The reason why Lin Feng was surprised was because he felt that there were energy fluctuations in this cloth bag.

What the middle-aged man handed to Lin Feng must be money from this underground world, which is the so-called Kura. But Kura contains energy, which Lin Feng never thought of.

The currency in the surface world is crystals, crystals are produced from the brains of zombies, and it is understandable that they contain energy. Because zombies need this kind of energy to survive, and the crystals produced by higher-level zombies contain higher energy.

But there should be no zombies in this underground world, but the currency can still contain energy, which is incredible.

However, Lin Feng didn't show it here, maybe it is well known that the currency in this underground world contains energy. If he showed surprise, there must be something wrong. Lin Feng didn't say much at the moment, he opened the cloth bag and pretended to check it, and then left the consignment shop.

Lin Feng, who walked out of the consignment shop, opened the cloth bag, and saw that the kula inside was a kind of metal sheet, which was named for different currency grades according to the color. And they have strange patterns on them, and there is Agura's head on the back.

None of this is important, the important thing is that Lin Feng discovered that it was the gold kula that emitted energy fluctuations.

The currency in this world is one to one hundred. One silver kura can be exchanged for one hundred copper kura, and one gold kura can also be exchanged for one hundred silver kura. However, Lin Feng felt that there was no energy fluctuation between the copper kura and the silver kura, and only the gold kura produced energy fluctuations.

Pull up the vault in the bag. Lin Feng carefully observed the gold kula in his hand, and found that it was a metal that Lin Feng had never seen before, but it was not gold, but its color was golden yellow.

Feel the energy in it. Lin Feng found that it had almost the same energy as the light-colored topaz produced by the second-level zombies. Although there is energy in it, it is not much for Lin Feng.

Feeling the energy in it, Lin Feng tried to absorb it. A strange thing happened, the energy in Jinkula could be transmitted directly into Lin Feng's body through Lin Feng's hand.

And after Lin Feng absorbed the energy from the Jinkula, the Jinkura in his hand broke into countless pieces at once, which was obviously scrapped.

See this effect. Lin Feng was overjoyed. Now no matter how much he absorbs the light-colored topaz, he cannot increase his energy, but this Jinkula can transmit energy to Lin Feng's body.

Quickly took out the doomsday watch, Lin Feng found that the network function of the doomsday watch was gone in this underground world. This was not beyond Lin Feng's expectation. It is impossible for the rock layer of more than 1,000 meters to transmit the signal here, not to mention the 100-meter shielding layer.

If the signal can reach here. Then this underground world may have been discovered by humans on the surface long ago, and it is impossible to drag it until today, a thousand years later.

But the combat power index on the doomsday table is still easy to use. Although he can't see the combat power ranking list, Lin Feng can see that its current combat power has reached 19840.

Lin Feng's combat power index was 19,800 before, and it has remained unchanged. The distance from the combat power of 20,000 is only the bottleneck of 200 points.

But after entering here, because it can gradually absorb the energy of the sun in the sky. As well as the energy from the statue of Agula that was irradiated on Lin Feng's body before, I remember that it was almost 30 points. And after absorbing this treasury just now, Lin Feng's combat power increased by another ten points.

Lin Feng is now at the bottleneck stage of a level 7 cultivator. If he can break through this bottleneck, he will be able to reach a level 8 cultivator.

But this bottleneck is difficult to improve. No matter how he absorbs the crystals produced by the zombies, Lin Feng can't get energy from them. He didn't expect that he would increase his combat power by 40 points within two hours in this underground world.

If this continues. Or collect more gold kula, Lin Feng is very likely to be promoted to a level 8 practitioner soon. At that time, he will become a real strong man.

In the surface world, Lin Feng had never seen a cultivator above level 8 appear. Yang Tianlong is the most powerful cultivator he has ever seen, if not for that, he would not be able to jump off the cliff.

And in this underground world, Lin Feng saw four powerful existences whose strength he could not detect. In this way, Lin Feng, who originally felt that his strength was not bad, suddenly felt oppressed.

If those four people were enemies with Lin Feng, she would probably die here today. Fortunately, the other party was only trying to prevent the people here from going out, and did not hurt Lin Feng.

But even so, Lin Feng became more and more anxious to become stronger. But fortunately, Lin Feng has found this way to break through the bottleneck. I believe that in the near future, he will definitely become a level 8 practitioner.

Before that, he needs to understand the situation of this underground world first. You can't move around rashly, although apart from the four unfathomable guards before, Lin Feng has never seen anyone stronger than him appear. But in a strange place, you still have to be cautious, who knows when a strong man will appear. If you don't even understand the basic situation of this underground world, unknown dangers may occur.

Now Lin Feng has money worth one treasury kura. If it is exchanged for copper kura, it will be 10,000. This is already a considerable sum for Lin Feng who has just arrived in the underground world. He knew before that a steamed stuffed bun was only worth one copper kula, and the money was enough for him to spend for a while.

Only now did Lin Feng feel that his jade bracelet was sold cheaply. This place was originally an underground world, rich in minerals. And the price of emerald is not expensive here.

According to the general calculation, one bun is one copper kula, then the price of the bracelet should be 80,000 copper kulas, which is eight gold kulas. And the middle-aged man only gave Lin Feng two gold kuras, which explained two problems.

If it wasn't for the middle-aged man Hei Linfeng, it would be that jadeite is not that valuable in the underground world, because the output is relatively large, and the price has shrunk somewhat.

If I had known about Lin Feng earlier, I would have changed something else, but now that it has become a fait accompli, there is nothing Lin Feng can do about it.

Fortunately, the money was enough for Lin Feng, so for the next time, Lin Feng walked on the street looking for a lively place to learn about the underground world.

After walking for a while, Lin Feng found a restaurant. The plaque was a bit worn out, but there were quite a few people coming in and out.

Immediately Lin Feng walked towards the small restaurant. (To be continued.)