The three of them climbed for more than ten minutes, and finally arrived at a platform where they could stay.

Xiahoudun was the first to stand firm, looked around, and found himself standing on a large screen made of cast aluminum ventilation floor, through the ventilation holes in the floor, he could see that there were many layers under the platform. Xiahoudun took a few steps forward, leaned on the railing and looked down, only to see that this underground space is really huge, I don't know how many floors there are, countless corridors are intertwined with each other, from the platform where he is currently standing to the lowest floor, I am afraid there must be more than 100 meters. In the center of the bottom layer was a large container filled with yellow liquid, and the top of the container was higher than the current platform.

"What's this?" Xu Chu came to Xiahoudun's side, looked at the huge container and asked.

"This is the Yang Furnace," Jia Xu explained later, "it's the Extreme Yang thing we're looking for." ”

"Furnace?" Xiahoudun turned to look at Jia Xu, a little surprised.

Jia Xu's expression became much more serious than just now, he straightened the monocle slightly, and said slowly: "During the Three Kingdoms period, the nine-headed insect used the energy of the moon crystal to build a soul gathering vessel to collect souls with strong refreshing power. The motivation of the refreshed spirit depends on a person's cultivation, conduct, ability and prestige. Therefore, almost all the talented people in that era were selected by the soul gathering vessel, and after their death, their souls were collected and became fighting spirits. ”

"What does the Hydra do collecting fighting spirits for?" Xiahoudun asked.

"Let them return to the world." Jia Xu said.

Xiahoudun was very puzzled, he frowned, glanced at Xu Chu inadvertently, then looked at Jia Xu again, and asked, "Then, what is the purpose of letting the fighting spirit return to the world?" ”

Jia Xu took a deep breath, precipitated for a moment, and explained: "When these souls return to the human world, they will emit strong yang energy, and then they will be collected by the yang furnace we see now, and at the same time, the fighting soul will also create yang energy when using the Five Elements Yin and Yang Technique on weekdays, and it will be collected by it. ”

"I understand," Xiahoudun's expression gradually became solemn, "The nine-headed insect used the fighting soul to collect enough yang energy, and then destroyed the underworld gate, instantly increasing the flow rate of yin qi, in order to create the chaos it wanted. ”

"You're smart, Team Leader Xiahou." Jia Xu smiled.

Xiahou let out a long sigh and raised his voice a little, "In other words, the Spirit Record Bureau is a pawn of the nine-headed insect......"

Jia Xu didn't answer, he walked a few steps to the side, came to a staircase, turned to Xiahoudun and said, "Let's go down, there are still many things waiting for us to deal with." ”

Xiahoudun glanced at Xu Chu, Xu Chu also nodded to him, and the two followed Jia Xu and continued to walk.

The three of them finally came to the bottom of this underground space, and found that there was a roller shutter fire door more than 2 meters wide on one of the walls.

"Team Leader Xiahou, have you ever thought about such a question," Jia Xu suddenly opened his mouth, "Where are these demons hiding when they come here?" ”

Xiahoudun was already looking at the fire door and was stunned, but when he heard Jia Xu say this, he couldn't help but have a flash of inspiration in his mind, and said: "Hide under this yang furnace, and use huge yang energy to hide the demonic energy." ”

"Clever." Jia Xu said, walking towards the fire door.

Xu Chu followed Jia Xu and said, "Look at me smashing it with a hammer!" ”

When Jia Xu heard this, he hurriedly stopped Xu Chu, with a crying and laughing expression: "You also learn from the leader of Xiahou, can you use your brain." ”

"What's wrong?" Xu Chu looked disdainful, "Can't you smash it open?" ”

"Since it's a place where demons are hiding, it must not be a weapon that can be opened." Xiahoudun said.

"Look at it," Jia Xu looked at Xu Chu, "you just need to make less effort, and you will have to deal with the enemy after a while." ”

Xu Chu pursed his lips and said a little unconvinced: "I believe Brother Xuan's words." ”

"How do you open it?" Xiahoudun asked Jia Xudao.

"Of course, it's still open with the Hydra Key." Jia Xu kept searching around the fire door, and finally found a slightly recessed part on the wall on the left side of the door, and pressed it lightly with his hand, and the nine-headed insect emblem appeared on it. Jia Xu touched the emblem again, and the fire door opened.

