The eye of the formation is the central fulcrum of a formation, and it is also the source of energy for the operation of the formation, as long as the output here is cut off, the entire formation will be paralyzed. When Rong Yu found the eye of the formation, Cao Xun knew that this trapped formation had been broken.

"It's a high-grade demon beast crystal nucleus, what a waste!" Cao Xun couldn't help but exclaim as he watched Rong Yu remove a crystal crystal round crystal nucleus in his hand.

Rong Yu looked carefully at the crystal nucleus in his hand. This is a high-grade demon beast crystal nucleus, although the attributes of the crystal nucleus can no longer be seen, the entire crystal nucleus in the hand no longer has any irritable feeling, very quiet, obviously has been artificially processed.

"Senior Brother Cao, the energy of this crystal nucleus should be able to support the operation of this large array for more than twenty days, right?" Rong Yu asked Cao Xun.

Cao Xun glanced at this crystal nucleus, and replied casually: "If no one forcibly breaks the formation, it should be possible, what do you think?"

Rong Yu directly returned the crystal nucleus in his hand to the array, he kept busy working in his hand, and asked casually: "Senior Brother Cao, do you have a high-grade spar or something like that, borrow it from me." ”

Seeing Rong Yu casually carving some simple formation runes, Cao Xun was surprised to find that the entire injection was actually changing, he suddenly realized something, and casually took out two spars in his storage ring and handed them to Rong Yu and said, "Do you mean to use the formation to counter the opponent? But this is a high-level formation that can only be arranged by a human martial arts array mage, I admit that it is already quite remarkable that you can unlock it!"

Before he finished his own words, he found that the entire formation had undergone a huge change, and as a formation mage, of course he understood what Rong Yu had done.

"How did you do it!????!!

Rong Yu didn't look back, and he didn't stop carving the array in his hand, and explained in his mouth: "The so-called sleepiness is that the external auxiliary is inside, and the conduction array can be turned into protection by reversing it, remember not to depict too complex arrays, that will only backfire." ”

"Why? But that's not what our master taught, and your statement is not right!?" Cao Xun said questioningly.

Rong Yu pointed to the basic formed formation that had been transformed and said: "Your master teaches the death formation, you have to be able to use it! Look, this is called turning the text, and it is also a key step in changing the formation." ”

Rong Yu gathered his qi with one finger and quickly engraved a complex array on the two spars that Cao Xun gave him, that array was Cao Xun, who was an immortal array master, had never seen it, looking at Rong Yu's smooth and skilled seal carving, Cao Xun was completely shocked.

Previously, Rong Yu erased the formation text that connected with the formation eye, and filled in the word-keeping text that almost any second-order array mage would engrave, Cao Xun didn't feel that there was anything clever, but he was not optimistic.

Because the formation mage has a mantra called: "He stands when the formation is broken, and his own formation is broken!" It means that if you want to change the opponent's formation, you must directly erase all the opponent's formations, and only then can you use it for your own use from the new seal, otherwise the formation will collapse directly. And if you want to change your own formation, you must first strengthen it and change it, that is, break it immediately.

And Rong Yu's approach completely violated the basic principles of the formation, only slightly changed the original formation, and directly added the formation text that he called the transfer text, and the entire large array actually underwent an essential change. Cao Xun felt that there was no longer a trace of obstruction in front of him now, and he could easily enter the Xuandan Building.

Carving the formation is a very physically and energetic thing, especially the need for full attention, and the requirements for the formation mage are extremely demanding. However, Cao Xun found that Rong Yu had carved such a complex array of inscriptions, and he didn't even see the slightest tiredness. The technique is also extremely strange, those very complex formations and formations are as simple as eating and drinking in his hands, and after the effortless operation, there is not much change on his face, and he is still in good spirits. He couldn't help but stand on the spot.

"Let's go, Senior Brother Cao will lead the way! After all, you are still familiar with the road here. ”

"Oh Aoao! That's! You come with me!" Cao Xun said embarrassedly, and hurried forward to lead the way.

Xuandanlou is the output place of the entire Xuanwu Sect's pill resources, and it is the foundation of the survival of the entire sect. This is also the reason why the masters of the Xuanjin Sect in the past dynasties were all cronies of the sect master. How can a sect master who can't even master pills and spiritual weapons control the actual control of a sect? What kind of reward will a disciple of his cronies give if he has made meritorious contributions! How can a young disciple of a sect get a high-level spirit sword or spirit sword if he wants to improve? Therefore, the foundation of any sect is cultivation resources, and it is also pills and weapons, and simply put, if that sect has more alchemists and refiners, that sect can stand tall!

Under the leadership of Cao Xun, they soon found the Xuandan Building. This is a high-rise building of more than ten floors, and a circular wall-like wall similar to a city wall has been built at the outer gate of the building, on which there are many strong bows and crossbows, and many disciples in armor are patrolling back and forth. The two of them were discovered as soon as they appeared, and in an instant the guards entered a state of alert, and Rong Yu could feel that at least a dozen archers had already aimed at him, and the cold arrows were chilling.

"Disciple Cao Xun, this is the newcomer Rong Yu recommended by Elder Jiang, I want to meet you!

Someone on the parapet wall soon replied: "Oh! When I arrived, it turned out to be Senior Brother Cao who came back, and it was not a loss that the Immortal Array Master came in so easily, admire! Senior Brother Cao, wait a minute, I will send someone to open the door for you!" The voice of the person who answered was very loud, with a tone of surprise in his voice, obviously very happy about their arrival.

"Squeak, squeak!" Two heavy iron doors sounded, and the huge door was pushed open by several disciples left and right, revealing a narrow passage leading inside.

Rong Yu followed Cao Xun into the passage, and walked quickly to the Xuandan Building, a familiar Dan incense came, which made people feel relaxed and happy in an instant, Rong Yu was not a layman, and secretly praised: "Sure enough, it is the holy land of alchemy, even the air is floating with the best Dan incense, envy!"

"It seems that Senior Brother Rong also knows a lot about alchemy, and he can even know the grade of the elixir by virtue of the fragrance, and he is indeed a god!" Cao Xun praised without being surprised, but now he felt that if Rong Yu didn't know how to do alchemy, it would be a very impossible thing.

Rong Yu could hear Cao Xun's praise and hurriedly said politely: "Senior Brother Cao praised it falsely! I just know a little bit about alchemy!"