Nangong Feng didn't listen to him, and left with Gu Yi. When he arrived in Gu Yi's space, he let Gu Yi look at the production method of exploding ice beads, and Gu Yi didn't know if it was true. Nangong Feng had to keep it for the time being, after all, it would take until the late Yuan Shi to make the Ice Beads.

Subsequently, he discussed with Mu Ming how to find that thing, anyway, now he knows that that thing does not belong to the Zuo family in the first place, so it is better to let himself take it. Although he knew that it couldn't fit in a storage bag, he thought the Void Hall should be fine.

Mu Ming mentioned that he asked Nangong Feng to be careful of another late master of the Zuo family. Because it was obvious that the Yuan Master was not there, of course he didn't ask Zuo Ziwen, because Zuo Ziwen might not know, and even if he knew, he wouldn't necessarily tell the truth. Nangong Feng felt that it was very likely that the Yuan Master would go out to rescue the soldiers. In this regard, Mu Ming didn't say anything, just told him to be careful.

After discussing it for a while, I had an idea, and I waited. In the evening, the fighting outside stopped on time. He drove the Void Hall and began to fly back and forth within the Zuo family's formation. It took a few hours to go in and look at all the places with formations that Mu Ming had detected with his divine sense. However, the stone was not found. Especially in the caves in the back mountain, they searched very carefully, but they found nothing unusual.

He discussed with Mu Ming again, and Mu Ming suggested that he try to control the formation outside, if he can control it, it is still possible to catch the cultivator of the Zuo family, if not, then it is estimated that there will be no move. Nangong Feng asked Ximen Wan'er to observe the formation outside, but the conclusion was that this formation could not be controlled.

Then he thought, but he thought about it, and there was no way. If you want to catch Yuanshi, it's still quite simple, but if you want to hide it from other Yuan cultivators, it's not very likely. If you want to catch Yuanshi, then you don't have to think about it, after all, this place is relatively large, and it is not as simple as catching Zuo Ziwen. In addition, there are people outside the formation here, unlike those who catch Guyi, there is no one around.

Nangong Feng really needs someone to ask about the situation so that he can know where that thing is, and he also needs to know if Zuo Ziwen has played tricks in the refining method of exploding ice beads. Seeing that it was almost dawn, he found a hidden place to hide.

The men outside fought for another day, during which time they did not speak. In the evening, Nangong Feng continued to search, but he still didn't find it, and he didn't think of a way to arrest people. Soon, the sky was bright again, and Nangong Feng had to hide again helplessly. He wants to give up now, and it seems that that thing is really hard to find.

But soon, Mu Ming said, "I know what that thing is." ”

"Oh, what is it?"

"Purple Frost Stone. ”

"Purple Frost Stone?"

"Yes, it is customarily called the Purple Frost Stone, which is a stone that can constantly emit lightning, but in fact, this stone has purple frost powder in it, so it can emit lightning. If you refine the purple frost powder and add it to other weapons, you can make the weapon have a lightning attack. In fact, the pure purple frost powder is heaven-level, and it has mastered the rules of the lightning system and can send out heaven-level attacks. ”

"Heaven level?"

"Yes, if pure purple frost powder can be made into a weapon, it can be attacked using the lightning rule. It's a pity that the purple frost powder can't be made into a weapon alone, but it can be added to other heaven-level weapons, as long as the amount of purple frost powder is increased enough, it can also issue a heaven-level attack, so that the original weapon has a double heaven-level attack, which is still very powerful. Purple frost powder is also extremely valuable in my shijie. If you mix some with other levels of weapons, you can make the weapon have a lightning attack, of course, there is no heaven-level lightning attack ability. ”

"It's so powerful, if I get it, can I refine it into a weapon?"

"Not yet, wait until you reach the late stage of the Yuan Master. In addition, you don't actually need to think about adding it to other weapons, you may be able to find a heaven-level weapon, so that by adding purple frost powder, you can make a heaven-level weapon with both other and lightning systems. ”

"Hehe, I want to too, but I don't know where to find a heaven-level weapon. ”

"This is indeed the same, your Phantom Sky Fire is not good. But you can wait, wait until you have other weapons of the heaven level, and then refine this purple frost stone. ”

"Hehe, let's get the Purple Frost Stone first, you all listened to people outside?"

"No, it's just when they talked, and they mentioned that it could send lightning all the time, and a lot of people died in that mine because of it. That's why he was discovered by the ancestor of the Zuo family and taken away. They didn't know the name of the Purple Froststone, but I guessed it. The only one that can keep sending lightning and can't be put into a storage bag is the Purple Frost Stone. ”

"Keeps sending lightning, where is the source of lightning?"

"Purple frost powder without the owner's control is like this, it can automatically absorb vitality, and then send it out with lightning. Of course, the lightning should not be strong, after all, it is the lightning that comes out of itself, but the strength of the lightning is also related to the size of the purple frost stone and the concentration of the purple frost powder. ”

"Oh, did they mention where the Purple Frost Stone was?"