As the fire door opened, everyone found that it was an elevator inside.

Jia Xu stepped forward and pressed the button next to the elevator door, and when he saw that the elevator door was open, he turned back to Xiahoudun and Xu Chu and said, "Let's go." ”

Xu Chu didn't think much about it, and stepped forward to get on the elevator.

"Wait," Xiahoudun hurriedly stopped Xu Chu, and then moved his gaze to Jia Xu, "I just wanted to ask, why can you use the Nine-Headed Worm Key to open their mechanism?" ”

"It seems that Team Leader Xiahou still doesn't trust me." Jia Xu responded with a helpless smile on his face.

"I think it's strange," Xiahoudun pointed to his left eye with a serious face, "I felt strange as soon as you appeared, why did you suddenly appear, and gave me this blindfold, as if you knew that we would go to a mass grave at that time." Why are you able to enter here without any hindrance, we have not encountered any enemies so far, it is not like you came here with us, but you brought us here. ”

"That's right," Jia Xu's expression also became serious, "I did go out from here." ”

"Did you originally work for demons and hydras?" Xiahoudun asked.

Jia Xu shook his head slightly, and a wry smile appeared on his face, "This was originally the secret research institute of the Spirit Record Bureau, but now it has become the base camp of the demons. ”

"What...... Is this it? Xiahoudun couldn't believe his ears.

"Otherwise, why would the Yang Furnace be in this place," Jia Xu said, "The research center of the Spirit Record Bureau that you visited before is a new site, and this is the old site. And Cheng Shangyuan, the one you investigated, was here before. ”

"I see...... I see...... "Xiahoudun muttered a few times in a low voice, and then asked, "Then what is the purpose of bringing us here?" ”

"I'm helping you complete the task, Team Leader Xiahou." Jia Xu replied.

"Accomplish what?" Xiahoudun asked.

"Of course, it's to investigate Cheng Shangyuan." Jia Xu said a little uncontrollably.

Xiahoudun thought for a moment and asked, "Isn't it investigating the nine-headed worm, how did this become Cheng Shangyuan again?" ”

"Why don't you understand!" Jia Xu raised his voice, "It was because of the discovery of the conspiracy of the nine-headed insect that Director Cheng encountered an accident, and your investigation of Director Cheng was bound to involve this conspiracy, so you were also conspired against!" Do you understand? ”

Only then did Xiahoudun react, it turned out that the cause of these things he had encountered these days was because of this.

"Oh! Oh! Xu Chu suddenly realized on the side, but he didn't know what to say, so he had to look at Xiahoudun blankly.

"Let's go!" Jia Xu opened his mouth, "Come downstairs with me, there are more things for you to understand." ”

Several people took the elevator to the deeper part of this underground space, and as soon as they got out of the elevator, a powerful demonic aura came to them. In front of me is a warehouse-like place, with a large area and many boxes piled up around it. The ventilated floor is still cast aluminum, laid out in the shape of a "hui", and there is a patio in the middle. On one side of the patio there is a staircase that connects each floor in a zigzag shape. Looking down from the patio, there are many floors below, and there are two floors above. Through the gap in the ventilation floor, you can see a bright light on the wall of the top floor, which should be an exit.

"That's really the ......case," Jia Xu took a deep breath, "The concentration of demonic qi cannot be underestimated. ”

Xiahoudun glanced back at the elevator door that had been closed, looked around at the various material packaging boxes piled up around him, and said, "Be careful, we are already in the magic barrier." ”

"Going up is the old site of the research institute," Jia Xu said, "There should be more than 20 floors going down, which used to be a place to hide laboratories and reserve supplies, and now I don't know what to do." ”

Xu Chu looked up and asked, "Is there any clue here?" ”

"Of course." Jia Xu said as he began to bend his waist, carefully checking the number on each box.

"What are you looking for?" Xu Chu asked again.

"I'm looking for this." Jia Xu said, opened a box, took out a safe from it, put it on the ground, and took out a handkerchief from his arms to wipe the safe.

