Although the formation has no sign of this era when the spiritual energy revival has just begun, in ancient history, there have been prototypes of formations that can be used completely.

The Bagua of Zhouyi is the ancestor of all formations.

Gan, Kun, Zhen, Xun, Kan, Li, Gen, Dui.

All formations are established on this technique.

Therefore, among all the knowledge Meng Yun has obtained, formations are the easiest to master, but they are also the most difficult to master.

The spirit gathering array that Meng Yun now wants to arrange under the entire cram school classroom is the simplest entry-level of all Meng Yun’s memories.

The materials needed are also very simple, four fairy crystals with sufficient spiritual energy.

This kind of ore was the most ordinary rock before the spiritual energy revived, but after the spiritual energy revived, some rocks began to mutate and evolved into the current fairy crystal.

However, no one can tell clearly what the principle of this mutation is, because there is no law that has traceability to follow in the mutated rocks.

Sometimes, the most common sedimentary rocks, large tracts of pebbles, have become fairy crystal mineral veins. Sometimes, very rare stones cannot see any mutated shadows, and they cannot summarize any rules at all.

However, with the efforts of scientific researchers, the use of fairy crystal has become wider.

Because of its spiritual energy and its huge reserves, researchers began to study the use of it as energy, hoping to resolve the energy crisis. At the same time, they were also sought after by most monks for cultivation or as refining tools. Therefore, the immortal crystal has also become a hard currency that is stronger than gold.

When it comes to setting up a formation, fairy crystal is an indispensable material!

Fairy crystals are not difficult to buy. Because of their special nature, the Immortal Alliance officially promulgated laws that all fairy crystals must obtain officially recognized qualification certificates and approval documents, but these documents are not difficult to handle. They have obtained qualifications in many merchants, and even various brands emerge one after another.

When I came to the mall, there were all the shops selling fairy crystals.

"Is this monk here to buy fairy crystals? The fairy crystals in our Xundao Pavilion are guaranteed to be large and full of spiritual energy. And there is a 20% discount when entering the store today. Let's choose one!"

As soon as I entered this floor, many salesmen immediately surrounded me and enthusiastically introduced Meng Yun. That look, I really wanted to drag Meng Yun to his store.

However, Meng Yun, a wealth fan, would definitely not be so at the mercy of others. He completely ignored these sales and walked towards the innermost part with Nannan.

If you are fooled by these salesmen, you might have to bleed heavily. Meng Yun would not do this.

After visiting several shops, Meng Yun walked out of it in extreme disappointment.

Many fairy crystals in the shop cannot satisfy Meng Yun.

"Name: Lower Immortal Crystal.

A star of treasures.

Reservation of spiritual energy: 10%.

"Name: Lower Immortal Crystal.

A star of treasures.

Reservation of spiritual energy: half."

Many fairy crystals in the store are inferior products that cannot be seen by Meng Yun, but these profiteers have prideedly putting the best and sufficient reserves on these fairy crystals. However, as long as you take a look, Meng Yun can master all the products of this fairy crystal at first glance.

According to its spiritual energy reserve, immortal crystals are divided into three levels: upper, middle and lower levels. One to 30% are lower levels, 40% to 70% are medium levels, and more than 70% are high levels.

In this mall, most of the fairy crystals are inferior, and there are only a few medium fairy crystals, and the price is even more outrageous, one of them costs more than 200,000 yuan.

Even so, there are many monks who buy fairy crystals here. Meng Yun walked along the way and saw many people buying inferior fairy crystals with a reserve of only 10% or 20% as the best price under the trick of sales.

Actually, it is not surprising that the spiritual energy reserve of Xianjing depends on very professional instruments or the stingy vision that has been in contact with Xianjing for a long time. This is just like the antique industry before, and I have taken a sensible job.

