When Chen Yun heard this, he thought to himself that the silver-robed monk must be the Elder Wang mentioned by the white-robed middle-aged man.

He quietly used his spiritual sense to sweep around and realized that the other person was an early Nascent Soul cultivator, but his face was a little pale, and the paleness was a little abnormal. He thought it was because the magic formula he practiced was quite special.

Chen Yun smiled and returned the greeting:
"You are too polite, Brother Wang. I have heard of the great name of Tianji Pavilion for a long time, so I came to visit you specially."

"Fellow Daoist Chen wants to exchange the Tianji Palace. That's really a big deal. The saying that there are many treasures overseas is true." Upon hearing this, the old man surnamed Fu exclaimed in surprise.

"Although there are rare things overseas, they are still not as good as the vastness and abundance of the inland areas. You two Taoist friends are wrong."

Chen Yun responded calmly, with a hint of reservation in his tone.

Although Chen Yun's words failed to completely dispel the doubts of the two Nascent Soul cultivators, considering Chen Yun's identity as a high-level cultivator.

They also dared not to inquire further into overseas affairs for fear of being misunderstood as having prying intentions, which would be very serious.

At this time, the middle-aged man named Zhao behind the silver-robed monk stepped forward and respectfully placed the two jade boxes, one large and one small, in his hands on the table in front of Chen Yun, and then tactfully stepped aside.

He knew it very well. Now that Elder Wang in the pavilion had come forward, there was no need for him to say anything more.

"Since Fellow Daoist Chen is interested in our Tianji Palace, I have brought this item together with Fellow Daoist Fu's Thunder Spirit Stone. Please take a look at it first." Elder Wang smiled and pointed to the slightly larger jade box, his tone polite and sincere.

The old man surnamed Fu spoke first, suggesting that Fellow Daoist Chen should visit the Tianji Palace later and complete the transaction with himself first.

Elder Wang smiled silently upon hearing this, and expressed his interest in what kind of treasures Fellow Daoist Chen could offer for exchange.

Hearing what the two said, Chen Yun smiled slightly and took out a palm-sized emerald green wooden box with gold and silver talismans attached to it from his storage bag.

When the old man surnamed Fu saw the solemnity of this wooden box, his eyes lit up.

Chen Yun placed the wooden box on the table and pushed it gently, and the box slid silently in front of the old man.

The old man perked up, pressed the wooden box, then flicked his sleeves and handed the other smaller jade box steadily to Chen Yun.

Chen Yun showed a look of satisfaction, took the jade box, lowered his head slightly and opened the lid.

Suddenly, a ball of silver-white light bloomed in the box. Chen Yun's eyes flashed with blue light, and he saw clearly that the object in the silver light was actually a fist-sized silver-white stone.

In the quiet place of cultivation, Chen Yun's gaze lingered on the wooden box in his hand for a long time.

He looked focused, as if everything around him didn't exist and only this object could attract his attention.

After a moment, Chen Yun slowly stretched out a finger, and the fingertips flickered with light. A ray of green light loomed, like a smart elf jumping on the fingertips. As his wrist shook slightly, the green light flashed instantly, and with a sharp breath, it pierced straight at the silver stone in the box that exuded a mysterious aura.

At the moment when the green light touched the silver stone, a deafening thunder suddenly rang out, as if the sky was torn apart by this force.

Then, several slender and bright silver arcs surged out from the stone, like nimble silver snakes, instantly blocking the green light outside.

Chen Yun frowned slightly, exhaled a breath, then slowly raised his head, his eyes revealing a hint of calmness and confidence. He looked at the red-faced old man and said solemnly:
"Yes, it is indeed a thunder crystal. But the quality of this crystal seems to be a little lacking, a little ordinary, which is a pity. However, I can make do with it."

The old man surnamed Fu nodded slightly, with a look of satisfaction on his face. He held the red ginseng in Chen Yun's wooden box in his hand, and after carefully examining it, his eyes flashed with joy that was difficult to conceal.

