When he was developing, Chu Zihan also discovered a small thing.

He found that the leaves that were illuminated by the sun would have a comfortable feeling, his whole body felt warm, and his body was very relaxed and happy.

This made Chu Zihan slightly surprised, and then he carefully observed the leaves that were irradiated by the sun before he understood what was going on.

When these leaves are exposed to sunlight, there will be some very tiny things in the leaves, absorbing some unknown gases from the outside world, and then extracting some cool substances from the body for chemical reactions, and soon after exhaling another gas and producing a substance rich in energy, which is transported to the heel of his body as a component of plant cells.

That feeling of pleasure is generated in the process.

"Is this photosynthesis? Inhaled carbon dioxide, exhaled oxygen? "In the last ten years, Chu Zihan came into contact with some battlefield fights, small-scale battle commands, and other things related to battles every day.

Although he had always heard about the photosynthesis of plants before, it was only through written teaching, and it was the first time he had experienced it like this.

Then he carefully felt every tremor of the leaves, every opening and closing of the pores, and gradually, Chu Zihan found that photosynthesis seemed to have something in common with the absorption of vitality. It's just that when I used to cultivate, I absorbed the vitality into the body, and while refining my body, I expelled the impurities in the body through the pores, while photosynthesis absorbed carbon dioxide and water, and expelled oxygen.

"Vitality !!" A thunderclap suddenly flashed in Chu Zihan's heart.

After being stunned for a long time, Chu Zihan smiled bitterly and muttered, "It took me six days to think of vitality."

In the previous life, as the barriers between the two worlds were broken, not only powerful otherworldly creatures appeared on the earth, but also the unique vitality of the otherworld.

Subsequently, with the help of that mysterious system, human beings were able to absorb vitality, gradually break the shackles of the human body, break through the lifespan, and burst out with all kinds of incredible powers and so on.

In fact, it is no wonder that Chu Zihan only thought of Yuan Qi now.

Before the end of the world, although there were some sporadic vitality on the earth, it was too little, and the amount of vitality that Chu Zihan swallowed in one day in his previous life far exceeded the sum of all the vitality on the earth now.

And if it weren't for the help of that mysterious system, the speed at which humans absorb the vitality is very slow, which is basically better than nothing.

For all these reasons, Chu Zihan only thought of Yuan Qi now.

Thinking of this, Chu Zihan began to calm down, and after half an hour, his mind gradually entered a state of selflessness, and slowly, the chirping of birds disappeared, and the surrounding trees and pedestrians gradually disappeared until they disappeared.

At the same time that Chu Zihan's consciousness fluctuations were completely stable, more than a dozen white points of light that were only the size of fine dust appeared sparsely around Chu Zihan four meters away.

These white points of light are the most important reliance of human beings against all kinds of powerful otherworldly creatures in the last days, the vitality.

Then Chu Zihan began to use the cultivation methods of his previous life, and suddenly, a faint suction force emerged from his body, and those points of light slowly flew towards Chu Zihan under the suction.

10 cm, 20 cm, 30 cm...... 80 cm, 90 cm, one meter.

Half an hour later, Chu Zihan's spirit was already a little weak, and a large amount of spiritual power was consumed, causing him to be a little drowsy now, but those points of light only advanced 1 meter towards Chu Zihan.

Looking at this scene, Chu Zihan chuckled lightly and muttered, "Sure enough"

In the last days, it is natural that there will be no such trouble or effort to absorb the vitality with the help of the system.

But now that mysterious system has not yet appeared, Chu Zihan is only based on its general principle, the simulated copycat version, without the addition of the system, will seem so difficult.

After sighing lightly, Chu Zihan began to absorb the vitality again.

An hour later, the closest point of light to him had been inhaled into his body, and at the beginning, that point of light was just floating indiscriminately in Chu Zihan's body, like a rootless duckweed, emitting a hazy white light.

But as more and more points of light were inhaled into Chu Zihan's body, they began to fuse in pairs, and every two points of light fused to form a larger point of light.

Then these larger points of light began to merge in pairs, and in the end, a dozen or so points of light the size of fine dust merged into a point of light the size of a grain of rice, which was about three or four times larger than at the beginning.

But it wasn't over yet, when the fusion of more than a dozen points of light was completed, a faint white light flashed lightly, and the largest point of light disappeared.

Seeing this scene, Chu Zihan was not surprised, but quickly threw his consciousness into the Divine Soul Space.

In the soul space, there were still only a few wisps of white gas floating in the spring in the center, but the big point of light seemed to be afraid of this spring, no matter how it floated in the space, there was always a distance of ten meters from that spring.

At this point, this large point of light seems to be pulled by a mysterious force, like a ball of dough, gradually lengthening and thinning, and finally turning into a thin white thread only as thick as a hair.

In a small corner of the thin line, a faint shade of green was emerging over it, but it was hard to see unless you looked closely.

Looking at this thin thread, Chu Zihan just smiled.

Then he began to absorb the vitality again, although the vitality points within the four meters around him had been completely absorbed, but from somewhere, new vitality points were constantly injected into it, and in just half an hour, those empty spaces had been refilled.

The strange thing was that when the number of Yuan Qi light points within four meters around him reached more than a dozen again, no new light points were injected into them. It seems to have a magical balancing function, ensuring that the amount of energy here is maintained in the same amount, neither decreasing nor increasing.

It was the same in the previous life, although there was much more vitality than now, but I don't know why, only after the amount of vitality in an area dropped to a certain level, there would be new vitality points injected into it.

In this regard, some people have suggested that it may be because the earth cannot withstand too much vitality transformation at one time, and is in the instinct of protecting itself, so it can only introduce a small amount of vitality at a time, and when the vitality of a certain area is consumed, it will be reintroduced.

However, for this speculation, even when Chu Zihan died, it was still not confirmed.

However, this did not affect Chu Zihan's absorption of vitality.

Subsequently, there were constantly points of light being sucked into his body, and the larger points of light that merged into two by two, after entering Chu Zihan's mind, they merged into the white thin line, and every time a large point of light was integrated into the thin line, the faint green on the surface of the thin line would be strengthened by one point.

As the last rays of the setting sun slowly set on the horizon, a large point of light merged into the thin line, and a green light suddenly flashed.

When Chu Zihan put his spirit into the soul space, he found that although the appearance of the thin line had not changed, the color was no longer white, but bronze.

At this time, this bronze-colored thin line was quietly suspended in the soul space.

"It took three days to condense a first-order bronze true element." Looking at this bronze true yuan, Chu Zihan sighed.

Before proceeding with the Yuan Qi cultivation, Chu Zihan guessed that without the help of the system, the speed would be very slow, but he didn't expect it to be so slow.