The three of them hugged and carried each other, and walked a long way to get the stone back to the entrance, but they saw Tuxing Sun lying there on his back and sleeping soundly.

Hou Zhenbang went up and touched Tuxingsun with his foot, but as soon as the monkey turned over, he fell into the well, and He Changqing quickly grabbed Tuxingsun's hind legs and dragged him back.

He Changqing lifted Tuxingsun's leg and said, "Tuxingsun, you owe me my life now." ”

Tuxingsun seemed to be frightened before, and jumped directly on Hou Zhenbang's shoulder, stroking his chest with his hand like a human.

The three of them threw all the stones they got into the square well, and with the previous stones, it was now enough for two people.

When all the stones were thrown in, the three of them felt the ground around them begin to tremble slightly, and when they looked into the well, they found that some white sand began to flow out of the holes, and the sand fell down the wall of the well on the stones below.

Wei Chi looked down and asked, "It's just sand, and it's not much." ”

He Changqing said: "Look carefully, the sand has gone back." ”

He noticed that the sand at the bottom of the well, which had been covered with stones, then faded and slid towards the edge of the bottom of the well, and soon disappeared without a trace.

Hou Zhenbang gasped: "It turned out to be ghost sand." ”

He Changqing nodded and glanced at Hou Zhenbang: "It seems that the entrance is designed by the iron-clad door." ”

The reason why He Changqing wants to say that the entrance is designed by the iron-clad door is the ghost sand that Hou Zhenbang said. In fact, it is a kind of bug, which has characteristics similar to Cordyceps, and when it is dormant, it looks like a plant, and when it is affected by external forces, it becomes a bloodthirsty bug, which can easily corrode people or animals to the point that only bones remain.

At that time, most people didn't understand what this cordyceps fungus was, so they naturally regarded it as a ghost monster, and the ironclad gate naturally didn't explain much, but said to those who had witnessed the ghost sand that they had subdued this monster.

Wei Chiran asked, "Then is it safe for us to go down now?" ”

He Changqing helped Hou Zhenbang lay down the long nails, and at the same time said: "This is a consumable mechanism, and it can be regarded as a living mechanism, mainly dealing with people or tomb robbers who want to infiltrate it, generally speaking, they will not act alone, and they are basically in groups of two, which is why they have to bear the weight of two people to activate the mechanism." ”

Only then did Wei Chiran understand what was going on, and asked again: "You said earlier that the entrance mechanism was designed by the Iron Cloak Gate, could it be that the Punishment Cave was built by the joint efforts of the entire Alien Dao?" ”

Hou Zhenbang tied the rope to the safety buckle around Wei Chiran's waist: "The torture cave was built by the joint efforts of the twelve sects of the different paths, so each layer of the mechanism in it is completely different. When it is built, it is repaired from the inside out, if the innermost layer is built by the coffin opener, and after the coffin opener is built, the dark ear will be stationed, so as to avoid the various sects knowing each other's details of the mechanism, even if you can open the mechanism designed by your own sect, you are helpless against the mechanism of other sects. ”

Although these traps can't kill everyone who enters them at once, they can also gradually consume the people who fall into them, just like the first trap, if you go down two at once, at least two will die.

The three of them slid down the rope, and when they reached the bottom, they found four closed stone doors around the bottom of the well, and each stone door was carved with four armor-clad generals.

Wei Chiran immediately said: "I know, these are the four gods, called Shen Di, Yu Lei, Qin Qiong and Yu Chi Jingde!" ”

As soon as Wei Chiran finished speaking, Hou Zhenbang smiled, and the Tuxing Sun on his shoulder also grinned.

He Changqing sighed and said: "Shameful, I don't know how to pretend to understand, what kind of door god, this is the Four Saints of the North Pole!" ”

Wei was stunned for a moment: "What are the Four Saints of the North Pole?" ”

He Changqing pointed to the four doors respectively: "Marshal Tianpeng, Marshal Tianyou, Marshal Yisheng and Marshal Zhenwu." ”

"Marshal Tianpeng?" Wei Chiran thought he had heard it wrong, "Zhu Bajie? ”

He Changqing nodded helplessly: "Yes, yes, Zhu Bajie, anyway, you can just remember it, no matter what way you use." ”

Hou Zhenbang couldn't help laughing, and then told Wei Chiran: "Look at this Marshal Tianpeng, it is recorded in the "Taishang Arctic Demon God Curse and Ghost Killing Record" - holding axes, bows and arrows, swords, duo, halberds, and ropes, fifty zhang long, black-clothed, crowned and golden-armored, and leading 360,000 divine soldiers. ”

Next, Hou Zhenbang explained to Wei Chiran the remaining three, Marshal Tianyou is in the "right of the Tongming Hall in the Miaoyou Heaven, leading the second marshal of Tiangang, and ranking the princes of the earth"; Marshal Yisheng is "the Heavenly Court is ranked, the command of the total three caves and five thunders, and the balance of the eight heavens and nine earths." ”。

He Changqing walked to the door of Marshal Zhenwu: "The people's worship of Marshal Zhenwu is much higher than that of the other three marshals, so he was later promoted to Emperor Xuanwu, almost the same as the Emperor Ziwei they guarded. ”

Wei Chi didn't dare to touch the four doors: "Then how do these doors open?" Which one is the right one? ”

He Changqing was a little distressed: "This is a little troublesome, the four saints of the North Pole are all exorcism and demon suppression, and they cannot be simply divided according to yin and yang, if you think about it alone, every door is right, and if you take a step back, every door is not right." Zhenbang, what do you think? ”

Hou Zhenbang seemed to be thinking something, and He Changqing asked a second time before he came back to his senses: "Uncle Shi, I'm thinking, first of all, I have to figure out what kind of sect this organ designs, so that I can prescribe the right medicine." ”

Wei Chiran recalled: "No matter how you look at it, it looks like the design of the iron-clad door, subduing demons and eliminating demons." ”

He Changqing looked at Hou Zhenbang and asked for his opinion.

