Chapter 161

Black beads are produced in the brains of level-2 zombies. Topaz should normally be produced in the brains of level-2 zombies, and black beads will only be produced with a very small probability.

This black bead has no effect on others, and there is no energy fluctuation in it. In the last days, this thing is worthless, even worse than a white crystal.

But this black bead is useful to Lin Feng, the super energy exchange system in the supermarket can be upgraded through the black bead. At present, the upgrade progress bar of the super energy exchange system in Lin Feng Supermarket shows 1 percent, which was used by Lin Feng for the last experiment. A black bead can bring 1 percent progress to the super energy exchange system.

When he was robbed outside the Beishan base before, Lin Feng collected some black beads. Including those produced in today's corpse tide, Lin Feng has a total of 150 black beads on hand. This amount is enough to upgrade the super energy exchange system.

Back in the room, Lin Feng entered the supermarket. Before coming to the super energy exchange system, he put all the black beads into the recovery port of the super energy exchange system without hesitation.

When the super energy exchange system first appeared, those things in it were already very powerful. Among other things, Lin Feng's dark iron bayonet was already extremely sharp, and Lin Feng avoided many dangers with it.

Moreover, the benefits brought to Lin Feng by the bloodline gene in the super energy exchange system are great. Not to mention that his own attributes brought Lin Feng an improvement in agility, it is very strange that the mutant wolf can help him before.

Lin Feng is looking forward to what will happen after the super energy exchange system is upgraded.

A burst of silver light flashed. The progress bar on the super energy exchange system continued to rise, until after the percent was reported, a silver light suddenly appeared. After the silver light passed, the progress bar on the super energy exchange system showed 51/1000.

It seems that the next upgrade will require a thousand black beads to complete. The chances of black beads appearing are small, but the next upgrade would require so many black beads, which made Lin Feng smile wryly.

But now Lin Feng didn't have time to think so much, he hurried to the screen, Lin Feng was going to see what the upgraded super energy exchange system looked like.

As before, there are still several categories in the super energy exchange system. Used to exchange for different kinds of things. But Lin Feng saw that in addition to the original things, there were some new things.

The first is the weapon exchange system. Originally, there were some cold weapons, but now there are some more technological weapons.

Such as nuclear magnetic guns, and frequency shock pulse guns.

Nuclear magnetic guns are more advanced weapons than laser weapons. In the last days, you need 10,000 white crystals. It is a weapon with great lethality, which can even hurt practitioners.

Although the power is huge, most people can't afford it. Not everyone can own 10,000 white crystals. Only a few practitioners can barely have so much money. Therefore, it is almost impossible for ordinary people to use nuclear magnetic guns to kill practitioners. The threshold of the nuclear magnetic gun is too high, and it is simply beyond the reach of ordinary people.

In the super energy exchange system. This kind of nuclear magnetic gun needs one hundred yellow crystals. Although the price is similar to the market price, there is still a difference.

The number of nuclear magnetic guns in the last days is very small, and few people can sell them. Sometimes even if you have money, you may not be able to buy it. This is like the limited-edition weapons of Lin Feng's previous life, the quantity is very small, and it is not easy to buy. Otherwise, Feng Yi, the former leader of the Dongshan base, bought 100 nuclear magnetic guns with 1 million white crystals. It is still very effective for improving the strength of the base.

Due to the extremely small number, the price of nuclear magnetic guns has even doubled in the black market of some bases. But due to the high price, few people will spend money to buy this weapon.

But Lin Feng is different, the price in the super energy exchange system is fixed. And based on past experience, there is no limit to what can be exchanged.

That is to say, Lin Feng can exchange the nuclear magnetic gun at the price of one hundred yellow crystals in the super base system without restriction, and then sell it at a higher price. That way, a lot of money can be made.

But Lin Feng didn't want to do this. Although he said that would make money, it would circulate nuclear magnetic guns in the market. It is not necessarily a good thing for such a powerful weapon to be circulated.

But Lin Feng still exchanged ten nuclear magnetic guns and put them in the doomsday watch, just in case.

Strange to say, things in the supermarket cannot be taken out of the doomsday watch, but things taken out of the super energy exchange system are an exception. Lin Feng had experimented before that the potions exchanged from the super energy exchange system were not counted as times, and could be taken outside at will.

And the frequency shock pulse gun is indeed a wonderful thing. It will not cause any damage to the human body and zombies, but it has great power against buildings. Under the power of the frequency shock pulse gun, the walls of the general base will be shaken down by this weapon.

Frequency shock pulse gun is not something in this world, Lin Feng has never heard of this weapon before. But there is this thing in the super power exchange system, which is an exception.

Although Lin Feng really wanted to exchange for a frequency shock pulse gun, and then use it to destroy all the walls of the Dongshan base. But the price of this kind of weapon is really too high, it costs 10,000 topaz. Although he really wanted to get it, Lin Feng could only stop there.

At present, Lin Feng only has more than 31,500 yellow crystals in his hands, of which 30,000 yellow crystals were exchanged for diamond rings at the Tianlong Base. The other 1,500 yellow crystals were obtained from the corpse tide just now. And after exchanging those ten nuclear magnetic guns, only 500 of the fifteen hundred yellow crystals remained.

It's not worth spending so much topaz just to collapse the opponent's wall.

Lin Feng just sold a batch of diamonds, so he probably hasn't digested them yet. If he went to Shenwu Auction House to exchange diamonds for yellow crystals at this time, the possibility was somewhat unlikely.

Lin Feng wants to spend his money wisely, this kind of weapon is a bit too extravagant for the current Lin Feng. What he needs most now is to improve his own strength, even if he can't reach the level 8 cultivator at once, he must become the best among the 7 level cultivators. Otherwise, facing other advanced practitioners, Lin Feng would still be in danger. Only by ensuring one's own strength can one survive in the last days.

Immediately afterwards, Lin Feng discovered a weapon in the weapon interface on the super energy exchange system. When Lin Feng saw this weapon, his eyes immediately brightened. This weapon gave him a feeling of deja vu. (To be continued.)