Mu Yu brought back twenty purple gold spirit stones, which came in handy. Xun Lao cleverly set up a formation within a array, and concentrated all the spirit stones needed for the Spirit Gathering Array on a purple gold spirit stone, and this purple gold spirit stone can be used for at least one year according to Xun Lao's estimate.

"I have twenty Purple Gold Spirit Stones, doesn't that mean that I can use them for several years?" Mu Yu exclaimed, he remembered that he had used up all the other Purple Gold Spirit Stones, and he was a little embarrassed.

Xun Lao replaced the spirit stone that had turned into an ordinary stone with a purple gold spirit stone, and then stood up, he worked all afternoon, and finally transformed the four formations. He said, "Let's do this now! give me a few more days, I can use two Purple Gold Spirit Stones to transform this Spirit Gathering Array, and the effect will be doubled." ”

"Then what you just said about our Luochen Mountain having a mountain protection array?" Lan Ling'er had been asking questions all afternoon, Mu Yu never knew that she was so interested in the formation.

Xun Lao thought for a while and said, "This formation of Falling Dust Mountain is very advanced, I haven't seen it before. However, I speculate that this formation is to lock the aura of the outside world on this mountain, making the aura of this mountain more mellow, similar to the Gathering Spirit Array, but much more advanced than the Gathering Spirit Array. If you can control this formation, you can even observe the every move of everyone on this mountain, you can also use this formation to prevent outsiders from invading, and you can also use this formation to attack everyone in the mountain!"

"Is it so powerful?" Mu Yu opened his mouth wide, and the master had quietly set up such a secret and powerful formation? Didn't he say that whoever is lazy in cultivation usually can't escape the master's eyes?

"Then doesn't this big array want more spirit stones?" Lan Ling'er also felt incredible, a small place costs five hundred spirit stones, and the formation of Luochen Mountain is so big, isn't it a hundred thousand?

"This formation is very strange, it's not like using a spirit stone as a formation base, but something as a formation base, it may be a magic weapon, I don't know very well. If it was the formation laid out by the master, his insight into the formation was far better than mine. Xun Lao sighed.

What kind of magic weapon can support a great array of mountain protection?

"Xun Lao, I remember that the Jiuhua Sect also has a mountain protection array, do they also have any powerful magic weapons?" When Mu Yu was about to infiltrate the Jiuhua Sect, he touched the mountain protection array, and was noticed and had to leave.

Xun Lao shook his head: "Jiuhua has sent me a few times, and that big array is just a simple vigilance formation, it is not aggressive, and it cannot gather aura. When someone doesn't get in the right way, the alarm goes off. That formation only needs a few hundred spirit stones a month, and it doesn't need too much, just like the formation of each other academy in the academy. ”

Each annex of the school has a formation, and you need to enter it in a specific way, otherwise it will make a chirping sound. The Falling Dust Sect Courtyard also has this formation, and Mu Yu and they all know how to get in.

Mu Yu wanted to continue asking something, but at this moment, Xun Lao suddenly gasped for breath, his whole body trembled, his face showed a painful look, and his hands clutched his chest.

"Xun Lao, what's wrong with you?" Mu Yu hurriedly asked.

"Kill, kill, I...... I haven't eaten, eaten, eaten for days, ......" Xun Lao fell to the ground in pain and convulsed, his eyes became red, and the joints of his body began to bulge and deform, which was a little scary.

"The soul devouring wolf in the body of the old man has an attack, go to Uncle An, he said that he has a way to suppress it!" Mu Yu said to Lan Ling'er. Lan Ling'er nodded, her figure flashed out, and she came over with Uncle An after a while.

"Uncle An, what should I do?" Mu Yu asked anxiously. He has been healing Xun Lao for the past two days, clearing him of the dark diseases in his body, Xun Lao because of the Soul Eater Wolf Demon Spirit, his body recovered quickly, but he still failed to suppress the wolf nature of the Soul Eater Wolf.

