Her voice was soft, but it reached everyone's minds, whether it was the people in the airship or the people riding on the spirit birds.

In the airship, a person sits in a small, specially made quiet room. After hearing Zhenzhen's command, she reached for the wall.

Soon, with his palm as the center, the substantial wall gradually turned transparent and invisible, at first there was only a small piece, and as time continued, it continued to spread around, "impregnated", and finally, the entire airship became transparent and invisible, including all the materials and personnel in the airship, including the huge airbag on the top...... All the connections to the walls of the room that came into contact with his palms were "infected". Like a giant chameleon, it becomes the same color as the sky around it.

This kind of invisibility has some similarities with Mo Yuan's water ability invisibility, both are only optical invisibility, and the spirit can still sense, but the principles are different.

The invisible airship and the spirit birds full of people flew towards the north mightily, and soon, the spirit birds gathered together gradually dispersed, and flew extremely high, even if they were occasionally found, it was only a black spot from the ground, and it was impossible to see that there were people riding on their backs.

Bidding farewell to Zhen Zhen and the others, Mo Yuan returned on a building boat and entered a city pass before dawn.

After entering the city, Xiao Yao also left alone with another group of people, since she came to Dahuazhou, she also had to go to the field to investigate the promotion of martial arts practice among minors, according to the actual situation, or "learn the scriptures", or "teach the scriptures".

And Mo Yuan was led by Xue Hai to a dungeon.

Now, the "dungeon" has become the "standard" of the Yanhuang Sword in Zisai City and the 28 cities in northern Xinjiang, and it is not unique to Yanyu Pass.

With Xue Hai's current ability, opening a dungeon is as easy as breathing.

As soon as the mind moves, the earth qi will gather and rise and fall, and the "space gap" will naturally change, and the dungeon will be as solid and reliable as a naturally formed underground karst cave.

Although each dungeon is "parasitic" in each city pass, it is distinct, and there is almost no trade and exchange of resources and materials between it and the city pass.

The "Golden Road" originally constructed by Zhao Jian's father and son became the "meridian" and "hub" connecting these dungeons, making it a closed system of its own.

In this way, the outside world can get a glimpse of some unusual signs from the abnormal flow of certain materials to the greatest extent. This system was built after Mo Yuan left, and it took less than a year to go from the initial difficulties to the current efficient and smooth operation.

Moreover, with the increasing number of "nodes" entering this system, the efficiency of the entire system is getting higher and higher.

One of the most obvious pieces of evidence is the change in the yield of the evolution fluid in Yanyuguan and Zisai City.

Initially, Yanyu Pass was only able to produce one evolution liquid per month, and Zisai City was only able to produce three, but since two months ago, Yanyu Pass has produced two evolution liquids per month, and Zisai City has produced five evolution liquids per month, and the rest of these two places has not changed compared to before.

This simple data shows that the underground city system, which now covers the entire territory of northern Xinjiang, is quietly "activating" the social order in its coverage.

As a result, Mo Yuan suddenly became alert to a danger.

Some of the information brought by Zhen Zhen let him know that Zhongdu has a unique understanding and even management of "humane qi".

Prior to this, he only placed two bronze small tripods in Zisai City and Yanyu Pass, and secretly "stole" the humane qi in them, because the amount was small and the fluctuations were not obvious, so he was naturally fooled. However, if the underground city system throughout Northern Xinjiang gradually activates the humane qi within Northern Xinjiang, so that the total amount of humane qi that Northern Xinjiang can provide doubles, such an obvious anomaly will be difficult not to be discovered.

Fortunately, Yanyuguan and Zisai City are the first places where the Yanhuang Sword operated, and they used the most force, and many systems were implemented in these two places first, until they were perfected and a set of effective systems were summed up, which were then extended to other cities, and the time difference was basically between two months and three months.

In other words, the other cities in northern Xinjiang happened to be on the eve of the abnormal growth of humanitarianism.

Just hold the momentum before that.

