When everyone heard this, they immediately felt a burst of excitement in their hearts, to be honest, they couldn't help but go back to retreat immediately, and then spend a little time refining the harvested fairy grass, and then increase their cultivation.

They think that these fairy grasses are a great harvest, but now listening to Qin Nan, these fairy grasses are just small heads, and the real big heads are divine objects, which are the tails left by the middle and early ancestor dragons, and they don't know how strong they are than these fairy grasses.

The people went on and walked, and they saw a lot of coins of various ages, including gold and silver coins, which looked very old, and there were even shadows of jewels scattered on the ground.

If these things are placed outside, they are also things that others force their heads to, and they can be directly used as hard currency to buy things.

But for Qin Nan and others, they don't necessarily look at these things, for them now, the so-called money is dung, and there is no difference between the two.

In a word, to put it mildly, that is, the mountains of gold and silver are placed in front of them, and they may not be moved. No amount of money is of any use to cultivation, because what cultivation pursues is immortality, cultivation, and martial arts and Taoism, and in their eyes, money is a completely mortal thing.

Qin Nan and the others continued to move forward, walking for a few hours, the situation under this underground became more and more complicated, if they were a little careless, they were afraid that they might get lost in it.

At this time, Qin Nan discovered something new, that is, the traces of excavation, yes, he felt that he and the others seemed to have reached the end, and at the end of the so-called black hole, various passages were being excavated one after another.

It is equivalent to Qin Nan and the others walking away, but this black hole was dug out on the side, thinking of this, Qin Nan and the others were immediately shocked.

What kind of terrifying speed is that? It's even more terrifying than the Mountain Beast.

Qin Nan squatted in the corner of the wall, carefully looking at the traces left by the excavation, the soil was still new, and the traces left on it looked smooth and smooth, as if something had been dragged from it.

Qin Nan raised his head and looked over, only to see that the height of this cave was also terrifying, the high place was dozens of meters high, and the low place was more than ten meters, which could accommodate tens of thousands of people casually.

"The roots of the tree. ”

At this time, Qin Nan picked up a small debris from the ground, and after careful identification, he recognized that it was actually the root of a tree.

The roots of the tree do not belong to the roots, but to the soft whiskers on the roots, which are probably left over from the sliding here.

Thinking of this, Qin Nan suddenly narrowed his eyes, he seemed to already have an idea in his heart. Now they are in a position that is at least a few thousand meters underground, and at such a depth, it is impossible for the roots of ordinary trees to extend here.

Moreover, the ordinary number of roots is not discerning, and as for the one before him, he has never seen it. Although this tendrils are small, the toughness is extraordinary, and it is difficult to tear off, in short, you can see at a glance that it is not left by ordinary tree roots.

Qin Nan came to the conclusion that these empty underground caves in front of him were carved out by a big tree. That's right, it must be a big tree, Qin Nan can be 100% sure.

At this time, everyone gathered around him, waiting for him to say something, but in the end, Qin Nan didn't say a word, and his face was surprisingly calm.

In the end, he didn't show the roots in his hand to the others, he felt that if he told the news, he was afraid that everyone would be shocked.

Although everyone would know the truth sooner or later, Qin Nan felt that he couldn't accept it now, and he was still ready to wait for the right opportunity to tell the truth to others.

Next, Qin Nan concealed what he knew, and then continued to walk towards the depths of the black hole with everyone.

The further you go, the fresher the traces left by the excavation of the passage, which already says something.

At this time, everyone's anger became strange, and it seemed that they had already understood what kind of environment they were in.

"I don't think it's right, where did you get so many tree seeds?" said at this time, the little Buddha Hitomi squatted on the ground.

The little Buddha's eyes were sharp, so she happened to see many tree seeds scattered on the ground, all over the ground.

Everyone ran over to take a look, and saw that there were indeed many silver-yellow tree species the size of fingers on the ground, a bit similar to Bodhi seeds, with a layer of crisp capsule, which was gently peeled off.

"Where did this tree species come from, and why is it so strange?" Feng Lao and the others also muttered beside them, with a look of surprise on their faces.

"What's this? Why are there so many, all over the place. Ao Yin also said lightly beside him, his tone was startled, and he could hear a trace of disgust.

Many unknown things are placed together, and it can indeed create a disgusting visual effect that makes people hairy.

"It's the mother tree that leaves them behind, and they will soon take root here, then thrive, and eventually fill the entire cavern. At this time, Qin Nan said with a solemn expression beside him.

"What? What is the Mother Tree?" asked Lone Bamboo beside him.

A trace of solemnity flashed on Qin Nan's face, and he said, "If my guess is right, now in this cave, the place we walked through just now has been rooted and sprouted by these vigorous mother tree seeds, and then completely occupied. ”

"What?" everyone was taken aback when they heard this, and then they couldn't help but look back.

But looking back from here, there is nothing to be seen, the black hole is empty, and there is nothing to see except endless darkness and silence.

"You can't see it like this, you can see that these mother tree seeds on the ground must have taken root and sprouted. Qin Nan didn't look at the ground, and said expressionlessly.

Everyone looked down, and there were those who were directly prostrate on the ground to observe carefully, this look didn't matter, and everyone was immediately surprised after seeing it.

Sure enough, the seeds of the trees that had fallen to the ground had cracked their silvery hard shells, and small shoots had sprouted from them, and then they had to dig into the dirt, and even the stones would be pierced by them.

When everyone saw this, their scalps immediately tingled, and at this moment, they seemed to be able to hear the sound of these mother tree seeds breaking through their shells and taking root under their feet, "crackling".

"It's really taken root, it's terrifying, what should we do now?" Ao Yin said with a look of surprise.

Imagine what will be the consequences of dropping a tree species that can grow wildly in a closed environment for a long time?