The cave in front of him was more than twice as large as the previous cave with a bronze mirror mechanism. Moreover, this time there are significantly more elaborate man-made facilities in the cave. For example, the eight-sided stone tablets scattered around it, as well as the abrupt grinding plates on the ground in the middle and a Bagua-shaped altar.

Although the cave was empty, it did not look gloomy, because above the dome, which was more than two feet high, there seemed to be a large spar that emitted a pale blue light. Against the backdrop of that hazy fluorescence, the whole cave looks even more magnificent and magical.

Standing at the entrance, Bai Xiaoyi and the three of them were shocked by what they saw in front of them. They couldn't imagine who had carved a cave of this magnitude out of this underground for what reason, and they couldn't understand what kind of master could connect such a mysterious Yin-Yang secret technique with an ingenious mechanism.

Glancing at the large and small roulette wheels in the middle, Bai Xiaoyi said helplessly:

"There's no end to this, it looks like it's another set of mechanisms...... Why don't you release a few monsters for us to have a good time!"

Nodding vigorously, the fox demon girl on the side echoed in a loud voice:

"That's it! Those yin and yang magic machines, this fairy has never learned them, and he is even more lazy to think about it, so it's better to fight!"

Shaking his head with a wry smile, Ao Cangfeng strode forward and said to himself:

"I think the people who built this dungeon didn't intend to hurt the people who broke into here. These mechanisms seem to be dangerous, but in fact, they have given them enough way out. I think the master here just wants to build a cage to trap something, and these mechanisms ......" The sword-bearer boy paused slightly, and then said with some uncertainty: "These mechanisms seem to be some kind of trial, and I want to choose the destined person who can successfully crack the mechanism through them." ”

"Someone who is destined! Are you talking about me?"

Bai Xiaoyi, who was following behind, suddenly came to his senses, jumped to the front in three steps and two steps and shouted.

Still with a familiar wry smile, Ao Cangfeng said helplessly:

"I hope so, if you are the one who is destined, then this group of organs in front of you should not be able to stop you. ”

As they spoke, the three of them had already walked to the top of the stone platform in the middle of the cave. As far as the eye can see, they are on a three-foot altar built according to the direction of the eight trigrams. There was nothing on the altar, only a circle of five small bronze tripods inlaid on the stone platform.

Seeing a few delicate bronze tripods, Bai Xiaoyi immediately squatted on the ground and picked them up. But no matter how hard he tried, he couldn't shake those bronze tripods. The somewhat disappointed teenager stood up, clapped his hands and said:

"No, I can't dig out these tripods, and I don't know what they're for. ”

Leaning over on the ground, Ao Cangfeng approached the bronze tripod and sniffed it, and then said affirmatively:

"If this is an altar, then these tripods should be used for sacrifices, but if they don't smell blood, then they are not blood sacrifices. ”

The young man with the sword fell into his voice, but he heard Bai Xiaoyi beside him shouting in surprise:

"Look! there's a word on it!"

Looking in the direction he pointed, on the grinding disc not far away, a circle of neat symbols could be vaguely seen.

"Gossip, it's gossip!"

Bai Xiaoyi's eyesight is excellent, and he can see at once that what is drawn on the grinding plate is exactly the pattern of gossip.

The three of them hurriedly ran over, and after cleaning the dust on the grinding disc with their hands, a circle of clear gossip inscriptions was revealed. This circle of inscriptions is drawn around a whole grinding plate, and the surface of this grinding disc is smooth and flat, and the shape is extremely simple, which looks like a product before the Qin and Han dynasties. In addition to the gossip pattern on the outer ring, there is also a palm-sized Taiji diagram in the middle, and the carving process is extremely exquisite, and it is definitely not a grinding disc used by the folk to grind grain.

After looking around this millstone for a long time, Fox Mei'er couldn't bear it and asked:

"What is this? a table for eating?"

