The black castle is a hundred miles long, and the four walls are integrated, without a special formula, the four walls will not be opened at all, unless they are forcibly broken, but the owner of the demon secret realm was able to build this black castle, which fully shows that the four walls are extraordinary, if others can break it only by violence, then this black castle will not stand for so long and still be the same.

For this reason, even if this secret realm is discovered by the human race or the demon race, it cannot be forcibly broken, which provides a good buffer for the demon race to find out when the world, and it is precisely because of this that Zhou Fool has discovered the secret realm for many years, but he has not been swept away, because he has no way to start.

"This city wall is very powerful, do you have a way to forcibly break it?" Ye Ren said worriedly, standing under the city wall, feeling the endless sense of oppression given by the city wall, he knew that this city wall was only afraid that even the Yuanying Monk could not forcibly break it.

"Everything has flaws, let alone a wall, and it is a wall that has lost its owner, and it is only a matter of time before it collapses. Sha Xin smiled, maybe because she was a person who survived the ancient era, coupled with the influence of the Heavenly Court Alliance, she has become very powerful now, at least in terms of mentality, she is much stronger than Ye Ren.

"Hehe, okay, then it depends on Brother Zhou's preparation. Ye Ren nodded, if he said that the biggest killing weapon in the world was, then he would not hesitate to choose time, because time is a sharp weapon, constantly corroding everything, even if it is a powerful Yuanying Monk, in front of time, it is not worth mentioning at all.

So after many eras, coupled with the ownerless state, although this black castle is still so powerful, it is not as powerful as imagined.

Of course, all this still depends on the preparation of Zhou Fool, even if the city wall has become extremely weak, it is also an insurmountable gap for Ye Ren and the others. Therefore, they all need the plan prepared by Zhou Fool in advance, otherwise they will really break it forcibly, with the rebound power of the city wall, let alone breaking the city wall, it will be difficult to survive.

Everyone has also seen the lessons of Qianjing, so no one is stupid enough to break down the city wall with violence.

"If this wall is forcibly broken, I am afraid that it will not be broken at all in a hundred years, although we have found some flaws, but because the four walls have been fused into one, we can only come soft if it is hard." Zhou Fool clapped his hands, only to see a group of alchemists in the back walk out, and then took out a lot of bits and pieces from the storage ring, because they were afraid of accidents on the way, so each of them took out the same thing, which was also to ensure that at least one alchemist could take out a complete thing.

One of the most special things is that they took out a pile of black stones, which looked very mysterious.

"What is this for?

Sha Xin and Ye Ren both looked at this group of alchemists in confusion as if they were busy, and feeling the unique aura of the alchemists, Sha Xin and Ye Ren both felt like demonic energy, because Zhou Fool said that this city wall must be opened with demonic energy.

As for why Sha Xin knew, it was because the era she lived in back then was the era of war with the demons, so she could feel that it was purely normal, and Ye Ren could feel it, it was also because of the mysterious and terrifying demon clan that he felt in the secret realm back then, so he could also feel the unique aura of these alchemists for the first time.

"There is a big difference between demonic energy and aura, originally according to the original plan, we formulated two plans, one is to capture a second-generation demon, and the other is to use the technology we have mastered to create demonic energy. However, due to the rush of time, we had to implement the second option. Zhou Fool explained, capturing a second-generation demon has always been a major task for them, and studying the dead demon clan is never as good as studying the living demon clan, but the realistic plan can't catch up with the changes, and the awakening of the secret realm has disrupted everything.

"Then is the demonic qi you created genuine?" Ye Ren said with some concern as he looked around at the Black Castle.

"Spirits have spirit stones, demons have magic stones, and if there are spirit stones, we can create spiritual energy, and in the same way, with magic stones, we can also create pure magic energy. Zhou Fool said.

"Magic stones? It's this pile of stones, no wonder they look familiar!" Sha Xin picked up one of the stones from the pile of stones in front of the alchemists, squeezed it in his hand and sighed, "It's really a familiar taste." ”

"Then how does this thing open this sword-like city wall?" Ye Ren also picked up a magic stone and looked at it, "Is it just a matter of transforming into demonic qi?"

This is definitely a big doubt for people who are not alchemists, these city walls can't always open the door as soon as they encounter demonic energy, you must know that the heavens and the earth are full of all kinds of energy, in addition to the aura that the human race and the demon race can control, there is also the demonic energy that the demon race can control, but why are these city walls still standing still? This is an unsolvable problem for everyone, at least for those who are not alchemists.

