The more Zhang Yu looked at these circles, the more familiar he became, and suddenly thought of representing the elevation line of the previous map on the earth, and he hurriedly said this.

"Can you still do this?" Ouyang Mu's eyes brightened the more he listened, his breathing became short, he kept studying the map with his hand, and his fingers were gesturing on it.

Seeing Ouyang Mu's serious appearance, Zhang Yu knew that he couldn't find the answer in a short time, he beckoned, asked the others not to disturb Ouyang Mu, and turned around to leave the room.

"Boss, is it good to have a name here? can't you call it the monitor lizard's lair every day?" As soon as he walked out of the door, Zhou Fat'er said with a smile.

"Oh, what do you have a good idea?" Zhang Yu thought about it, so he had a name.

"Why don't you call it Giant Mall, Golden City, Lingshi City?" Zhou Fat'er said excitedly, and the names he said were all related to money.

"Cut, it's hard to hear, how about calling it Iron Blood City?" Qiu Chengfeng glanced at Zhou Fat'er with disdain.

"Obviously, the name I chose is the best ......," Zhou Fat'er said angrily.

"Okay, stop arguing, Wang Chensheng, do you have any good suggestions?" Zhang Yu asked Wang Chensheng, who was silent. Here he has the lowest strength, and he has no skills.

In order to catch up, he cultivated desperately when he had nothing to do, and after only a month, he had vague signs of breaking through the fourth layer of qi refining, which was considered a relatively fast cultivation among ordinary people.

Seeing Zhang Yu ask himself, Wang Chensheng was slightly surprised, but he still thought about it and said: "The underground is relatively dark, if it is called Black Flame City, right?"

"Black Flame City, a good name!" unexpectedly, Lin Xie, who was holding his hand next to him, nodded.

"Since that's the case, let's call it Black Flame City!" Zhang Yu said with a smile, this place was quickly named, and Zhang Yu arranged for everyone to continue to work, after all, Black Flame City needs people everywhere.

Two days later, Ouyang Mu came to Zhang Yu excitedly, his eyes were slightly red, and he could see that he had been studying the map for the past two days, which was particularly hard.

"How is it? Have you found it?" Zhang Yu asked curiously, he had not been idle in the past two days, and he studied the transformation efficiency of the two dantian every day when he had nothing to do.

"There have been discoveries, and if I could, I thought I should organize an expedition to find the location of the river. ”

"That's no problem, but if you haven't been in Black Castle for a long time, will the sect find out?" Zhang Yu asked curiously, he didn't care about this outer disciple, but Ouyang Mu couldn't.

"I've arranged this for a long time, you can rest assured. Ouyang Mu said confidently.

"Okay, let's prepare first, and we'll leave in the next two days. Zhang Yu nodded and said. It can be seen that the Ouyang family is determined to support Zhang Yu, and even took two Lingbao bags, one for Ouyang Mu and one for Zhang Yu.

This kind of spiritual treasure bag is not popular, only inner disciples are qualified to use it, it can hold about ten cubic meters of materials, Zhang Yu and Ouyang Mu walked into the warehouse, and after filling some of the pills and food and other substances, they left.

To go on this expedition, you must be a strong person, because you have to face unknown dangers.

Qiu Chengfeng wanted to supervise the repair of Heiyan City, but he was helplessly left at home, Zhou Fat'er originally wanted to go, but was dissuaded by Zhang Yu, and finally picked and chosen, Ouyang Mu and Lin Xie participated, and the prisoners and the elite of the Ouyang family were organized into the first squad and the second squad by Zhang Yu, and these two teams selected a few people to follow.

Everyone was gathered that day to study the map, and Ouyang Mu redrew the map on the manuscript, which was clear at a glance.

"Let's look at the map, from Black Flame City all the way to this crack, about a hundred kilometers will see the dark river, this is the most dangerous place underground, because we don't know what is in the dark river, the predecessors successfully crossed the dark river, which means that we can indeed walk. Ouyang Mu said.

