handed.

When Lu Yuan returned to Ao Xiao's underground palace, Bai Yu and Feng Wuxian were sitting together, Xiao Nian seemed to be tired, after all, his physical strength was far inferior to the other three, and this place was after all a place where the masters of the ancient saints lived, even if such a long time had passed, the coercion left behind was enough to make Xiao Nian, a rookie in the innate realm, a little unbearable.

Lu Yuan had no way to find a way in the Chiyou Underground Palace, so he could only put his hope in Ao Xiao's underground palace now.

He had already seen the entire underground palace of Ao Xiao, except for that painting, there was nothing else, it was obvious that when the Xiao family left, they should have taken a lot of important things with them.

Lu Yuan closed his eyes and felt it carefully, and suddenly, he opened his eyes with a hint of strangeness in his eyes.

He felt that there seemed to be a hole behind the painting.

"Patriarch, what are you going to do?"

Xiao Nian noticed Lu Yuan's movements and suddenly asked.

"It's okay, I'll take a look."

The more Lu Yuan looked at it, the more he felt that something was wrong, so he walked directly to the front of the painting, and then directly removed the painting.

The painting is still the same painting, but when it came to Lu Yuan's hands, it was completely weathered in an instant.

After all, this is just ordinary paper, and it is not easy to keep it for such a long time, and Lu Yuan's slight movement is enough to completely destroy this painting.

Lu Yuan didn't have time to pity, at this moment he only saw a map appear on the wall where the painting was originally hung!

This should be a carved map, and the color of the map is very light and light, if it weren't for Lu Yuan's careful attention, he wouldn't even be able to see that this is a map, because this map is more like a map depicted with the lines of the stone itself.

"It seems that either Ao Xiao or that Chi You's daughter should be a person who is extremely good at Danqing, otherwise he wouldn't have drawn such a detailed map......"

Lu Yuan was too familiar with this map, and just now he even walked around the scene on the map.

That's right, this is the map of the dungeon, and it's completely marked with the above ancient characters next to it.

If it weren't for Lu Yuan's cultivation now that he had reached the saint realm, he could completely rely on his spiritual power to visualize this map, but from the naked eye, he wouldn't be able to see through this map at all.

At this time, Lu Yuan's spiritual power trembled slightly.

There seems to be something marked on the location of the stone gate.

"The blood of Chiyou, earth-shattering......"

Lu Yuan silently read the words on it, and when he got to the back, the handwriting on it was already very, very small, and the most important thing was that Lu Yuan didn't know that text!

Yes, Lu Yuan didn't know what that text meant.

This also made Lu Yuan very curious, the dragon clan in ancient times had a long time, and at the same time, because they were gifted, they had endless wisdom.

In addition to his strong strength, Jin Long Ao Yuan also has a unique hobby, that is, to learn ancient characters, including the ancient human script, the ancient demon clan, and even the ancient Bai Ze clan's script, but he feels very unfamiliar with this text.

Faintly, Lu Yuan's thinking continued to diverge, it was Ao Yuan's thinking that was playing a role, because after he read it several times, finally one of the characters in this text gave Ao Yuan a little inspiration.

He began to think about it, as if he had seen this text somewhere, but no matter what, Ao Yuan couldn't remember it, as if this memory should not have appeared in Ao Yuan's mind.

Lu Yuan was also thinking, what kind of text is this? Why did that one character make him feel so familiar?

Finally, all possible scenarios kept appearing in Lu Yuan's mind, Lu Yuan's spiritual power was operating at a high level, and finally, his pupils shrank slightly, and he finally remembered where he had seen this text!

That really has nothing to do with Ao Yuan's memory, because it is completely Lu Yuan's memory!

And the place where Lu Yuan saw that text was in the Demon Venerable space!