"Won't we be found here?" Xiahoudun walked to the side of the patio, leaned on the railing, and looked down, "I'm afraid this is the hiding place of demons down here."

"Of course they will be discovered, and they are not stupid." Jia Xu said casually, kneeling there on one knee, constantly fiddling with the password on the safe in his hand, and muttering in his mouth, "If the password set by Ye Qiang, it should be a more auspicious number......"

"Since it's not safe, why don't you take it out and dispose of it again?" Xiahoudun walked up to Jia Xu, looked at him, and asked.

Jia Xu suddenly opened the door of the safe, took out a brown square object 20 centimeters square from it, and showed a happy smile, then turned his head to look at Xia Houdun, and said calmly: "If we leave, we won't be able to see the nine-headed worm." ”

"What's this?" Xu Chu stepped forward and asked, pointing to the cube.

Jia Xu stood up and said to the two: "This is a blood clotting box, once the box is sealed, the contents will no longer be affected by the changes in time and space, but it can only be opened with the blood of myself or my loved ones." ”

"And what's in there?" Xiahoudun asked.

Jia Xu pointed to the blood clotting box and said, "This is the box sealed by Director Cheng before his death, so naturally you have to open it to know what is inside." ”

When Xiahoudun heard this, he couldn't help but smile bitterly, "Then where do we go now to find Cheng Shangyuan's closest relatives?" ”

Jia Xu laughed, dragged Xiahoudun's hand, and used his thumb nail to cut a hole in Xiahoudun's palm, allowing a few drops of Xiahoudun's blood to drip on the blood clotting box.

Xiahoudun didn't react for a while, and stood there dumbfounded, not knowing what to say.

"What are you going to do?" Xu Chu couldn't help but shout.

"Don't worry, look." Jia Xu pointed to the blood clotting box, only to see that the box had turned into brown powder and disappeared, leaving only a tray in Jia Xu's hand, with an alarm clock and a photo on the tray.

"This ...... What's going on! Xiahoudun finally opened his mouth, he snatched the photo, and saw that it was a photo of Cheng Shangyuan and his wife, Xiahouyuan when he was a child and himself when he was a child, and then turned the photo over, and it read "With his beloved wife, Xiaowen, Xiaowu", "This...... What the hell is going on? ”

Xu Chu took the photo from Xiahoudun's hand and took a look, but he hadn't seen Xiahoudun when he was young, so he didn't know what happened, "Brother Xuan, what's wrong?" ”

"The child in this photo is when Xiahou Yuan and I were young!" Xiahoudun's mood was a little abnormal, and his speech trembled a little.

"Don't be surprised," Jia Xuyun said lightly, as if everything was under his control, "Your body was originally Cheng Wen's, but it was occupied by you Xiahoudun." ”

"What......" Xiahoudun was at a loss for a moment, and he kept thinking about everything about Cheng Shangyuan in his mind. He remembered the photo he got from Cheng Shangqian, which did not conform to the physical situation, it turned out that there should be two children in the pool of blood, that is, Cheng Wen and Cheng Wu, and these two children were selected by the fighting spirit, so others can't remember them.

"You seem to get it." Jia Xu looked at Xiahou Xuan's wandering eyes and said.

Xiahoudun suddenly remembered the "Xiaowen" that Chen Xuan shouted in his sleep, which made him understand. Xiahoudun didn't dare to continue thinking about it, although he knew that Chen Xuan was adopted by Aunt Cheng, and there was no blood relationship between Cheng Wen and Chen Xuan, but Xiahoudun still couldn't accept this reality for a while, his lips moved, and finally asked "Who is the murderer" without a word.

"Director Cheng was killed because he learned about the strangeness of the power of the extreme yang, so his two assistants are the most suspicious." Jia Xu said, "Since Ye Qiang protected Director Cheng's relics, then I think the murderer should be another ......."

At this moment, a figure suddenly appeared in front of them. The man's simple outfit, dark brown suit, gray suit pants and a turtleneck sweater that covered his neck impressed Xiahoudun deeply, even if he had only seen him once, Xiahoudun recognized him, "Hatred and admiration......"

And Qiu Daochong looked at Xiahoudun and showed his signature unnatural smile, "Hey! We meet again, number 6. ”