The sky outside the tower was hung with a bright moon, illuminating the entire Lightning City, and even the steam spewed out from the pipe racks inside the city could be seen clearly, although it illuminated the road, but it was not conducive to hiding, and around the moon were thunderclouds that never stopped, constantly churning, and those moonlights were like a breakthrough to disperse these thunderclouds, and those thunderclouds were also fighting against the moonlight that dispersed them.

Li Yiheng remembered the route from here to Cheng Dong's house very clearly, but since it was curfew time, the sound of patrols driving thunder trucks could be heard on the street from time to time, and Li Yiheng didn't have to think about it to know that the domain king must have sent additional people to patrol the city to search for Li Yiheng.

However, there are many people from the Langyu Wang faction, and it is impossible to spread all over every place in Lightning City, and Li Yiheng quickly came to the back door of Cheng Dong's house along the pipeline.

"Knock, knock" The knock on the door at intervals of three times is the code agreed upon by Cheng Dong and Li Yiheng, Li Yiheng thinks that Cheng Dong must be very angry now, he is going out for a walk in the morning, so he caused such a big mess, and it will be too unreasonable to ask Cheng Dong for help now.

The iron door opened a small crack with a "creak", Cheng Dong's vigilant eyes appeared in the dim light behind the crack in the door, saw Li Yiheng, hurriedly opened the door, and dragged Li Yiheng in.

"Why did you provoke the domain king so quickly, and that Chen Hu, don't talk about saving your companions now, you can't escape yourself. After Chen Hu gently closed the iron door, he directly threw a sentence at Li Yiheng.

Li Yiheng was not angry, pulled Cheng Dong's sleeve and said, "I need you to help me rescue Diana and Tianhong." ”

"Don't dream, I already took a big risk when I let you out, and I still expect you to help me, now that the domain king has personally stepped out, I won't go on this trip again." Cheng Dong said that he was about to let go of Li Yiheng's hand holding his sleeve, and the more he pulled, the tighter Li Yiheng pulled.

Li Yiheng directly pushed Cheng Dong against the wall, put his right hand against Cheng Dong's chest, and lowered his voice: "Don't think you can run away from the things you did before, if I hand you over to the citygoers of those people you killed, what do you think?"

"Are you really threatening me?" Cheng Dong said coldly.

"What do you think?"

Xiao Ji looked at the strange posture of the two of them in wonder, and couldn't understand that the two were still benefactors-like friendship before, but now they are falling apart.

Li Yiheng saw Cheng Dong's hesitation, so he let go of his hand and continued: "Also, I also know the secret of your transformation of people. ”

At this time, Cheng Dong looked at Li Yiheng even more incredulously, and then reluctantly pretended to laugh: "How can you know that you don't choose a better reason to fool me." ”

"That fragrance", Li Yiheng immediately picked up, leaving no room for Cheng Dong to think, "The secret is those dark blue slime in front of your door, and all the transformed people have this fragrance on their bodies, including Chen Hu." ”

Li Yiheng said very resolutely, without a trace of doubt.

Cheng Dong silently lowered his head, indicating that he had admitted what Li Yiheng said, and Li Yiheng continued to attack more confidently when he saw this: "Those are not ordinary wastes, they are some kind of energy body, right? ”

Li Yiheng's words were in the middle of Cheng Dong's key point, Cheng Dong looked at Li Yiheng with admiration, and his eyes returned to their previous sharpness: "Yes, that kind of slime is only in front of my house, people have always thought that it is the waste of the factory, and I found the subtlety of it, those slime are endless, and they are inexhaustible, so I simply leave them outside, and the most dangerous place seems to be the safest place." ”

"So, if you don't want this secret to leak out, please help me get out of Diana. ”

"I'm not mistaken, you're the best of the other, I'll help you once, but I have a quid pro quo. Cheng Dong smiled, and the wrinkles on his face were pulled backwards.

"On what terms?"

"Help me find out where that slime is coming from!"

Li Yiheng originally thought that he would exchange his right arm, but when he heard Cheng Dong say this, he took a long breath.

"Deal!"

Cheng Dong said as he put on his oil-stained white coat, walked to his experimental room, turned around and said in a low voice, "Follow me!"

Li Yiheng followed Cheng Dong into the experimental room, the room was surprisingly neat, and all kinds of instruments and tools were placed in an orderly manner, which was completely different from the one Li Yiheng was brought to before.

However, Li Yiheng didn't have time to care about these now, he saw Cheng Dong press down on the right wall, a palm-sized square box popped out of the wall, Cheng Dong pulled a lever embedded in the box on the back of the box, and the mechanical platform in the middle of the house opened from both sides, leaking out a ladder in the same direction underground.

Cheng Dong didn't say a word, Li Yiheng was also silent, only Xiao Ji felt that the current atmosphere was very embarrassing, and he hesitated to press back when he wanted to speak out several times.

Li Yiheng followed Cheng Dong into the elevator, the elevator slowly fell, surrounded by fluorescent stone walls, so it was clear that those fluorescences were made of transparent materials like skulls, and it could be seen that there was an electric current connected inside.