For Mo Yuan, the method is very simple, that is, you have to hurry up with time.

This is also an important reason why he rushed to Dahuazhou in a hurry.

Led by Xue Hai, he walked to an empty hall in the dungeon.

Mo Yuan took out a bronze tripod from his arms and placed it on a high platform in the center of the hall, as his spiritual power communicated with it, the bronze tripod instantly "took root", connected with the land, and the "floodgate" to absorb the humane atmosphere was also quietly opened.

But it did not immediately absorb the air of humanity.

Because on its periphery, another layer of special power, earth qi, is wrapped like a closed cover, covering it in 360 degrees without dead ends.

After confirming that the plan was feasible, Mo Yuan nodded with satisfaction and said to Xue Hai: "Let's go, go to the next place." ”

Then, the two didn't stay long, and went straight out of this dungeon and left this city pass.

The entire dungeon is covered by a layer of earth qi, if you don't enter from the correct entrance and see it with your own eyes, or dig the entire city pass to the bottom and dig dozens or even hundreds of meters, otherwise, it is impossible to find this "underground world".

In this dungeon, Mo Yuan could clearly feel a kind of vitality that was different from the outside, the people who came and went, although they were in the dimly lit underground, the look in their eyes was far better than the people on the ground, there was a flickering thing called hope.

Such a discovery made Mo Yuan happy, this was their original intention to establish the Yanhuang Sword.

The changes have taken place and are spreading throughout the northern frontier.

That's enough.

From beginning to end, neither of them showed up to communicate directly with them, coming quietly and leaving quietly.

Only a few extremely strong people guarding the key entrances and exits discovered them, and they were directly "dismissed" by Xue Hai after exchanging a few words.

Although Mo Yuan couldn't help but enjoy the reverent gaze they cast, and also knew the fact that he and even those founding elders were gradually deified, he would not stay or even indulge in this, the more so, the more he had to stay away and make the most thorough cut, so that it would be good for each other.

After leaving the city, the two quickly went deep into the wilderness, and Mo Yuan said to Xue Hai: "Uncle Xue, I'll take you." ”

Xue Hai refused: "No, I can fly." ”

"You can fly too?" Mo Yuan asked in surprise.

"yes. Xue Hai nodded and laughed, speaking of this, he was also quite proud, and explained: "Since you left, I haven't taken care of things anymore, in addition to opening up the dungeon according to the plan, I also have a lot of time, and I have plenty of time to ponder the wonder of the earth's qi, although the more I ponder, the more I feel that it is profound and mysterious, but I also have some experience." ”

Listening to Xue Hai's words, Mo Yuan nodded, using the earth qi as a ban to restrict the overflow of humane qi was one of the results that Xue Hai realized.

In this case, it seems not surprising that he once again comprehended the special method of flight through the earth qi. He didn't say anything more, and turned into a goshawk in the form of flowing water and flew into the sky, looking at Xue Hai, as if curious about what he was doing.

I saw Xue Hai squatting slightly, and the whole person followed closely behind, taking off into the air.

He was like a cannonball out of the air.

When he just jumped up, his speed was faster than Mo Yuan's full speed flight, even if Mo Yuan chased after him with all his strength.

Then, his speed began to decrease continuously, and his figure also drew an oblique parabolic trajectory in the sky, reaching the apex, and then falling downward, Mo Yuan's figure flying at full speed finally caught up, and even slightly exceeded, and needed to slow down some speed and wait for him.

When he approached a height of more than ten or twenty meters from the ground, he once again made a hard push, between his feet and the earth, as if there were two invisible springs connected, after he was ready to kick hard, his body, as at the beginning, again like a discharged cannonball, diagonally shot into the air, the speed again reached a certain limit, almost close to the speed of sound, and then slowly descended, the body reached the highest apex, and then fell diagonally, the speed slowed down further, and again reached a height of more than ten or twenty meters from the ground, and once again kicked the ground, again like a rifled cannonball...... And so on and so forth.

