The pulse of the palm of his right hand was so clear, Cheng Lin tried to calm himself, not to show flaws, and walked towards the dormitory area of the single-family building.

He was going to go for a meal first, but now, he didn't have that mind.

……

Dormitory area.

Familiar with the door went upstairs, took out the key, opened the door, and used his ability to make sure that there was no prying eyes around, and then he stood in the dormitory living room, and raised his right hand slightly.

A flash door appeared silently in front of me.

The height of the room is limited, so the door is not too wide.

"I don't know what the upgrade will look like, the space must have expanded a lot, so I'm afraid that the soil is not enough, and I have to find a way to steal the soil again."

Cheng Lin stepped into the spiritual realm in one step.

……

Within the spirit realm.

As soon as he landed, Cheng Lin sensed a breeze blowing towards him.

He subconsciously took a breath, the air was moist and clear, like the morning after the rain, making his whole person feel much refreshed.

"Huh? No, how can there be wind? ”

However, he soon realized that something was wrong, there was no wind in the spirit world before, and because there was no sun in the spirit world before, the light source was all provided by the World Tree, so it was always at a constant temperature, which caused the air flow to be very stable.

This is clearly no longer the case.

Thinking of this, Cheng Lin immediately looked up at the sky and his eyes widened.

"It's ......"

He was amazed to see that there was a "sun" hanging in the sky!

Yes, not only that, but there are blue skies and white clouds, as if they were outside, only a little clearer than outside!

"How did this evolve here?"

Frightened, he took a closer look before he suddenly saw something unusual.

"No, it's not the real sky and the sun, it's more like ...... A painting? ”

Yes, the "sky" above his head is flat, like a dynamic sky wallpaper, pasted on the top, to have a similar effect.

It's amazing.

And that's not all.

Cheng Lin lowered his head, looked at this spirit realm, and found that the space was indeed unexpected, it had been greatly expanded, the original spirit realm was about fifty meters long and wide, and about twenty meters high, but now, the length and width were two or three hundred meters! The height is also more than 100 meters!

Roughly converted, it is about the size of 4-5 football fields.

That's pretty impressive.

And what surprised him the most was that such a large area was actually crowded with soil, to be precise, grass.

As far as the eye can see, it looks like a grassland.

"Where does the soil come from? Is it that it comes with the upgrade? Or is it made by the World Tree? ”

In confusion, he finally looked at the World Tree, and sure enough, it had become even larger, with a height of more than 100 meters, almost touching the limit of space, the whole tree exuded infinite vitality, and the branches radiated in all directions, with a little rudimentary form of the World Tree in the Elven World.

The dense canopy of the trees is bright with fresh green foliage, as if it has just rained.

Seeing him look over, a shadow flew out of the canopy, chirping, and flew in front of him.

It's Ciri.

It seemed to be very emotional, and it didn't seem to be scared, but more like incomprehension and amazement after witnessing the great change.

"Rare and weird." Cheng Lin glanced at it and said with a chuckle.

I immediately went to check my belongings first, and found that there was no problem, there was no damage, but the bed was wet.

Relieved, he walked towards the World Tree and reached out to touch the trunk.

A "panel" emerges in front of you:

Name: World Tree (Level 4)

Experience: 5034/10000

Condition: Good

Reminder: The Level 4 World Tree has a certain ability to transform the environment, and can improve its living environment through existing materials, including: soil, grass, air, rain, etc., and can simulate the weather to a certain extent with the "Spirit Realm".

……

"Sure enough." Cheng Lin's eyes were revealed.

A level 4 World Tree can actually make soil? Well, looking at this description, it should not be made out of thin air, but produced according to the existing soil.

Theoretically, soil is just a collection of elements, and while the creation of soil sounds fantastical, the World Tree cannot be speculated on by common sense.

"According to the instructions, is this a self-circulating system now?"

He remembered that the previous spirit world also suggested that if there was a lack of water, it needed to be replenished from the outside world.

In fact, Cheng Lin did find an opportunity to replenish during this time, and it was very simple, just find a river and open the entrance to the spiritual world in the river.

Each time I added a little bit, because the area is not large, so there is no problem.

This reminded Cheng Lin of the famous "Biosphere 2".

All in all, it's more of a separate world – though still small.

As for the aura concentration...... Cheng Lin felt it with his experience and found that it was about 7,000 marks, which was slightly lower than he expected, and it seemed that most of the aura had been swallowed by the World Tree......

This made Cheng Lin a little resentful: "Can't you leave me more?" ”

But this actually made him very satisfied, even if it was the No. 16 spiritual land, it could not exceed the 5,000 standard, and even if the concentration here was not as good as the top spiritual land in China, it could still be among the top lines.

"I just don't know if I can keep it, but don't suck it and it's gone."

As he pondered, he suddenly heard the chirping of Ciri next to him, flying around his eyes, and then flying backwards around the trunk of the tree, as if ...... In making him look at something the same.

