Time flies, and half a year has passed in a blink of an eye.

In the past six months, Zhang Sen has completely abandoned his cultivation, and his whole person is immersed in the vast and boundless knowledge of the Book of Truth.

He lived so much that his brain was like a sponge constantly sucking in seawater, and finally he realized that he couldn't understand what was going on, so he stopped reading.

Wizards, who have always been well-read and memorized.

A wizard who has lived for a thousand years is basically equivalent to a moving library, and a wizard who has lived for 10,000 years is synonymous with horror, and even scholar-type wizards have unimaginable means and hole cards to live to this year.

Zhang Sen didn't have a teacher to teach, he embarked on the path of wizards through self-study, and the only thing that could be used as a reference before was the dead necromancer, so his path was very wild.

Now that he has obtained the Book of Truth, it is like getting a formal textbook, and he has finally truly stepped into the world of wizards.

Zhang Sen carefully closed the Book of Truth and put it in the dimensional safe, and then he left the study and headed for the laboratory.

To be honest, he has been exposed to too much theoretical knowledge in the past six months, and now this knowledge is in his mind, and all he needs to do is to transform it into strength.

The first thing he has to do is prepare the materials, there are many special spells that don't really have much learning value, but the process of using them has a huge improvement in his personal realm.

For example, the Sound Transmission Technique, which is only a Level 1 spell, can construct a mana channel to transmit sound to a specified object.

The problem is that this mana channel can be easily intercepted by the enemy, so no wizard will use this spell at all, but this spell is the basis of Shingon Technique, and if you can learn this spell, then it will be much easier to learn Shingon Technique.

There are many similar cases, and even several completely chicken spells are mixed together to form powerful spells.

Zhang Sen already knew how to learn these spells, but to use them required some materials, so he had to find a way to get them.

Upon entering the lab, he retrieved a piece of space debris, followed by a full-length mirror.

He quickly used space debris to arrange a special mirror space on the full-length mirror, and then the whole person drilled into the mirror, and constantly marked a series of spell marks in the space inside the mirror, each of which contained different coordinates.

To be honest, if he hadn't read the Book of Truth, he probably wouldn't know how wizards traded until much later.

Wizards tend to live in isolation, and the more powerful they are, the more they prefer to live alone, and they tend to hate dealing with all kinds of relationships.

While there are a handful of wizards who like to burrow into crowds, at least most wizards are lone explorers who only step out of their towers when they need to gather materials for experimentation.

Later, several god-level wizards felt that this was too much of a waste of time, so they created a spell together, which was the Mirror Realm Trading Technique.

The so-called mirror world is the time in the mirror, which is a reflection of the real world, and each wizard can use the mirror world trading technique to build his own shop in a mirror, and the coordinates are waiting for the guests to come.

Because many wizards are murderous, these god-level wizards used three god-level spells in the mirror world to form three major rules: to eliminate identity snooping, to prevent mutual attacks, and to eliminate coordinate peeping.

In order to ensure the effectiveness of the spells, they are said to have invited a terrifying powerhouse to strengthen the three spells in the mirror realm, so when it comes to transactions between wizards, the mirror realm can be said to be the safest place.

Because the Strange Jaw Wizard was originally a wild man, he didn't know the information about the Mirror Realm Trading Technique, and naturally the dead necromancer didn't know the Mirror Realm Trading Technique.

If Zhang Sen hadn't obtained the Book of Truth, it would have taken a long time or even a lot of money to know the existence of the Mirror Realm.

Therefore, Zhang Sen was able to meet the Yellow Emperor, which was actually considered lucky.

Zhang Sen built his Mirror Realm space into the appearance of a grocery store, and then took out a door and installed it on the space barrier, and continued to cast spells to connect the gate with the Mirror Realm.

The mirror realm is actually a very long road, whenever there is a wizard to set up the realm space, then the road will extend ten meters, and these ten meters belong to the wizard's façade.

In fact, it was originally necessary to charge for setting up a façade in the mirror world, but later the terrifying existence strengthened the three major spells for free, so that the fee was waived, what was going on, Zhang Sen didn't know, but this was good news for him.

After setting up the gate, he put on his mask and black cloak, opened the door and walked out.

To his left was a twisted space, and to his right was a long road with no end in sight.

There are many doors of different shapes on this road, and if they are opened, they will open automatically as soon as they are close to the past, and if they are not opened, they will remain closed.

Zhang Sen took a deep breath and walked towards the road.

Apparently the shops near his shop were all new and unprepared, and the door didn't open when he walked by.

