On the island of the Holy Tree. Ye Qingmian spent seven happy days with his parents in the space of consciousness. Unconsciously, Ye Qingmian's heart became more and more peaceful, and only the world he saw was left in his eyes, completely forgetting the trivial matters in the outside world that would involve his energy.

Xuan Jiafena stepped on the void and stretched lazily, he didn't expect that Ye Qingmian had so many things to worry about in his heart, and it took him seven days to block out the outside world.

"Today we can start teaching you how to use immaterial life. Xuan Gafina said.

Ye Qingmian opened his eyes with his eyes closed, if anyone could see his eyes, they would definitely be very surprised, because those eyes were indifferent and ethereal, calm and profound, and it seemed that all the attention was focused on the next training.

Beside Xuan Jiafina, a phantus wearing a black robe and a hood appeared, and Ye Qingmian could vaguely see that it was a thin old man, with shriveled and rough skin, and there seemed to be no flesh and blood on his body.

After the old man appeared, the figure of Xuan Gafina disappeared. There are only two people left in the entire consciousness space, Ye Qingmian and the old man, and for Ye Qingmian, he may be the only one, because the old man opposite does not look like he is alive.

Under the hood, a cautious smile broke out on the lower half of the old man's face, "I am indeed not a living person in your concept. ”

"Then dare to ask the old man, are you...?"

"Oni. ”

Ye Qingmian was stunned for a moment, and then he was a little stunned. If anyone is the most in-depth and familiar with the development of immaterial life, it must be the ghost race, because they are such a race that relies on pure immaterial life to survive. In the dream world, I am afraid that I really can't find a teacher who is more suitable for me than the old man in front of me.

The old man asked, "Why does a man with a knife have an advantage over a man with his bare hands?"

"Because the knife is hard and sharp. Ye Qingmian replied.

"On the beach, you tried to hit the dark blood with immaterial life, but you were stabbed by his fingers, what do you think is going on?" the old man continued.

Ye Qingmian recalled for a moment and guessed, "You mean to say that his immaterial life was harder than mine at that time?"

"Density. The old man said, "You condense supersolid air as a weapon, so have you ever thought about what you condense is not air, or even matter?"

Ye Qingmian understood what the old man meant, but he was a little puzzled, "You mean, let me try to condense the immaterial?"

"A more accurate description of your knowledge reserve should be the condensation of immaterial information. The old man said.

"It's... What's the use?" Ye Qingmian frowned, simply condensing immaterial information and considering immaterial energy, then it would not have any impact on the material world. He controls the air and the sea, and he also relies on immaterial life energy, and without energy, he can't do that at all.

"Attack me. The old man said, not caring that Ye Qingmian would hurt himself.

Ye Qingmian felt it, the consciousness world he was in was semi-simulated and real, it could be said to be a dream within a dream, and the air still existed, so he skillfully condensed a ball of ultra-solid air.

"Offended. Ye Qingmian said, with a wave of one hand, the ultra-solid air balloon cut through the space, leaving a detonating cloud in place, which instantly smashed on the old man.

Since the other party is so himself, Ye Qingmian did not spare the slightest. However, in the next second, Ye Qingmian's expression changed greatly, he found that the old man did not have any scars on his body, not even his robe was damaged, but his ultra-solid air balloon seemed to be an ordinary balloon that hit the iron plate.

"What's going on?" Ye Qingmian was a little frightened, although he had a certain difference in his heart, but the other party was too light-hearted.

The old man slapped at the ultra-solid air balloon, the air balloon disintegrated instantly, and after losing its restraints, it turned back into a gaseous state, and the violent wind pressure blew Ye Qingmian far away, and the old man's body did not even move the corners of his clothes.

Ye Qingmian came back to his senses, and the old man appeared in front of him again, as if the distance between the two people was locked and would not change.

Ye Qingmian gritted his teeth, and the immaterial life directly impacted the old man, but at the moment of impact, it was as if the whole person was speeding into a wall and slammed it hard, but the wall had nothing at all.

When Ye Qingmian recovered from a brief period of confusion, the old man slowly spoke, "There is a limit to the immaterial information contained in a unit space. ”

"What do you mean?" Ye Qingmian didn't quite understand.

"The more immaterial information content a unit of space contains, the higher the density of immaterial information. The higher the density of immaterial information per unit space, the more difficult it is to be instilled with new immaterial information. When the density of this space reaches a limit, we can say that the space is full of immaterial information. ”

"It's like a piece of paper that is densely packed with words, and the more words there are, the more difficult it is to write a few new words. The same is true for immaterial information. When the density of immaterial information in a space reaches its limit, new information cannot be entered. Matter containing immaterial information can no longer enter this space. ”

"For any substance that wants to enter this space, this space is like a wall, tight and solid. Your supersolid air balloon can't hurt me, because it's blocked by a thin surface of immaterial density limit space. The moment you hit me, it felt like you hit a wall, and it's the same way. ”

Ye Qingmian took a deep breath, he didn't expect such an escape, if it wasn't for someone to teach, he probably wouldn't have thought of this at all.

