......As soon as these blood crystals entered, everyone felt that the source stones that were sinking under the land suddenly lit up, and pieces of small formations began to take shape, the core of these small formations was these blood crystals, and when all the small formations were activated, they were connected into a huge formation, enveloping the entire Yanjing inside, at this time, Lin Xuan needed to be more careful, because once the position of the blood crystals was wrong, then the formation could not be excited.

Gradually, the sun was setting to the west again, Lin Xuan had been arranging the formation for two days, and now it had reached the final stage of arranging the formation, after all, the area of Yanjing was very large, and the span of this formation was also very large, and it took two days to be regarded as Dao Yuan's formation was very exquisite, and it would take several months for the Dao Domain's city defense array to be completed even if it was the smallest city, and it would take several years for those big cities to continuously improve.

At this time, everyone's emotions are nervous, and now it is the last moment, if this formation is really as easy to use as described before, then it will indeed help them solve their worries, their group of heavenly realms are more or less related to the dragon group, and they often run around for the country, even the three elders of the Xuanyuan tribe in this group of people are very concerned about the lives of ordinary people, after all, the elders of the Xuanyuan tribe will observe the outside world for generations, and they will often take on the tasks of the dragon group during this period of time, and there is nothing in the military merit library of the dragon group that they need, but they also spontaneously do some things, those cultivators who don't care about ordinary people generally don't join the dragon group.

So when the catastrophe came, there was a pure land to protect the ordinary people, and also let them fight outside with peace of mind, Lin Xuan asked Dao Yuan for the city protection array is also this idea, because everything will be unknown what will happen in the future, so Lin Xuan also has to be fully prepared, now Lin Xuan can only do his best and obey the destiny of heaven, he will do everything he can do, but whether he can protect ordinary people, Lin Xuan has no bottom in his heart.

After all, Lin Xuan hadn't seen those aliens, he had only fought with puppets, and he had only heard about these cultivators of foreign civilizations from Dao Yuan's mouth, but it was also an extraterritorial civilization ten thousand years ago, although ten thousand years was nothing for Heavenly Realm cultivators, but for a civilization, there would be some progress, and for so many years, they had been fighting with Dao Domain, war was a catalyst for the evolution of civilization, the progress of a peaceful civilization was very slow, but a war-torn civilization would develop very quickly。

Of course, if a civilization is unilaterally slaughtered, it is another matter, under the equal strength of the two sides, in order to promote the progress of weapons and technology on both sides, the earth is naturally proud of technology, but Lin Xuan knows that there is a scientific and technological civilization outside, although that civilization is coming to assist Lin Xuan, but Lin Xuan can be sure that the scientific and technological level of scientific and technological civilization will be much higher than that of the earth, and these civilizations will usually fight each other openly and secretly, and in their eyes, science and technology will definitely be much better than that of the earth, and then the weapons and troops of the earth may not be worth mentioning in foreign civilizations, and there will be a large area of casualties among the troops at that time。

But Lin Xuan can't manage the affairs of the army, Lin Xuan can't make weapons, neither can Dao Yuan, refining Dao Yuan is okay, but it's really embarrassing for Dao Yuan to get a hot weapon, Dao Yuan had a few high-tech weapons on his body at the beginning, but that was directly given to him by other people's science and technology civilization, and he couldn't make it himself.

However, I heard that in addition to cultivating to break through the heavenly realm during this period of time, the scholar is helping to transform weapons, and there are many weapons in the dragon group that are much higher than those installed in ordinary armies, but the materials used in those weapons are too expensive, and there is no ability to popularize, so the silver bullet that breaks through the cultivator's body defense is more expensive than a rifle, that thing is a special alloy, not a simple metal silver, this alloy dragon group cannot be mass-produced, most of the weapons of the dragon group are made of this precious and special material, and the output on the earth is very small, basically produced in parallel space, but these metal materials are very rare even in parallel space.

"......" Lin Xuan's body flashed with golden light, and there was a slight thought in his heart, at this moment, all the formations were suddenly connected, forming a large protective array that enveloped the entire Yanjing, this formation was extremely huge, and it was impossible to see the end at a glance with Lin Xuan's pressure, that is, it could be completely enveloped with the spiritual power of the Heaven Realm, so he had been closed until now, and during this period of time Lin Xuan had been using spiritual power to calculate and guide the formation.

"Buzz ......" At this moment, the source qi between heaven and earth suddenly fluctuated, as if a big mouth was swallowing the surrounding source qi, and the source qi in Yanjing City rose several grades, after a while, the huge formation lit up slightly, and then fell silent and no longer appeared, Lin Xuan is now holding an octagonal prism in his palm, this prism is the core of this formation, this octagonal prism is also specially refined by Lin Xuan for this formation, with this Yanjing's city protection array, combined with a magic weapon, after all, this formation is very comprehensive, can be attacked, defended and detected, and after Lin Xuan's upgrade, Yanjing's source gas density has increased a lotIt is very suitable for cultivators to cultivate, and it is also very suitable for the growth of animals and plants, and the environment of Yanjing will get better and better in the future.

And at this time, the other Heavenly Realm bigwigs who were watching also felt that they were restricted to a certain extent in this big array, not to mention anything else, if they forcibly observed Yan Jing, their spiritual power would be limited, which was also part of the defensive formation, and the more powerful the cultivators who were more powerful.

And if a cultivator wants to wreak havoc in Yanjing, he will be noticed by the formation for the first time and will defend and strengthen the area around the cultivator, and at the same time attack the cultivator, if he blows with all his strength, it is comparable to the power of the second grade of the Heavenly Realm, this is the horror of this formation, now no cultivator on the earth can think of breaking this formation, this is also the most powerful umbrella that Lin Xuan gave to Huaxia, there will be no second such formation, there are not so many blood crystals of the half-step Heavenly Realm Great Demon, the area of Yanjing City is not small, and there are a lot of blood crystals consumed this time, and there is no point in arranging another such formation, nuclear weapons hit on this and can't get in.

Lin Xuan let out a sigh of relief and stood up in mid-air, now Yanjing's big array has no restrictions on Lin Xuan, after all, the control center of the big array is in Lin Xuan's hands, but this control center Lin Xuan will not stay in his hands, this thing must be handed over, this control center is under Lin Xuan's design, as long as there are special techniques, even ordinary people can control it, or there is a mirror on it, it is like playing a game, when it is controlled, Yanjing will appear above the mirror like a 3D stereo map, and the control is still very simple, for those people, it is almost the same as the most advanced control system now。

Lin Xuan looked at the octagonal prism in his hand and sighed lightly, I'm afraid this thing is what those people above want the most......