"That's different, if you want this wall to open obediently, it must be pure demonic energy, and it is a large amount of demonic energy. Moreover, relying on magic stones alone to provide demonic energy cannot make this wall compromise. Fool Zhou smiled mysteriously, this was also what they were proud of, because this wall could only be opened by his alchemist group, and other people, even if there were many people, as long as they did not have the assistance of the demons, they could not open this wall.

"In order to keep it a little attractive, so this explanation is better left to your eyes, and you will know what is going on when you look carefully. ”

"Then we'll see. ”

Ye Ren and Sha Xin didn't ask any further, if the alchemists had a way to make the impossible possible, then of course they would be willing to see it for a long time, after all, if it was easy to use, they could also find Zhou Duzi to borrow some people next time to help solve some problems. So for this kind of thing, they are very willing to make Zhou fool snort.

Of course, the premise is that these alchemists are really so easy to use, if it's just decoration, let alone borrowing people, Zhou Fool is afraid that he won't use these people anymore, so it all depends on whether the city wall can be opened or not.

While all eyes were on the busy alchemists, everyone was stunned by the dazzling experiments of the alchemists, and when they looked around, they were all bottles and cans, although they didn't know what they were beating drums, but they just felt amazing.

Just like the Heavenly Beasts of the Heavenly Court Alliance and the Iron Eggs of the Demon Alliance, no one will study who they come from, all they care about is the power and practicality they bring, but it is precisely because they know nothing that everyone feels extremely magical and shocked by the Heavenly Beasts and Iron Eggs.

"What is this doing?" Looking at the several distinctive figures in the alchemist group, who were busy beating some iron tools, as if they were beating something, Ye Ren couldn't help but ask suspiciously.

"A very important little thing, it is because of them that we can be sure that we can open the city wall. Zhou Fool said after selling a pass.

"You've had a lot of fun today, and we won't continue to take risks with you if we don't have a satisfactory outcome. Sha Xin saw Zhou's smug appearance, and immediately threatened.

"Don't worry, I'll surprise you later. Zhou Fool said confidently.

"Hopefully. ”

As for the content of the chat between Zhou Fool and Ye Ren and others, the alchemist group heard it clearly, and they were not deaf, so they were all more busy with their hands. In many people are serious, alchemists are the weakest and useless path, in this era of strong people like clouds and strength is respected, fists can decide everything, but what alchemists beat out of the drum can basically be judged as chicken ribs, which also leads to the low status of alchemists, and there are very few people who take this path.

But Zhou Fool found them in a different light, and even reused them, each of them was very grateful to Zhou Fool in their hearts, and they didn't want to embarrass Zhou Fool.

"Slow down, don't be rash, your face is earned by yourself, if you want to surprise others, then be steady. Fool Zhou seemed to see a state of the alchemist group, and hurriedly reminded. Others don't know what their situation is, but he knows that there is no room for even the slightest mistake.

"Yes, don't have emotions, every road is powerful, since Brother Zhou can see your shining point, then one day, you will become a thousand rays of light, shocking all eyes. Ye Ren encouraged, he is a guy who likes to go out of the way, although he can't understand the path of an alchemist, but it is recorded in ancient books that the powerful alchemist is also an extremely terrifying existence, but he has been abandoned by more choices and better choices.

With Zhou Duzi's order and Ye Ren's encouragement, the entire alchemist group once again entered a state of selflessness, as if the whole world had nothing to do with it, and the high concentration and fanatical expression made people feel a lot of respect.

Soon, a refreshing one-man tall iron cabinet was made, which felt worthless on the surface, but when it saw the dazzling array of parts in the belly of the iron cabinet, no one would think that this iron cabinet would be a pile of scrap metal. On the contrary, everyone was full of anticipation, expecting a shocking miracle to appear in this iron cabinet.

"We named it the Magic Cabinet because it was like a demon man, as long as there were a few much-needed necessities, it could produce a steady stream of pure demonic energy. Zhou Fool introduced.

After speaking, Zhou Fool picked up a bottle of strange liquid knocked out by the alchemists, poured it lightly into a pipe of the magic cabinet, and said with a smile: "This is the demon blood, with the demon blood, the magic cabinet will come to life." ”

Buzz——

Perhaps because he was afraid that everyone would not believe it, after absorbing the demon blood, the magic cabinet was very cooperative with the buzzing and trembling, and those parts also turned in an orderly manner under the shock of everyone.