He sighed slightly, the manuscript was incomplete, the most important part was missing, and he still had something to say, his predecessors had indeed encountered strange creatures under the dark river, this kind of creature could make people hallucinate, and automatically enter his mouth, think about how terrifying it is to have these things happen in the dark river where you can't see your fingers.

"Everyone knows the route, and if it's okay, we'll leave immediately!" Zhang Yu said.

Everyone memorized the map, and then set off, disappearing into the darkness of the earth in a short time.

Zhang Yu and the others moved along the map, from time to time to drill into the narrow cave, through the rock cracks, the terrain under the ground is very complicated, if ordinary people come here, I am afraid it will be difficult to move an inch.

Finally got out of the cave, and then jumped up the cliff of dozens of meters, Zhang Yu asked, "How is it, have you arrived?"

"No, it's not there yet, we have to walk in through a hole in front of us, but what does this eye mean?" Ouyang Mu took out the map, and in addition to an eye, there were a few lines of obscure text on the map.

Ouyang Mu has studied these words many times, but he doesn't know what they mean?

"Come and see ......," shouted the team member who was walking in front.

Everyone ran over to take a look, and couldn't help but be stunned, only to see that under the spell of the strong light bullet, the cliff wall in front of them was densely packed with caves.

"Where the hell are we going?" Lin Xie said in amazement as he looked at the dense, pitch-black cave.

"This ......" Ouyang Mu was stunned, he lowered his head and looked at the map, and unexpectedly found that the eyes were marked here, could those dense caves be eyes?

"What should I do?" asked Lin Xie.

"I'll take a look......" Ouyang Mu asked the team members to light up the surroundings and stared at the cave himself.

Zhang Yu frowned, he switched the eyes of ghosts and gods to observe, and unexpectedly found that many caves were bubbling with a thick dead air, like chimneys emitting thick smoke. There were at least a dozen of them that did not emit black gas, and at this moment, they suddenly felt that there was movement in Jade Perry.

"I slept so well this night!" Xiao Hei's lazy voice came, Zhang Yu hurriedly looked inward, and found that Xiao Hei had changed very much, his body was made up of a small dog into a big dog, and his soul was condensed like a real dog, and even the hair could be seen clearly.

With the eyes of ghosts and gods, you can see that Xiao Hei is full of yin energy, and with normal vision, it looks like a real dog.

"What about Lin Xueyue?" Zhang Yu asked curiously.

"She's still asleep!" Xiao Hei wagged his tail at Zhang Yu flatteringly, Lin Xueyue devoured the entire ghost mother, so the sleeping time was much longer.

"Okay, don't be lazy, get up and work!" Zhang Yu said with a smile, it is most suitable for Xiao Hei to go here, Xiao Hei heard that there is work to do, and hurriedly got up, it found that it was not bad to follow Zhang Yu, and his strength cultivation has grown a lot in just a few months, and it is more effective than his cultivation for hundreds of years.

Maybe next time I can get a ghost general's ghost pill to taste, Xiao Hei's big tongue licked his mouth, and after listening to Zhang Yu's words, he appeared beside Zhang Yu.

Seeing a black dog suddenly appear next to Zhang Yu, everyone was startled, and it returned to normal in a moment, this kind of summoning is normal, there is no fuss.

Xiao Hei's body shook, separated into several clones, and quickly ran towards the group of caves. Several cultivators who could summon suddenly realized, and hurriedly summoned the summons to come out, and for a while, birds and beasts screamed.

Under Zhang Yu's command, these summons all ran quickly towards the cave.

The rest of the people all looked at it curiously, but Ouyang Mu didn't relax, kept pinching his fingers, and took out the compass and kept calculating.

Zhang Yu asked Xiao Hei's doppelganger to run into a black hole first, Zhang Yu shared his vision with the doppelganger, only to see the doppelganger trotting in, I don't know how many gaps were drilled, caves, suddenly something struck, Zhang Yu's eyes were dark.

"Oops, attacked!" suddenly someone shouted.