The elevator went down about fifty meters before stopping, and at the door of the elevator was a thunderbolt truck that looked like a brown bear lying on its stomach, but the carriage could only accommodate two people, and there were straps fixed on both sides of the carriage.

"This is the tool you used as a Lelith, right?" Li Yiheng asked coldly.

"That's all in the past, now I'm only doing animal modifications, people, and there are no challenges, such as the juxtaposition you saw before. Cheng Dong said as he got into the thunder car, and Li Yiheng and Xiao Ji sat in the back seat, deliberately avoiding those straps.

Speaking of merging, Li Yiheng is still a little scared, being able to create such a monster can be seen, Cheng Dong's transformation technology can be seen.

The thunder loader started, surprisingly no noise, quiet like a swimming fish.

"Where are we going now?" Li Yiheng finally couldn't help but asked first.

"Just keep up!"

The thunder loading truck quickly galloped along the winding iron frame, and there were rows of lights in the shape of various animal heads embedded in the uneven stone walls on both sides of the iron frame, some even had strange three-headed hyenas, some had no facial features, and their faces had inward-concave crosses, I don't know what kind of species, and there were strange tunes everywhere.

In the end, the thunder loading truck stopped in front of a tiger-shaped skull lamp the size of a buffalo, Cheng Dong was just about to get out of the car, but saw the skull light on the top swayed a few times, Li Yiheng watched it cautiously, and the skull light shook for a while and then quieted down.

The corners of the tiger-shaped skull are carved outwards with two iron snakes that bend upwards around the corners of the eyes, and then detour from behind the ears, revealing only two small heads, and through the bright light, you can even see the snake hyacinth spit out by the two snakes.

"Such a big project cannot be completed by one person. Li Yiheng looked at the tunnel in front of him that could not extend to the end.

Cheng Dong stood under the tiger-headed skull, seemingly very satisfied with all this, with his hands on his waist, and also looked at the tunnel in front of him: "This tunnel runs through the entire Lightning City, even the Domain King doesn't know about its existence, this has taken me more than ten years." ”

"More than ten years to dig a tunnel? You're really boring, if I'm not mistaken, you can only do it with the help of the transformers, if you are a city citizen, you can't hide it for so long. Li Yiheng was convinced of his guess, and the person in front of him was still unknown, so until now Li Yiheng didn't fully believe him, and the reason why he didn't tell Cheng Dong Tower that there were children in the tower was also due to this.

"I have my own purpose, but I just need your help. Cheng Dong said, pulling the snake tail composed of two hanging chains on the jaw of the tiger-shaped skull, and the jaw of the tiger-shaped skull fell down exaggeratedly slowly, and even a long strip of stone wall on the wall also submerged into the hidden groove in the ground, forming a small door just enough for a person to lean over.

Cheng Dong had already stepped into the skull's jaw, and he didn't look back and said, "Follow me!"

Li Yiheng glanced at Xiao Ji and motioned for Xiao Ji to follow behind him, if anything happens, run away immediately, in fact, with Xiao Ji's size, it is not difficult to escape.

Xiao Ji flew to Li Yiheng's shoulder knowingly, grabbed Li Yiheng's clothes with both claws, and his big eyes cautiously watched the depths of the door.

There are no illuminated lights on the wall inside the door, but it does not affect Cheng Dong's actions, he doesn't know how many times he has walked this road, and he can feel the destination with his eyes closed, and Li Yiheng has not even figured out where this road is in the same direction.

So Li Yiheng followed Cheng Dong closely, and even Cheng Dong's breathing could be heard, Cheng Dong's panting sound was more chaotic, and his steps were vaguely unsteady, as if he was afraid of something unknown here.

Li Yiheng followed Cheng Dong for about three minutes, he had adapted to the darkness here, and he could vaguely see that the passage ahead was turning to the right, but blocking Li Yiheng from following Cheng Dong turned in, and the distance of less than one meter suddenly became no way, and a wall blocked the two of them, Li Yiheng stepped forward and touched it, and it turned out to be a little hot.

"I set this here on purpose, and I need your help to open it. Cheng Dong walked around behind Li Yiheng and waited for Li Yiheng to make a move.

Li Yiheng quickly thought about what would happen behind the wall, whether he would shoot a few dark arrows the moment he opened it, or a modified creature like Hefeng, and Cheng Dong deliberately lured him here, and a trap had already been set up here.

But Li Yiheng quickly denied the idea just now, Cheng Dongda doesn't have to be like this, he wants to get rid of himself, as long as he starts the thunder loading truck in front of him when he first comes in, with the speed of the loading truck, Li Yiheng will definitely not be able to catch up, and since it is said here that there is a quid pro quo, Cheng Dong does not need to take such a risk.

"If it weren't for me, how would you have opened this wall? and transform people?" Li Yiheng had already pressed one hand on the wall, and asked Cheng Dong sideways.

Cheng Dong held on to the wall with one hand, his breathing was even more disordered, and beads of sweat continued to ooze out of his forehead, but Li Yiheng didn't see it.

"I know and ask. Cheng Dong's voice was also a little difficult to answer.

"Where are those reformers you summoned now?" Li Yiheng couldn't help but ask curiously.