Frowning slightly, Ao Cangfeng said with some uncertainty:

"This thing seems to be a grinding disc, but I don't think it's right, how can there be eight grinding discs made of stone in such a heavy underground palace?"

"Wait! You say eight?"

Bai Xiaoyi suddenly realized something, and he looked around in surprise. Sure enough, as the young man with the negative sword said, around the Bagua-type altar, there were really no more, no less, there were eight stone grinding discs.

The rogue boy said with some excitement:

"You say, could this thing be the key to the mechanism?"

As he spoke, Bai Xiaoyi grabbed the edge of the grinding disc and tried to push it up. But he exerted the strength to feed, and he didn't let the huge chamber move half a minute.

It seemed that there was some truth in what the rogue boy said, and Ao Cangfeng and Fox Mei'er also joined the ranks of pushing the grinding plate. This time, with the strength of three people, the stone plate weighing at least more than 1,000 catties finally turned.

At this moment, the three of them suddenly became interested. It seems that they guessed correctly, these grinding discs are precisely the key to unlocking this cave mechanism. But now although the key has been found, it is missing a crucial link, where is the keyhole?

Stopping their respective pushes, Ao Cangfeng gasped and asked:

"Now that we know this thing can be turned, what next?"

Turning his head to look at the gossip-shaped altar in the middle, Bai Xiaoyi guessed:

"I think as long as you match the direction of the gossip on these millstones with the direction on the altar in the middle, you can open the mechanism!"

After a slight hesitation, Ao Cangfeng said with some frustration:

"But Brother Bai, now that this is underground, how can I determine the direction of the gossip? There are no stars or vegetation, and I can't even tell the direction now, let alone find the direction of the gossip. ”

Looking at the huge cavern, the three of them fell into deep thought again.

The bored fox demon girl couldn't stand this oppressive atmosphere, she stood up and walked towards the huge stone monuments on the outermost part.

As she got a little closer, the girl suddenly found that there were murals carved on the stone tablet. As if she had found a treasure, Mei'er exclaimed in surprise:

"Hey, come and see! there's a picture on it!"

Hearing the girl's shout, Bai Xiaoyi and Ao Cangfeng, who were at a loss around the edge of the grinding plate, hurried over.

Illuminated by the hedron on the top of the cave, the three of them could vaguely discern that the mural on the stele seemed to depict a picture of a natural disaster. Huge waves have flooded countless villages, and weak humans have fled in a hurry on the land. And on the huge wave, a strange face was painted with a hideous face, which looked as if the flood had turned into a monster.

In the next scene, an old man in a Taoist robe appears in the picture, holding a sword in one hand and a strange thing in a square in the other, fighting with the monster formed by the huge wave.

In the last picture, the Daoist used the square magic weapon in his hand to collect the demon, and a large number of Terran people knelt on the ground and worshiped the Taoist.

After staring at it for a long time, none of the three of them could figure out what kind of story was depicted in this mural.

Bai Xiaoyi scratched his head and said:

"It's strange, I've heard a lot of ancient myths and stories, but why haven't I heard of such one?"

Blinking their eyes, Ao Cangfeng and Fox Mei'er also shook their heads blankly.

Shrugging his shoulders helplessly, Bai Xiaoyi pointed to several other stone tablets and said:

"Why don't we take a look at the other pieces, maybe we can find clues to crack the mechanism in these murals!"

Nodding, the sword boy and the fox demon girl turned around and walked towards the other stone tablet. And Bai Xiaoyi stared at the square magic weapon in the hand of the person in the mural with some curiosity for a long time.

The thing was boxy, like an inkstone, but it was a little different. Because the mural was so small, the rogue boy couldn't make out the details of the magic weapon. After pondering for a long time, Bai Xiaoyi muttered to himself:

"That thing can't be Guang Chengzi's earth-shaking seal, right? But I've never heard of Guang Chengzi and subdued the water demon......

After struggling for a long time, the young man who was puzzled had to give up the mural in front of him and chased in the direction of the arrogant wind.