"No, though, I think I already know where the Purple Froststone is. ”

"Oh, where?"

"It's in the cave of the back mountain that Zuo Ziwen said, but not in the cave, but in the underground of the cave. If it is a purple frost stone, it is natural to be buried in the ground. Because on the ground, the stone will absorb a lot of vitality, and the lightning emitted will be correspondingly much stronger, but the underground is different, generally speaking, in addition to the Yuan vein, the underground vitality is relatively small, which can weaken the lightning emitted by the stone. In addition, there is a trace of excavation, but it is very shallow, and you can't see it if you don't look closely. Also, there should be a very hidden formation underground, which even my divine sense can't detect. ”

"Oh, so I can dig it up at night?"

"No, if you dig it, you'll definitely be discovered. Therefore, you need a set of formation chess, which can block the formation chess of the Yuan Master-level divine sense, and you can't do it now, because once the formation chess appears, it will be discovered, and you will not have time to open the formation at all. Therefore, you need to refine a set of formations that can be hidden by a single formation, and this kind of formation should exist, just ask Ximen Wan'er. ”

"Good. ”

"In addition, you still killed Zuo Ziwen, I suspect that he knows the place of the Purple Frost Stone, and he should also know that there is a formation underground, but he only said about the cave, not the underground. ”

"When I get the Purple Frost Stone, I will deceive him, if he will still deceive me, I will destroy his Yuan Dan. ”

Nangong Feng said, and went to Ximen Wan'er's place, and discussed with Ximen Wan'er, Ximen Wan'er did know that there was such a chess. It is to arrange a separate hidden formation on the formation chess, and then all the formation chess is started together, which can be made into a relatively strong hidden formation. Of course, it is not easy to hide the hidden formation on a single formation chess under the divine consciousness of the late Yuan Master. However, since there is Ziyu, the problem is not big, but it will take time to refine the array chess.

Nangong Feng mentioned the ability to defend and attack, whether it can be added. Ximen Wan'er said that the hidden formation actually has very little attack ability, she can strengthen some defensive capabilities, and the attack ability is not needed for the time being. Nangong Feng agreed, Ximen Wan'er mentioned that it would take half a month, and Nangong Feng also agreed.

Then Nangong Feng went to cultivate, and Mu Ming reminded him that he still had to be careful when that late Yuan Master came back. Nangong Feng thought that he didn't need to fight them anyway, so it didn't matter.

For half a month, Mu Ming was still scanning with his divine sense, so Nangong Feng still knew about the things outside. For half a month, the attacks from outside have been continuous, and then two more Yuan Masters came to the Giant Sword Gate, and they strengthened their attacks. But the Zuo family and the Liu family were not nervous, and they still guarded like that. In addition, the Yuan Master of the Zuo family has never come back in the later period.

Half a month later, Ximen Wan'er's array chess was finally refined. There are a total of eight strokes in this set of formations, and the hidden formation after the arrangement is still quite strong, and it can be hidden under the Yuan King's divine sense. Of course, the defense is relatively weak, and if it is attacked by the marshal in the later stage, it will not last long. However, for Nangong Feng now, it is already very strong, so after thanking Wan'er, he took over the chess.

After Nangong Feng refined, he waited until night and flew to the underground cave, which was the closest to the bottom of all the underground caves, and this was also the place where Mu Ming found something abnormal. If there was no Purple Frost Stone in this cave, Nangong Feng would have no choice at all.

He knew that this cave was relatively large, with a space of fifty zhang square, so he arranged this formation to cover this fifty zhang square. Of course, this is also the largest area of this formation, if it is larger, the ability will be reduced. After all, there are not many chess pieces now, and they can't be arranged very big.

In addition, the reason why it was so large was because he was worried that the purple frost stone below would be discovered when he took it away. This is also why he thinks that the purple frost stone below will not be too deep, if it is deeper than twenty-five zhang, then there is no way.

In order not to be discovered, when he arranged the formation, he did not leave the Void Palace, but directly took out the array chess in the Void Palace, and threw the array chess to the ground one by one. After arranging, he activated the formation. Then, he was about to take out his sword to dig a hole, when Mu Ming suddenly transmitted: "There are people down there, come up." ”

"Huh?" Nangong Feng was stunned, why did someone come up. But he immediately found that a sword had been dug out of the ground, and a hole had been made, and a man had come out of the hole. It's an old man, he looks older, but he's still in good spirits.

When this person saw the Void Palace, he was also stunned. Of course, Nangong Feng also swept the other party, and after being stunned for a moment, he knew that he had no choice, since the other party had discovered the Void Palace, he had no choice but to arrest or kill him.

Through Mu Ming, he knew that the other party was the peak of the Yuan Teacher, so he recruited a Yuan Master puppet and used a poisonous explosion to shoot wildly, and all the poisonous explosion balls attacked the opponent. When the other party saw it, they quickly escaped. Nangong Feng saw the other party's speed and knew that his poisonous explosion ball could not keep up with the other party. It was also the other party who flew to the edge of the formation and wanted to break out, but it didn't work.