Uncle An expressionlessly took out a black grass, shook it into powder, and stuffed it into Xun Lao's mouth. Mu Yu knew that this black grass, this was called wolf poison grass, which was planted in Master's usual medicine garden, and Master would plant all kinds of herbs for them to use in baths, and everyone usually didn't care about these herbs.

"Wolf poison grass is the nemesis of wolf demon beasts, which can suppress the wolf nature of the soul devouring wolf demon spirit. The head of the family planted some, and then took one plant every seven days. Uncle An said calmly.

Xun Lao's face gradually eased, his chest slowly became stable, the red light in his eyes also dissipated, and after a long while, he sat up: "Thank you, thank you, Lord An." ”

"The head of the wolf poison grass doesn't plant much, Mu Yu you have to find a way to solve it. Uncle An glanced at Mu Yu meaningfully, Mu Yu was very uncomfortable, Uncle An said this to mean that he knew that Mu Yu had the ability to control Mu.

"I'll figure it out. Mu Yu sneered, he thought that his ability was only known to his master and senior brother, but he didn't expect that Uncle An would already know it.

Uncle An saw that Xun Lao was fine, so he turned around and left, and after walking a few steps, he stopped again, turned around and said, "Xun Lao, I agree that you stayed because you did Mu Yu a great favor, but I don't like what you did in the past, so you can do it yourself." ”

Xun Lao's face was red and white for a while, and he sighed: "I remember." ”

In fact, when Xun Lao was betrayed by the gray disciple he trusted, he already knew how ridiculous what he was doing. In order to make the gray disciples of the academy live better, he killed so many high-flying cultivators, but in the end he was betrayed. Now that Mu Yu has let him stay in the Falling Dust Sect, he has joined a sect as he wishes, what else can't he let go?

"There is another reason, Mu Yu said that you have studied the formation, so have you heard of the Dragon Seeking Formation?" asked Uncle An.

"What are you looking for?"

"What is the Dragon Seeking Array?" Lan Ling'er asked curiously.

"The Dragon-Seeking Formation is a formation that helps you find what you're looking for, including people. Xun Lao explained.

"Looking for someone, really? We're looking for someone right now!" Mu Yu said impatiently.

Xun Lao shook his head and said: "I will set up the Dragon Seeking Array, but the price is too high, I am afraid that I will not be able to collect materials, and the formation of the Dragon Seeking Array is too harsh, I don't recommend you to use the Dragon Seeking Array." ”

A formation includes a formation, a formation base, a formation eye, and a formation lead. Formation, determine the structure and size of a formation, this is not fixed; the formation eye is the core of the formation, each formation has a formation eye, controlling the effect of the entire formation, one of the methods to break the formation, and the most effective way is to destroy the formation eye; the formation base is to provide aura support for the formation, generally use the spirit stone as the formation base, you can also use some natural materials and earth treasures to make the formation base.

And the formation is not needed for all formations, and some powerful formations will be used. The formation can extend the effect of this formation beyond the formation, and manipulate a formation to act far away, for example, a person in the formation can attack someone outside the formation.

"What do you need to make a formation guide for the Dragon Hunting Array?" Mu Yu ran with Xun Lao for an afternoon, and he also knew some common sense of the formation in a daze.

"If you want to find something, you have to use the same kind of thing as a guide. Xun Lao said solemnly, "That is to say, if you want to find someone, you need someone to be the leader." The Dragon Seeking Array acts outside the array, and its range of action is determined by the quality of the array. If you want to find someone, then the person who is the leader of the formation needs to have a very strong willpower, otherwise you can only search a very narrow range, such as a radius of one mile, then it is better to find it yourself. ”

"I can be a leader. Uncle An said.

"If the Dragon Seeking Array is used to find someone, the person who is the leader of the formation is very dangerous. Once there is a slight mistake or disturbance, it will lead to the destruction of the array, that is, the person who is the leader of the array will disappear and his soul will be scattered!"

Mu Yu and Lan Ling'er's faces changed, only Uncle An was still expressionless.

"I'm willing to take the risk. Uncle An said.