Meng Yun shook his head. There is an important condition for setting up the formation, that is, the fairy crystal used must be a top-class fairy crystal with abundant spiritual energy. Even if it is not a full-scale fairy crystal with a reserve of 100%, it must reach at least 70% or 80%.

Otherwise, using the formation constructed by low- or medium-sized immortal crystals will not only easily destroy and hurt people, but even if it is forcibly constructed, it will not last long, so you must not put it in.

"Dad, Nannan wants to eat that!" Nannan pulled Meng Yun's hand and pointed to a snack stall not far away and said.

It seems to be a seller of marshmallows, and all kinds of colorful marshmallows are definitely very attractive to children.

Meng Yun nodded: "Okay, Dad will buy it for Nannan now."

After a while, Nannan held up a marshmallow larger than her little head and ate while walking.

Meng Yun planned to take Nannan away and go to the next mall to take a look. However, as soon as he left the mall, a man with an extremely vulgar expression came over and looked at Meng Yun flatteringly: "Sir, you are going to buy fairy crystals, right?"

Meng Yun glanced at this guy and slightly protected Nannan behind him. The man in front of him had the sixth level of meridian opening. If he really started a sudden attack, Meng Yun must ensure Nannan's safety as soon as possible.

"What's wrong with you?"

The vulgar man looked around, then whispered: "This monk hasn't found any good immortal crystals. In this way, I have a purchase of goods here. Should monks come and take a look?"

Meng Yun suddenly realized that this guy was probably a fairy crystal dealer who illegally reselled fairy crystals.

Although the various procedures for selling fairy crystals are not difficult and the threshold is not very high, once these procedures are completed, all sales of fairy crystals will be supervised by the Immortal Alliance, and every transaction will be charged a considerable tax by the Immortal Alliance.

The profit of Xianjing can definitely be described as huge profits. In the face of huge profits, there are definitely not one or two people who take risks.

That's what the guy in front of me is like.

Meng Yun thought for a while, then raised his head and said, "Lead the way."

"Okay."

After a while, the vulgar man took Meng Yun to a very ordinary residential building and knocked on a door, and a middle-aged woman inside opened the door.

“Come in, come in.”

Meng Yun entered the house. There was no one else in the house except middle-aged women and vulgar men. In the living room, there were a large bag of fairy crystals piled up, all wrapped in shatter cloth.

"My monk, please choose. Regardless of the spiritual energy reserves of my immortal crystals, each 50,000 yuan, you will take away all the ones you choose!"

The vulgar man waved his hand and tried hard to feel bold, but his vulgar appearance could not feel the word bold.

Meng Yun nodded and began to choose. Nannan stood aside, eating marshmallows, while curiously looking at the bumpy stones.

Compared with the fairy crystals in large shopping malls that are polished into round or water droplets by merchants, the fairy crystals here are wrapped in plastic cloth without any treatment, looking at the potholes, making people feel the urge to think about the plate...

At first glance, it was the fairy crystal that had just been mined from the ore veins, and it was directly taken over by the vulgar man.

Although the vulgar man said how cheap it was for 50,000 yuan per yuan, in fact, this pile of immortal crystals was collected from miners who were ordinary people, and they couldn't even use ten thousand yuan.

No matter how much you sell, the wretched man will make a huge profit.

But even so, these fairy crystals are much cheaper than those in the mall.

Meng Yun saw a lot of medium-sized fairy crystals, 50,000 yuan per piece is really cheap.

However, this still did not meet Meng Yun's requirements.

Seeing Meng Yun shook his head secretly, the vulgar man's expression immediately changed: "Didn't the monk pick on me?"

“No ideal.”

Meng Yun was not vague. After saying this, he was about to take Nannan away.

The vulgar man immediately said, "Wait, I didn't expect that the monk had a high vision. I'm still a little bit like this, you can take a look."

As he said that, the vulgar man immediately opened the bathroom door and took out another bag of fairy crystals from the ceiling of the bathroom.
Chapter completed!