He kept walking forward, and gradually began to see people, these people were dressed similarly to him, all of them were wearing black cloaks, their faces were either wearing masks or using spells to cover them, and some were even more eccentric, they didn't seem to care about revealing their true colors at all, but their true faces gave Zhang Sen the feeling of human skin. Mask.

There were more and more people, and Zhang Sen finally saw the shop that opened its door to do business.

He walked into a shop that was very dark and full of all sorts of oddities.

"Guest, what do you need?"

At this time, a frog at the front desk of the store asked.

Zhang Sen noticed the frog and said, "I need some spell casting materials, I don't know how to trade?" ”

"Is this the first time you've come to the mirror world?" The frog's two scarlet eyes stared at Zhang Sen and asked.

Zhang Sen nodded and said, "It's really the first time I've come, I don't know if the rules here have changed, or do you use magic stones to settle the settlement?" ”

"Settle with magic stones? The guest was talking about several things before the end of the era, and now everyone is trading with the common currency of the nine worlds, 'Yongyuan'. The frog looked at Zhang Sen and said.

Zhang Sen nodded and said, "Is bartering acceptable?" ”

"Sorry, we don't accept barter, but you can take things to our store and sell them." The frog replied.

Zhang Sen nodded, then politely thanked the frog and turned to leave the shop.

He then visited several shops and finally figured out the current trading pattern of the mirror industry.

The so-called nine worlds are actually superpowers born before the end of the five epochs, and it is said that a powerful unimaginable power integrated these nine worlds and established a country based on these nine worlds, the name of this country is the eternal country, and the common currency in the country is the eternal currency, referred to as Yongyuan.

It is the world that all cultivators dream of, with countless cultivation resources and unimaginable powerhouses sitting in the city.

Nearly nine-tenths of the wizards in the multiverse live in the Eternal Kingdom, and naturally, the transaction mode of the Mirror Realm has also changed, gradually changing from only collecting magic stones to only collecting eternal yuan.

Yongyuan is a gold coin-like currency with the head of a handsome man engraved on it, and a dragon depicted on the other side, with the word 'forever' in the middle of the dragon.

This currency itself has no special use, unlike magic stones that can assist in cultivation, but it has a feature that can guarantee that it cannot be imitated, and that is that it cannot be destroyed!

No matter what means, Yongyuan can't be destroyed, and even a local tyrant once used Yongyuan to make an armor, which has an amazing defensive power, if there is no gap, it is definitely an invincible armor.

Zhang Sen basically only watched and didn't buy along the way, and kept inquiring about all kinds of information.

This information is not confidential information, it is common knowledge that most wizards know, although the clerks in these shops see that Zhang Sen is a poor ghost, but they are still willing to tell Zhang Sen this information, after all, wizards have a long lifespan, who knows what height Zhang Sen will grow to in the future.

Zhang Sen also found that these stores rarely encounter shopkeepers.

The shopkeepers here are all wizards, and most of the time they stay in the laboratory doing experiments, so how can they waste time looking at the shop.

So under normal circumstances, the people who watch the store are either wizard apprentices or some alchemy puppets, and even undead exist.

Although the necromancer is an existence that everyone shouts about, the mirror world can shield identity prying eyes, and most customers can't do anything even if they know that the store is opened by a necromancer, and the time of the transaction will not change because the other party is a necromancer.

There is also the purchase of items in the store, and the price is really black.

Zhang Sen saw in a store that the price of space debris was 10 Yongyuan, but the price of the store recycling was 10 Yongyuan.

In the end, he determined one thing, if he wanted to buy materials for experiments, the first thing he had to do was to make money!

If he sells something to a store, it won't help him even if he throws his whole wealth into it.

But now he is not in a hurry, since he has decided to mix in the mirror world, the first thing to do is to conduct market research, figure out the rules here, and at the same time figure out the prices.

There is a characteristic of the streets in the mirror world, and Zhang Sen only found it when he walked, that is, the further he walked, the more people came, which showed that the shops in front of him obviously had greater advantages.

Then the question arises, how can a store like his survive because no one goes to the location where his store is located!

Eventually, he came up with a solution, which was to unite with other shops.

If the customer wants to buy something that these stores do not have, then he can introduce his shop, and if he sells the goods, then he will give the introduced shop a profit.

He returned to the castle to make a plan, and after making sure that there were no loopholes, he took the plan and went to the mirror world again.

However, he was devastated, and almost all the stores rejected his plan.

The only thing that lifted his spirits a little was news.