It can be said that it took Chen Lin more than half an afternoon to barely reappear.

After I don't know how many attempts, Chen Lin also gradually found out the doorway, this ability cannot be said to be created out of thin air, in fact, it is to use the energy contained in the heart of the world to constantly condense and change.

When the condensed dark green light is deep to a certain extent, the energy will undergo a qualitative change, and a green grass will gradually grow from the green light.

If you continue to bathe the seeds in the deep green glow of the Heart of the World, the grass will begin to grow at a speed visible to the naked eye, just as it did at the beginning of the attempt.

But it was this process that almost tired Chen Lin down.

Chen Lin looked extremely embarrassed now, his forehead was covered with fine beads of sweat, his face and lips were extremely pale, and his T-shirt had already been soaked with beads of sweat several times, dry and wet, wet and dry.

Even though he had turned the air conditioning temperature in the room to 16 degrees, and even though he was actually so cold that his teeth were shivering, he couldn't stop being so tired that he was sweating.

Originally, those two grasses appeared in the dormitory, and I am afraid that this is also related to the fact that he has spent almost all of his time in the dormitory studying the Heart of the World for the past week, so that the entire dormitory has been bathed in the brilliance of the Heart of the World for a long time.

This gave him the illusion that it would be easy to replicate this otherworldly plant, which now doesn't seem to be the case.

The consumption was beyond imagination, and the reason why he didn't feel it last week was only because he squandered all the physical strength needed for a week in this afternoon, and naturally felt a great burden.

Although Chen Lin didn't want branches, but bark, at least it was a good start.

His guess was validated, and now the two functions of the Heart of the World could be preliminarily determined.

The first is to promote the growth of plants, but it is uncertain if this function will be useful when traveling to other worlds in the future.

The second is that through the magical energy in the heart of the world, which is called the power of nature in the dream, through the power of nature, some abilities of those trees in the original third-level plane can be reproduced.

The first function was put aside by Chen Lin for the time being, and the second function he was now focusing on developing.

So his roommates were helpless to find out again that Chen Lin had become elusive again after two days of normalcy.

In the next few days, Chen Lin was still very busy, but fortunately, there were no courses now, and he didn't think about going to an internship or looking for a job, so he had a lot of time.

Chen Lin's focus was still on how to reproduce the bark of a tree as hard as iron, and after several failures, he realized that his method was actually wrong.

This is also thanks to the dream after the destruction of the world, that is, the entire development process of the world transmitted through the heart of the world, those trees did not have this kind of defensive bark originally, but after being attacked, after the heart of the world opened the defense mechanism, it only produced a stress evolution.

In the dream, those trees spread a large number of cells in their bodies on their surface, and then fed back to the local natives through the special energy of the heart of the world, gradually keratinizing these cells and forming dead tissues, and this layer of dead tissues composed of otherworldly plants has a defense ability comparable to metal.

The key point is the control of the heart of the world.

Fortunately, Chen Lin didn't need to master the method of making the entire tree race evolve, nor did he need to let a towering tree evolve, all he wanted was a layer of bark that could cover the surface of his body, and the volume was much smaller than before, and the difficulty was naturally much lower.

Finally, after four consecutive days of various attempts, Chen Lin had initially mastered this method, forming a layer of keratinized bark on the surface of the skin through the power of nature contained in the Heart of the World.

Although the limit of what he can do now is only to reproduce a piece of bark that is only the size of a palm, the strength of this bark has surprised him enough.

The stone couldn't be smashed, the fruit knife couldn't cut it, and he could even slam the brick with his palm covered in bark, but he could only feel a slight tremor.

Of course, it is unknown whether it is bulletproof or not, and there is no condition for him to experiment.

It's a pity that his ability is not enough now, and he can only condense the bark of this size, but he imagined a little that if his ability was enough in the future, he would cover his whole body with a layer of bark.

Uh, isn't that a tree man?

Chen Lin thought a little ridiculously, with the word "Lin" in his name, could it be said that he himself was born to become a tree?

In addition, in the research of these days, Chen Lin also had an unexpected surprise.

The amount of physical energy and spirit he needs to consume every time he uses the Heart of the World is actually very large, especially if he repeatedly summons this keratinized defensive bark, after a few times, he will be exhausted and almost collapse.

But one afternoon, when he was exhausted to the limit, he happened to find that there was no water in the house, so he could only drag his tired body to the nearby supermarket to buy two bottles of water, and when he came back, he found that his spirit was actually a little better, although it was not obvious, but in a state of extreme exhaustion, even a little improvement would be easily felt.

After further research and experiments, Chen Lin was surprised to find that he seemed to be able to recover his physical and mental exertion by basking in the sun.

He naturally thought that this was probably also an incidental effect of the heart of the world, after all, the plants of that world also grew through photosynthesis at the beginning, and the flower princess who had passed through the group before had also given him a few magical petals, so that he temporarily had photosynthesis.

This means that it is obviously not completely unimaginable for him to have photosynthesis as a human being through some special means.

However, the physical strength to recover in this way is still quite limited, Chen Lin roughly assessed that in his almost collapsed state, when the sun was at its strongest at noon, it would take more than three hours of exposure to the sun, and his physical fitness could recover a little considerably.

If he wanted to fully recover, Chen Lin felt that he would have to bask in the sun for at least six hours, and if the impact of the sun intensity was taken into account, this time might even be doubled.

Either way, it's a very helpful approach.

Since he began to study the heart of the world, Chen Lin's spirit is actually worse day by day, his face is slightly pale, and he even feels a little fluttery when he walks, although he ensures that he sleeps for almost ten hours every day, and every day he ignores the increasingly empty wallet, the tonic of big fish and meat, but it seems that the effect is very little.

In the words of his roommate Qin Yang, this is a typical symptom of kidney deficiency caused by too much masturbation, and he also kindly admonished him to force the truth of masturbation.

But only Chen Lin himself knew that this was because he used the Heart of the World too many times and time every day, resulting in excessive physical and mental depletion, and it was difficult to fully recover by relying only on ordinary sleep and rest, and the accumulation of half a month in a row would cause him to look so embarrassed now.

If basking in solar energy solves this problem a little, it will be a great help to Chen Lin.

It's just that this is both bark and photosynthesis, and Chen Lin feels that he is going farther and farther on the road to becoming a tree man......