The mountain behind the stronghold, in a forest at the eastern foot of Zhongnan Mountain.

The mother and son of the Condor and Wang Chongyang and Lin Chaoying were standing together, watching strongly.

Dugu Qiu stood half a foot away in front of a tree, and pointed to the sword on his left shoulder, his face solemn.

The next moment, I saw him swing his sword finger at the big tree in front of him......

Well, nothing happened.

Dugu's brows stretched out, and he said happily: "It's done." ”

After speaking, he turned around and walked towards the line where the two of them were.

"Uh......" Wang Chongyang and Lin Chaoying glanced at each other, and they both saw the stunned look in each other's eyes.

In the past two days, they greeted the Condor mother and son, and they were already familiar with them, before they heard that Dugu was defeated and out of the pass, and they were busy taking the Condor mother and son to prepare to go to the meeting.

Halfway through, I met the disciples who had been guarding before, and they said that Dugu had gone to the back mountain.

The two of them chased out of the stronghold with the Condor mother and son, and sure enough, they saw Dugu in front of them seeking defeat, and hurriedly followed to inquire.

Dugu said that he was going to the back mountain to practice a peerless discipline, but they didn't need to avoid it, because even if they were allowed to see it, they wouldn't be able to learn it.

The two of them were very curious about Dugu's mastery, so they followed, but after they arrived, they only saw Dugu holding his sword finger, standing in front of a tree in a daze, and from time to time he waved a blow at the tree.

But every time there was no reaction, the two couldn't help but be bored, but they weren't too embarrassed to leave, after all, they were going to come and see.

Until this time, after Dugu Qiufu waved this finger, he walked towards them, and said it in his mouth, but they didn't see anything.

At this moment, a breeze blew, and movement finally appeared.

Wang Chongyang and Lin Chaoying were shocked to see that the big tree, which had been standing still for half a day, actually fell to the side with a "bang".

The incision in the loins of the tree is so smooth that it is smoother than a carpenter's planer.

"This ...... This is ......" Wang Chongyang and Lin Chaoying were dumbfounded, no wonder Dugu said that even if they watched it, they wouldn't be able to learn, let alone learn, they didn't understand anything at all.

"That's good! I practiced the qi sword to a length of four feet in half a day, and I really deserved to be a sword demon. There was a clear exclamation behind everyone.

Air sword?

Condensing the sword with gas?

Wang Chongyang and Lin Chaoying's faces showed a sudden look, so it was so, condensing the true qi into the form of a long sword, shadowless and formless, but it was incomparably sharp and indestructible, and it was even more defenseless than holding a divine weapon in his hand.

But as soon as the true qi leaves the body, won't it dissipate within two breaths at most? If you want to maintain the sword form, don't you have to keep outputting the true qi? Then even if you have a hundred years of strength, it will be quickly exhausted, right?

It is obviously impossible for Senior Dugu to have a hundred years of skill, and he will never maintain the sword form by continuously outputting true qi, otherwise he would not have practiced here for half a day, and he would not have been able to practice for half a day.

So how did he keep his true qi in sword shape without losing much power?

"Wow Wow"

The Condor mother and son turned to look at Luo Changfeng, who had just arrived, and said hello to him.

"Brother Luo, you're also out of the customs. Wang Chongyang also spoke.

Luo Changfeng nodded to them, then looked at Dugu and said with a smile: "Why don't you continue to extend?"

Dugu shook his head and said: "There is no need, four feet is enough, if it is farther, the pressure on the mind is very great, although the qi sword does not consume much true qi, but the loss of the mind is still very large." ”

Mind?

Wang Chongyang and Lin Chaoying's hearts moved, and they secretly kept this information in their minds.

Luo Changfeng also nodded slowly suddenly.

That's true, outside of the true qi, there is the heaven and earth aura, and the heaven and earth aura is borrowed, and it doesn't consume their own strength, they only need to pay the part of the true qi that is condensed into the sword shape.

However, the aura of heaven and earth can communicate with the mind, and the consumption is naturally the power of the mind.

If it weren't for this, if they didn't consume their own cultivation and only wrapped their bodies and weapons with the aura of heaven and earth to fight the enemy, wouldn't they be able to fight all the time, from Jiangnan to Shangjing?

There is naturally nothing so cheap in this world, if you want to get something that does not belong to you, you must pay something that belongs to you, this is the rule of the operation of heaven and earth, and it is the eternal truth.

When Luo Changfeng didn't understand it before, he thought that the aura of heaven and earth was triggered by the unique rhythm of Ah Qing and the white ape's swordsmanship.

Later, I found out that the rhythm in their swordsmanship was to attract the power of the mind and communicate the aura of heaven and earth.

It's just that the power of the mind is ethereal, but it seems to be very huge, at least much more than the internal force true qi.

Moreover, the aura of communicating heaven and earth is not like the true qi of internal force, which is directly cast to attack the enemy, so the consumption of mental power is very slow.

This is the reason why Luo Changfeng and Dugu were defeated at the beginning, and they could continue to fight for more than three hours.

But no matter how slow the consumption is, there will be consumption after all, and for the sake of sustained combat ability, it is better to reduce the consumption of the mind as much as possible.

This condensing qi sword itself has a great demand for the aura of heaven and earth, and the consumption of the mind is naturally large, using the qi sword, no matter whether Dugu is defeated or Luo Changfeng, he will no longer be able to fight for three hours in a row.

Half an hour at most, and then it should be lethargic and lethargic.

Therefore, things like air swords can only exert their power when fighting alone, and they are not very suitable on the battlefield of thousands of troops.

However, against ordinary creeps, there is no need to use such a lore technique, just use a sharp sword to mow the grass.

In addition, it is worth mentioning that although the qi sword consumes a lot of mind, Luo Changfeng's Changfeng Flying Knife and Li Xunhuan's Xiao Li Flying Knife are even more terrifying when they consume mental power.

With Li Xunhuan's mental strength, he could only send out two knives at most, and he had to sleep.

This is also the reason why Li Xunhuan has never had one flying knife, because he didn't dare to send a second knife.

Luo Changfeng is a little better, his Changfeng sword technique already contains a method of exercising mental strength, although it is relatively low-level, but it is also very good.

With Luo Changfeng's mental strength, it was enough to support him to send out three or four long wind flying knives, and he would not be unconscious, if he forcibly issued the fifth knife, then he would definitely lie down.

However, he is different from Li Xunhuan, he has sixteen flying knives, even if he doesn't use the Changfeng Flying Knife, his ordinary flying knife technique is already very powerful, and the people who can force him to use the Changfeng Flying Knife are almost rare in the low-martial arts world.

At least he has to be a person of Dugu's level to defeat him, so that he is qualified to force him to use the Long Wind Flying Knife.

Ordinary opponents, with swordsmanship and ordinary throwing knives, are enough to settle down.

Besides, the Changfeng Flying Knife is his real killer weapon, and it has nothing to do with the level of the opponent's martial arts, as long as he is locked by his mind, he will definitely die, so he will not use it easily.