"Is there still a change?"

Cheng Lin frowned, followed Xi Rui to the "back" of the World Tree, and immediately paused, with an unbelievable look on his face.

I saw that on the trunk of the tree, there was a "tree hole".

This tree hole is not deep, about two or three meters, at the end of the tree hole, is a small "light door", oval-shaped, emitting a faint light.

At the same time, Cheng Lin felt a shock of the mobile phone in his pocket.

He hurriedly took it out, and found that it was a blank notification popping up in the notification bar, he clicked on it curiously, and actually jumped to the "deduction program app", and opened the "History Library" page after a slight load.

I saw that in the dark gray "Historical Deduction" card, the only card pointing to the elven world emitted a soft blue light on the edge.

"Isn't this ......?"

He clicked on the screen with a slight tremble, and saw a dense text popping up on his phone.

Bowing his head and reading it word by word, Cheng Lin's breathing became short.

Here's an explanation.

He guessed right, as early as the end of the elf projection, the "not yet open" that appeared can finally be opened!

"According to this explanation, the passage to the elven world has been opened, and I can open or close it at my discretion, but this passage does not seem to be very stable at the moment, so it cannot be used by creatures above the middle level......"

Putting down the phone, Cheng Lin stared at the "tree hole" in front of him, his eyes glowing with a strange brilliance.

He had had had a lot of speculation about this feature, but he never imagined that it would be implemented in this way.

"It seems that the reason why the elf card was lit up is probably related to my obtaining the World Tree Seed, which is the basis of the bridge connecting the two worlds, and its level was too low before, so this function was not activated."

"Is there a restriction on the passage of creatures above the intermediate level? Doesn't that mean I can't get in? ”

Cheng Lin tentatively walked into the tree hole and tried to enter, but felt a strong resistance.

"It seems that I can't get in," Cheng Lin was a little regretful, and then thought, "The tree hole is limited to the middle level, which is converted, that is, the fourth grade, and now the world tree level is level 4, is there a connection between the two?" I'm not sure, maybe there is, maybe not, but it's possible, that is, as long as I continue to upgrade the World Tree, it's possible to strengthen this channel. ”

After a little analysis, Cheng Lin had an idea.

However, it is not easy to improve the level of comfort, the higher you go, the more "experience" you need to upgrade, and the materials for the Spirit Gathering Ritual may be able to find a way to get together, but the opportunity is very rare.

This time, it was Dragon Island that had accumulated countless years to have such an effect, and the next time it encountered a similar opportunity, I don't know what year or month.

Shaking his head and not thinking about it anymore, Cheng Lin began to analyze the possibility of using this channel.

The first thought was to ask the elves to help build the spirit world.

Now that the area of the spirit world has expanded a lot, the infrastructure is not perfect, and a large area of land is deserted, perhaps the elves can be hired to reclaim it, and even the spirit plants, plants and trees can be purchased from the elf world.

Thinking of this, Cheng Lin's heart was surging.

"The first thing is to get in touch with the other side."

He first tried touching the channel with his synaesthesia ability, and found that it was still blocked, indicating that the ability couldn't cross the boundary.

"Maybe you can write a letter and throw it over, but it's too risky to be unclear about the situation on the other side."

Cheng Lin thought about it seriously and frowned.

Suddenly, he saw Ciri next to him combing his hair on a nearby branch, and his eyes lit up.

"That's right, I've entered the middle level, and I can't get in, but Xi Rui is so wasteful, he should be able to enter the passage, and it has a certain amount of intelligence, and it is also convenient to do things, the only question is, whether it is reliable, will it run directly."

Cheng Lin thought about it seriously, and suddenly had an unreliable idea.

With a slight hesitation, he returned to his locker, tinkered for a while, walked back again, and stretched out his left hand: "Come here." ”

Ciri didn't know why, but flew to his palm, and immediately saw Cheng Lin tie a paper roll tied with a string to its leg, and then his right hand pried open Ciri's beak like lightning and stuffed a small pill into its esophagus.

"What I just fed you is a poison, and if you don't take the antidote within 72 hours, you will die of a puddle of pus.

Don't look at me like that, you help me deliver this letter to the other side.

Well, when you meet a creature that is particularly good-looking, human-like, give the letter to the other party, and it is best to bring back a reply from the other party.

After that, I'll give you the antidote, and if it goes well, I'll give you a reward, do you understand? ”

Cheng Lin calmly recounted.

Xi Rui was completely stupid, looked at Cheng Lin, and then looked at the "letter" on his feet, meaning that this bad "farmer" used himself as a carrier pigeon, and couldn't help but feel sad, but still nodded.

"Very good, then leave immediately, I will wait for your triumph."

Cheng Lin nodded in satisfaction, and then threw Xi Rui directly into the tree hole.

With a whoosh, it disappeared into the passage.

……

Thank you book friends for your life as much as the Internet!