Only then did they remember that since this was a drainage, the wastewater generated by some of the experiments done by the Lei family in the palace must have been directly discharged into this river, and in the entire secret realm, all living beings could be said to rely on this river to survive.

No wonder, in this secret realm, all the creatures they encountered had lost their original appearance and turned into a hideous monster, and even a mouse had become so terrifying!

Thinking of this, the five of them only felt that there was great danger in the mud under their feet, and they hurriedly walked up for a distance, until the ground began to stiffen, and then they felt a little relieved.

"Wait a minute, don't go so fast. Duan Fei held a light in his hand and began to look at the stone wall of the drainage channel, and he muttered as if talking to himself: "This drainage system must also be built by a person who is proficient in Qimen Dunjia......"

"Why do you say that?" asked Li Ling.

"You see, the drain is very hidden, and if it weren't for me, I'm sure you wouldn't have been able to find it for a while. Duan Fei said very confidently.

Ye Huang and the others also had to admit this, after all, who would have thought that the drain would be in the water?

This is also where they can't figure it out, if the drain is in the water, the backflow of water is not to mention for the time being, because of the existence of water pressure, can the sewage really be discharged?

It's like a kettle with a long spout, and it's hard to pour some of the water into the spout.

"So, there was originally a formation here. Duan Fei touched the somewhat moist stone wall that was already covered with moss, he scraped the moss off the stone wall, pointed to a pattern that had existed for an unknown number of years, and said to Feng Qingyun: "Wind Path Chief, come and see, here, is it a rune mark." ”

Feng Qingyun walked over, because the light was a little dim, he directly pulled Zhang Ye over, and then the golden light in his hand looked at the stone wall. The more he looked, Feng Qingyun's face became more and more solemn, he kept scraping the moss away, and finally the entire stone wall was swept clean by Feng Qingyun and Duan Fei.

And on the stone wall, there are indeed a lot of lines that Ye Huang and Zhang Ye can't understand at all. In this kind of professional issue, there can really only be Duan Fei and Feng Qingyun who can deal with it.

After reading these lines, Feng Qingyun said: "That's right, there is indeed a formation here, but I can't understand this formation. ”

"It's normal not to understand, and I can't understand either. Duan Fei shrugged his shoulders and said.

All formations are systematic, and the rune imprints used in different systems are also different, which is equivalent to different languages, and the formation is an article that is fused and summarized in these languages, and if you want to see the formation of another system, you must first learn all the runes and imprints in the formation of this system, which requires a lot of time to ponder.

Although Wudang Mountain is the most powerful formation, and Feng Qingyun can also be said to be proficient in the formation of most systems in the world, just like people who are proficient in the eight Chinese languages, there will also be small languages that they don't know.

People are not omniscient and omnipotent, and Feng Qingyun knows this.

"But I guess there are two formations here. Duan Fei continued: "First of all, the first is to ensure the normal operation of this drainage system, so that the sewage can be smoothly discharged into the pool, and then discharged with the flowing water. ”

If a drain does not even have this function, then it loses its role as a drain, and it is a failure.

"And the second formation, it's ......" Duan Feidu paused, glanced in a certain direction in the mud and said, "Kill the formation." ”

Everyone looked towards him, and all they saw was several white bones in the mud. Most of the bones were covered in the mud, with only some parts exposed.

Seeing the white bones, Li Ling was a little scared, and the others also showed surprised expressions.

They didn't expect that so many corpses would appear in this one drain.

"Little Heavenly Master, you Dragon Tiger Mountain has the deepest research on human bones, please go and see, what are the conditions of these corpses. Duan Fei said.

Zhang Ye nodded and walked back, and after looking at the white bones a little, he said: "This corpse, which has been dead for a long time, at least a few hundred years, can be in this dark and damp environment without decaying, which shows that this corpse is at least a martial artist in the Dan Realm, or even stronger, and it is a martial artist who specializes in cultivating the flesh." ”

Zhang Ye also inspected several other corpses one by one, and without exception, they were all powerful martial artists who had been dead for hundreds of years.

There was even a corpse, not even the flesh was completely decomposed, and some flesh and blood could be seen, and the other creatures in this underground, hundreds of years had passed, and they had not eaten it. It is enough to show that this corpse is definitely a powerhouse in the transcendent realm, even if it is dead, those animals living in the crypt do not dare to approach it easily.

The transcendent realm, the Baodan realm, one powerful martial artist after another, actually died inexplicably in a sewer with sewage. It is a great shame to be buried in a filthy environment infested with snakes and rats.

These people were supposed to be famous and famous, why did they die here?

"This may have something to do with the other formation of this drain. Duan Fei said: "The person who built this drainage outlet also knows that if this palace is impregnable, then the drainage outlet is very likely to become the only breakthrough point of this palace, in order to eliminate the hidden danger of this only breakthrough point, so let the people who are proficient in the art of Qimen Dunjia set up a killing array here." ”

Duan Fei looked at the dead bones and said: "These people, presumably hundreds of years ago, like us, wanted to sneak into the palace through this drainage, and then when they entered, they were killed by the killing array, and then they were washed here by the water discharged from the palace, because the human body is also water in the end, and it is difficult to be washed into the waterhole with the current, so they are all piled up here." If I'm not mistaken, if I keep walking inside, there will still be a lot of corpses that have not been washed down. ”

This sentence made everyone present not only creepy, but sure enough, this palace is not so easy to break into it!

"That'...... Is that killing array still useful?" Li Ling asked with palpitations, glad in his heart that it was fortunate that Duan Fei was by his side at this time, if it weren't for such a person who was proficient in Qimen Dunjia, a few of them rushed in, just afraid that they would have been harmed by the killing array now, but after thinking about it, if Duan Fei was not there, they might not even be able to find the entrance.

Duan Fei shook his head and said, "What I can be sure of is that the formation that helped drain the water is still effective, and as for whether the killing formation has any effect, I don't know." ”