Hou Zhenbang shook his head: "It's unlikely, it's impossible to let the Iron Cloak Gate design two continuous organs, if you talk about the same sect and the same lineage, then it can only be bone hunters, after all, they were also a group of cultivators who cultivated immortals and alchemized pills earlier." ”

He Changqing pondered for a moment and agreed: "It makes sense, but the bone hunters later gave up their original way and almost went on the evil path, but they never gave up the way of alchemy, in the final analysis, they are also the earliest batch of pharmacists." ”

Wei Chi approached the stone gate, although he didn't dare to touch it, he still used a flashlight to shine it carefully, trying to see if there was anything else on the door besides the four holy statues? When the light shone on, it seemed that there seemed to be dark lines on the door, and the dark lines seemed to be painted with clusters of flames.

Wei Chiran hurriedly told He Changqing and Hou Zhenbang about this discovery.

The two of them also approached the four doors and looked at them separately, and found that all four doors had a pattern of dark flames.

He Changqing analyzed: "Alchemy requires fire, does this door need to be opened with fire?" ”

Wei Chiran asked: "The key is that there are four doors, do we want to burn these four doors with fire?" ”

Hou Zhenbang said: "Maybe, as long as you try it one by one with fire?" ”

He Changqing agreed: "What Zhenbang said makes sense, maybe that's the case, only a door will react to fire." ”

So, Wei Chi took out the incendiary stick, opened it, and approached the first door to start the experiment, but the door did not respond.

He Changqing said: "Don't worry, there are still three doors, try them one by one." ”

When he tried the third door, the incendiary stick directly ignited the door, and the door was not only burning but also made a sound like a firecracker, and the door suddenly burst into flames.

The three of them immediately stayed away from the door, but they didn't expect that after those sparks splashed out, they actually ignited other places at the bottom of the well, seeing that the fire was getting bigger, He Changqing hurriedly pulled the rope and said, "Go!" Get on it! ”

The three of them hurriedly grabbed the rope and climbed up, and after climbing several meters, He Changqing looked down, the position they were standing in before had become a sea of fire, and if they were a little late, they would have already been burned to black charcoal.

The lieutenant let out a long breath: "It's dangerous, this mechanism actually induced us to ignite it with fire?" ”

Hou Zhenbang shook his head and said: "No, you know, the ancients couldn't think of such a thing as a flashlight, all they think about is that people must use torches to illuminate after they come down, if they want to find clues to the mechanism, they will inevitably hold a torch to look closer, and this approach will definitely ignite the underneath." ”

He Changqing said: "The second organ, if you are not careful, will cost a few lives." ”

The three of them waited for the fire below to subside, and then threw down the incendiary rod to test it, and found that it could not be ignited, and then fell.

Wei Chi looked at the burnt white stones around him and asked, "Why are these stones and stone gates set on fire?" ”

Hou Zhenbang sniffed: "There is a smell of asphalt, is it asphalt?" ”

"Impossible." He Changqing didn't think so, "Asphalt burning will become soft and deformed, you see that these stones are still the same as they were, I guess it should be oil shale." ”

Oil shale? Wei Chiran asked, "What is that?" ”

He Changqing explained: "A kind of mineral resources, there are oil shale resources in Xinjiang, China, which is a high ash content of combustible organic matter sedimentary rock, it is different from coal, the difference is that the ash content of oil shale is more than 40%, and oil shale can be obtained by low-temperature dry distillation. ”

Wei Chiran was dumbfounded when he heard this, but Hou Zhenbang next to him was not surprised.

Wei Chiran asked, "Master, take the liberty of asking, what is your academic background?" ”

He Changqing said disappreciatively: "Doctor." ”

"Huh?" Wei Chiran looked incredulous, "Doctor? ”

He Changqing was serious: "Yes, I have two doctorates. ”

Wei Chiran was so surprised that he couldn't close his mouth, and He Changqing asked rhetorically: "What?" Can't I have a PhD? ”

Wei Chiran hurriedly shook his head, then turned to Hou Zhenbang and asked, "Senior Hou, which school did you graduate from?" What major? ”

Hou Zhenbang checked the door and replied casually: "Tsinghua University Martial Arts Department Department Secret Weapons Major. ”

Does Tsinghua University have a martial arts department? How can these old men be more serious than the other.

After the three of them checked, they found four doors, and only the door of Marshal Zhenwu could be pushed. The three of them pushed it open together, and as soon as a crack appeared in the door, a stream of gas sprayed out of it, directly lifting the three people outside the door away, if Tuxing Sun hadn't grabbed Hou Zhenbang's clothes, his small body would have been blown away long ago.