Black beads are produced from the brains of level 2 zombies. The brains of level 2 zombies should normally produce citrine, but there is only a very small chance that black beads will be produced.
This black bead has no effect on others, and there is no energy fluctuation in it. In the end of the world, this thing is worthless, even worse than a white crystal.
But this black bead is useful to Lin Feng. The super power exchange system in the supermarket can be upgraded through black beads. Currently, the upgrade progress bar of the super power redemption system in Lin Feng's supermarket shows one percent. That was Lin Feng's last experiment. A black bead can bring one percent progress to the super power redemption system.
When he was robbed outside the Beishan base before, Lin Feng collected some black beads. Including those produced in today's zombie wave, Lin Feng had a total of one hundred and fifty black beads on hand. This amount is enough to upgrade the super exchange system.
Back in the room, Lin Feng entered the supermarket. When he came to the super exchange system, he put all the black beads into the recycling port of the super exchange system without hesitation.
When the super exchange system first appeared, the things in it were already very powerful. Not to mention anything else, Lin Feng's dark iron bayonet alone was extremely sharp, and Lin Feng avoided many dangers with it.
Moreover, the benefits brought to Lin Feng by the bloodline gene in the super power exchange system are huge. Not to mention that his own attributes have improved Lin Feng's 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 power exchange system is upgraded.
A burst of silver light flashed, and the progress bar on the super power exchange system continued to rise. After reaching the 100% report, the silver light suddenly appeared. After the silver light passes, the progress bar on the super exchange system displays 51/1000.
It seems that the next upgrade requires a thousand black beads to complete. The probability of black beads appearing is small. I didn't expect that the next upgrade would require so many black beads, which made Lin Feng smile bitterly.
But now Lin Feng didn't have time to think so much. He quickly came to the screen and was ready to see what the upgraded super power exchange system looked like.
As before, there are still several categories in the super power redemption system, which are used to redeem different types of things. But Lin Feng saw that in addition to the original things, there were also some new things.
The first is the weapon exchange system. Originally, there were some cold weapons, but now there are some more technological weapons.
For example, nuclear magnetic guns and frequency shock pulse guns.
A nuclear magnetic gun is a more advanced weapon than a laser weapon. In the apocalypse, one would cost 10,000 white crystals. It is an extremely lethal weapon that can even hurt practitioners.
Although it is powerful, it is absolutely beyond the reach of ordinary people. Not everyone can own ten thousand white crystals. Only a few cultivators can barely have such a lot of money. Therefore, it is almost impossible for ordinary people to use nuclear magnetic guns to kill cultivators. The threshold for a 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 requires one hundred topaz. Although the price is similar to that on the market, there is still a difference.
The number of nuclear magnetic guns in the apocalypse 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 those limited edition weapons from Lin Feng's previous life. The quantity is very small and cannot be bought casually. Otherwise, Feng Yi, the former leader of Dongshan Base, used one million white crystals to purchase one hundred nuclear magnetic guns, which was very effective in improving the strength of the base.
Due to the extremely small quantity, the price of nuclear magnetic guns has even doubled several times on the black market in some bases. But because the price is too high, few people will spend money to buy this weapon.
But Lin Feng is different. The prices in the super exchange system are fixed. And based on past experience, there is no limit to what can be exchanged.
In other words, Lin Feng can exchange the nuclear magnetic gun for a hundred topaz in the super base system without restrictions, and then sell it at a higher price. That way, you can make a lot of money.
But Lin Feng didn't want to do this. Although it would make money, it would make the nuclear magnetic gun circulate on the market. The circulation of such a powerful weapon is not necessarily a good thing.
But Lin Feng still exchanged ten nuclear magnetic guns and put them in the Doomsday Table in case of emergency.
Strangely enough, items in the supermarket cannot be put into the Doomsday Table and taken out, but items taken out from the Super Power Exchange System are an exception. Lin Feng had experimented before. The potions exchanged from the super power exchange system did not count as the number of uses and could be taken outside at will.
The frequency shock pulse gun is indeed a strange thing. It will not cause any harm to the human body or zombies, but it is very powerful against buildings. Under the power of the frequency shock pulse gun, the walls of the general base will be collapsed by this weapon.
The frequency shock pulse gun is not something in this world. Lin Feng has never heard of this kind of weapon before. But there is this thing in the super exchange system, which can be regarded as 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 Dongshan Base. But the price of this weapon is too high, it actually costs 10,000 topaz. Although he really wanted to get it, Lin Feng could only hold back.
Currently, Lin Feng only has more than 31,500 citrines in his hands, of which 30,000 citrines were previously exchanged for diamond rings at Tianlong Base. The other 1,500 topaz were obtained from the zombie wave just now. After exchanging the ten nuclear magnetic guns, only 500 of the 1,500 topaz were left.
It's not worth spending so much topaz just to knock down the opponent's wall.
Lin Feng just sold a batch of diamonds, and he probably hasn't digested it yet. If he were to use diamonds at Shenwu Auction House in exchange for topaz at this time, the possibility would be somewhat slim.
Lin Feng wants to spend his money on the blade. This kind of weapon is a bit too luxurious for the current Lin Feng. What he urgently needs now is to improve his strength. Even if he cannot reach the level 8 cultivator at once, he must become the best among the level 7 cultivators. Otherwise, Lin Feng would still be in danger when facing other advanced practitioners. Only by ensuring your own strength can you live well in the apocalypse.
Immediately afterwards, Lin Feng discovered a weapon in the weapon interface on the super exchange system. When he saw this weapon, Lin Feng immediately felt his eyes light up. This weapon gave him a feeling of déjà vu.
(End of chapter)