And Ye Qingmian remembered that in the mental hospital, the piece of moving brick that smashed him in the ritual game, is it almost the same reason? That is the skill of the ritual game to ask for 10 million tuition, but he will definitely not teach himself wholeheartedly, but will definitely keep his hand. Fortunately, the tuition fee was not paid, and it looks like it can be saved.

As soon as Ye Qingmian's thoughts drifted away a little, he was dispelled by a strange force, and the memory of the ritual game began to fade, and his energy was refocused on the old man in front of him.

"I've heard that in the war between the Real Land of Two Blades City and the Ghost Clan, the people of Two Blades City can hurt or even kill the Ghost Clan through their emotional outbursts before they die, so is this method of condensing immaterial information flawed?" Ye Qingmian asked.

The old man said, "Immaterial information always flows from places with high density to places with low density, and the higher the density of immaterial information per unit space, the more difficult it is to restrain it." ”

Ye Qingmian thought for a while, "So it still needs to be based on the total amount of immaterial life, so is the density limit that everyone can make different?"

"That's right. There is a limit to the density of immaterial information, but this limit can only be approached infinitely, just as the existing technology on Earth cannot allow a spacecraft to reach or exceed the speed of light. Each person is different, and the limits of what they can achieve are also different. The soldiers fighting against the Two Blades are all low-level ghost soldiers, and the density of condensed armor is naturally not high, and the defense will be torn apart under the impact of the unsustainable high-density information flow before the opponent's death. ”

Ye Qingmian nodded, understood the other party's statement, and then continued to ask, "My current immaterial life strength is very high, and the immaterial energy is also huge, and I can exist independently for a long time, but I don't dare to completely break away from the carrier for many years." However, the ghost race has always existed as immaterial life, have you always maintained this barrier of extreme immaterial density on the surface of your body to resist the chaotic flow of immaterial information in the universe?"

"Yes, but if you want to do that, you need to practice for a long time. It's simple, and it's hard. The extreme density of space that moves with the body surface is completely different from the ultimate density barrier in a fixed position. The former needs to be as thin as possible in exchange for being as dense as possible with fixed immaterial energy, and not hindering its own movement. Now, you're trying to concentrate the immaterial information on a single point. ”

Ye Qingmian seriously concentrated on the palm of his hand, and the immaterial life energy frantically expanded outward and plundered, concentrating the immaterial information nearby.

I thought it wasn't a particularly complicated thing, but after really operating it himself, Ye Qingmian found that it was really difficult, and it was very different from the situation of controlling the substance for compression.

Ye Qingmian felt as if he was pinching a balloon and wanted to compress it, but if he held it tightly, the gas would run to the other end, or even leak out at the other end.

"You practice preliminarily, don't go to compress. The old man said slowly, "Set a point first, and then stuff the information in." ”

Ye Qingmian nodded and began to do according to the old man's words.

"Smaller. The old man said.

Ye Qingmian reluctantly gave up and filled a space the size of a ping-pong ball instead.

"It's a little smaller. ”

"No matter how small. ”

"No matter how small. ”

It wasn't until Ye Qingmian's preset space was invisible to the naked eye that the old man nodded and motioned for him to continue.

After several hours of trying, Ye Qingmian was finally able to stabilize this tiny space, and he could feel that the density of immaterial information in this space was getting higher and higher!

Is it done? Ye Qingmian's heart moved, and he couldn't hide his excitement. However, just when his energy was slightly distracted, there was a trace of instability in the control of this small space, and the stability of the entire high immaterial information density space was instantly destroyed, and the original balance was broken in an instant.

Subsequently, Ye Qingmian only felt that the fierce and sharp immaterial information flow was scattered like an explosion, and the self who was close at hand was solidly affected, was this going to be blown up by himself? Ye Qingmian felt aggrieved in his heart, and then fell into chaos.

In the next second, Ye Qingmian woke up suddenly, but there were no scars on his body, as if the explosion just now was just an illusion.

"Don't worry, you can't die in this space. The old man said flatly, "Go on." ”

"Okay..."Ye Qingmian began to condense the immaterial information on one point again, but this time, he didn't dare to be careless. He knew that if what had just happened happened in a real environment, then his immaterial life would definitely be either dead or injured under that level of impact.