Uncle An is very strict with everyone, has a strange temper, and is not close to people, but when facing the boss, he is a little like a normal person. No one knows Uncle An's past, only that Uncle An has always been obedient and respectful to the master. Since the disappearance of the boss, he has become more reticent, and he stubbornly believes that the disappearance of the boss is all his fault.

"Looking for the elderly, how sure are you?" Mu Yu asked.

"The materials of the Dragon Seeking Array are very complicated, the base of the formation cannot be a spirit stone, there must be five things. Ten thousand years of green wood, Xuanhai Chen Bing, ancient spirit from the fire, meteorite outside the sky, sunken rock and frozen soil, these five things everyone knows that they are not ordinary as soon as they hear it. The Dragon Hunting Array is said to have been created by the Five Elements Youmeng Demon Clan, so the materials are inseparable from the Five Elements Treasure. Xun Lao said.

Don't say you see these five things, Mu Yu has never even heard of it, and Wan Nian Aoki doesn't know what Mu Yu is, and there is no need to say anything else.

"How do you find these things?" Lan Ling'er didn't understand these at all.

Xun Lao shook his head and said helplessly: "I haven't seen it either." ”

Uncle An was silent for a long time, and said, "I have all the materials, you just need to help lay out the formation." ”

"What? do you have all these materials?" Xun Lao was a little incredulous, he also heard the method of finding the dragon array from ancient books, he didn't know what these materials were, but Uncle An actually said that he had them, wasn't he joking?

"You don't care, I'll get you the materials ready, and I'll come to you in two days. Uncle An finished succinctly, turned around and left the Falling Dust Cliff.

Mu Yu felt strange in his heart, Wan Nian Aoki, Xuanhai Chen Bing, Gu Ling Lihuo, Meteorite Outside the Sky, Sinking Rock and Frozen Soil, these things that seemed to be very good, how could Uncle An have it? Uncle An's origin is as mysterious as Master, everyone only knows that he is not smiling, loyal to the master, except for a bad cooking skill, he really doesn't know much.

Mu Yu helped Xun to rest, he left the room and went out with Lan Ling'er, but he was thinking about the Dragon Hunting Array in his heart. If this dragon-seeking array can help find the whereabouts of the master, he is willing to take the risk of becoming a leader. However, Uncle An definitely disagreed, he was such a stubborn person, and he would definitely go into battle himself.

"Ling'er, I didn't know you were so interested in formations!" Mu Yu said casually.

"I'm interested in you big-headed ghost!" Lan Ling'er said for no reason.

Mu Yu was scolded a little inexplicably: "Why are you not interested, why are you still running around with us in the afternoon?"

Lan Ling'er snorted: "It's not that you, a stunned young man, casually brought back a person, and asked him to join our sect, do you think we will really accept him?"

Mu Yu was stunned for a moment, he thought he had convinced everyone, but Lan Ling'er seemed to be worried about something.

"He killed so many people, and even though they were too much, they didn't lead to death. I can ignore this, I'm mainly worried about the soul eater wolf in his body. I'm not worried that he will turn into a Soul Eater wolf and attack you or me, but have you considered the emptiness and wonder of the world? They don't have any cultivation, if the old man attacks them out of control, what will the two of them do?" Lan Ling'er asked.

Mu Yu was speechless, he was indeed too reckless to do this, and he didn't take this into account. Only he knew that Xun Lao would not kill people indiscriminately even if he turned into a soul devouring wolf, and the others didn't know, they only temporarily agreed to Mu Yu's request for the sake of helping Mu Yu improve his cultivation, which did not mean that he really trusted Xun Lao.

"But I don't think the old man is a bad man, he used to be a deacon of the school, and he is a humble man, which is good. I followed you around in the afternoon just to get to know him, but I didn't expect to discover a formation that even we didn't know, he was really not simple. Lan Ling'er recognized the old man and stayed.

"Master has so many secrets in his body that he never tells us, but we have dug so much, and I don't know if he will be unhappy. Lan Ling'er continued.

"Let's make sure of Master's safety first!" Mu Yu sighed as he looked at the empty reclining chairs in the courtyard, where Master used to sit there every day with his eyes closed.