On average, the speed was not much slower than Mo Yuan's full speed flight.

It's weird and tough, and it's a little stiff when it turns and changes direction.

At first, Mo Yuan felt very stiff in his eyes, but after a long time, he felt a different sense of rhythm. He adjusted his speed slightly, flying at a constant speed just to keep up with Xue Hai's average speed.

In their own way, the two figures chased after me in this wilderness, galloping forward.

In order to conceal and avoid additional incidents, Mo Yuan imposed an invisible water curtain around the two of them.

At their speed, it didn't take long for them to approach another city pass, which was a northern border city pass adjacent to the previous city pass.

But they did not enter, but went far away, and galloped for a while in the wilderness, and entered the next city next to them.

Under the leadership of Xue Hai, he entered the underground city of this city again, and placed a bronze small tripod in the open hall specially arranged, which was still closed and wrapped by Xue Hai with earthly qi, and then continued to the next destination without stopping.

Come quietly, go quietly.

In the next few days, Mo Yuan, under the leadership of Xue Hai, walked throughout the entire northern frontier, and almost every time he intervened in a city pass, he entered an underground city and placed a bronze small ding.

Come quietly, go quietly.

Fortunately, when he was in Daxiazhou, when he gave Zhuo Xiong and them a "special baptism", he accumulated a lot, even if he had placed some in Daxiazhou, there was still a lot of leftovers on his body, and now he finally had a place to use.

It wasn't until the twelfth bronze tripod was placed in the twelfth dungeon that he clapped his hands and said, "Okay, that's it." ”

Then, he said to Xue Hai: "Next, you just wait for my notice, you follow my instructions to withdraw the ban on these bronze small tripods one by one." ”

"Good. Xue Hai nodded in response.

Then, I couldn't help but ask, "Is this okay?"

When he had a deeper understanding of the earth's qi, he also had a better understanding of the humane qi, and once he explained the crisis brought about by Mo Yuan's mention of the "activity" of the entire dungeon system, he always felt a little unreal in his heart when he saw that it was "solved" so easily.

Mo Yuan said:

"Uncle Xue, don't worry, there are examples of Yanyuguan and Zisai City, at least it can be concluded that even if Zhongdu has some kind of 'supervision' of humane qi, it can't be specific to a certain city, and according to my own experience, it is more likely to find some clues indirectly from the increase and decrease of the total amount. It's easy to mess around a little that way, at least, for me.

According to the original situation, the entire Northern Xinjiang can provide 30 pieces of humane gas that can produce evolution liquid every month - this is an excellent quantitative standard in itself, if the amount of water in the pool decreases, it is really difficult to fool the past, but now the amount of water is increasing, then the method is too simple, just quietly pump out the extra water, so that the water level is always kept in a distant state, even if there are some slight discrepancies, it does not matter, because the humane gas comes from the entire human society, although it can be within a certain range. Shepherding and harvesting', but it is impossible to control it precisely, and even the sheep may affect the number of wool produced due to different moods, let alone humans!"

Because of the overall activation of the dungeon system, each city pass is likely to double from the "wool" of humane qi that can condense one evolution liquid per month, that is to say, the original "wool" of the entire northern Xinjiang now only needs fifteen city passes to satisfy, so Mo Yuan directly intercepted and extracted the remaining thirteen city passes plus the "wool" of Zisai City.

What's more, these increments were originally created by them, and now they take them away, so it is so natural that even "stealing" cannot be counted, no hard work, no harvest.

Yanyuguan Zisai City was originally placed in the bronze small tripod, now placed twelve more, the matter is completed.

If the Yanhuang Sword develops further in the future, the entire system becomes more "active", and the increment of humane qi increases again, then a few more bronze tripods can be placed.

Moreover, the addition of these 12 bronze tripods has also strengthened the connection between the headquarters of Qiding Space and the Northern Xinjiang Branch, from only two "contact points" in Yanyuguan and Zisaicheng to 14 contact points, which can allow more people to enter the "headquarters" at the same time.