He smiled and said:

"It's not that easy to get top-grade Thunder Spirit Crystal."

"I went through a lot of hardships to find this spiritual crystal in the belly of an extremely rare thunder-attributed monster."

Chen Yun remained calm, with the corners of his mouth slightly raised, and said softly:

"But this Red Jingzhi of mine is extremely pure, without even a trace of impure spiritual energy. It is definitely a top-grade spiritual medicine."

He secretly calculated in his mind that although he was quite tempted by this Thunder Spirit Crystal, he would not easily agree to the deal, so as not to suffer too much.

The red-faced old man frankly admitted that his Thunder Spirit Crystal was slightly inferior in value to the top-grade Red Jingzhi held by Chen Yun.

In order to make up for the gap, he proposed to pay an additional 30,000 spirit stones as compensation.

Chen Yun showed a calm attitude and suggested that the red-faced old man first check the list of materials in his hand. If the required materials or information about them could be provided, he would not accept the spirit stones.

Then he handed the jade slip containing the materials to the old man.

The old man surnamed Fu took the jade slip and quickly glanced through it, seeming a little surprised.

At this time, Elder Wang on the side became interested in the red Jingzhi in the old man surnamed Fu's hand, and his eyes flashed with thought.

When the old man surnamed Fu finished reading the contents of the jade slip, a strange expression appeared on his face, and he looked at Chen Yun with a hint of hesitation.

I'm afraid I'm going to disappoint you, fellow Taoist.

These materials are extremely rare and I don't have any of them.

However, perhaps I can show you a simple way to obtain these materials. After pondering for a moment, the old man finally made up his mind and said.

"Please give me some pointers. Are you talking about the big auction in a few days?" Chen Yun rolled his eyes and smiled.

"Haha, you can indeed buy common materials at the big auction."

"But the probability of high-level materials like the ones you need appearing is extremely small. After all, most of the fellow Daoists who have rare materials are like you and me, hoping to exchange them for other materials."

The red-faced old man laughed and said with a hint of disdain.

"Oh, from the tone of your voice, could it be that there is some other private transaction going on?" Chen Yun was shocked, overjoyed, and asked hurriedly.

The old man surnamed Fu showed a strange smile on his face, and suddenly his lips opened slightly but no sound came out, but Chen Yun heard the old man's words in his ears.

Brother Chen is indeed a smart man, but this is not a private transaction, but an auction held in Jinjing every ten years.

Over the years, this auction has been divided into two parts: light and dark.

It is well known that the open transactions are held in the market town supported by the righteous.

In the dark, the underground trade fair hosted by the evil sect of the magic way. In the underground trade fair, ordinary items are still auctioned with spirit stones, but for certain materials of certain levels, barter is usually adopted.

Since underground transactions involve many items that are expressly prohibited by the cultivation world, they are essentially shady. Those who can participate in them are mostly cultivators who know each other.

Since you are an overseas cultivator, I'm afraid it might be a little inconvenient.

However, if you agree to the current transaction, I am willing to act as your introducer. I believe you will be able to gain a lot from the underground transaction.

After the old man finished speaking, he stared at Chen Yun solemnly, waiting for his response.

"I see."

Chen Yun frowned slightly, pondered for a moment and asked:

"Brother Fu, are these two underground trade fairs held at the same time? Although I am eager to participate in the underground trade fair, I don't want to miss the big auction."

During a transaction, Chen Yun and the old man surnamed Fu had a clever communication.

Although both took place simultaneously, the auction exchange of rare materials was intentionally staggered by one day.

The old man told Chen Yun that he was not interested in the ordinary items in front, so there was no need to worry about missing anything. Chen Yun agreed and became very interested in the underground trade fair.

The old man surnamed Fu was overjoyed when he saw this.

He told Chen Yun that on the last day of the auction, he only needed to wait in front of the Tianji Pavilion.

This transaction did not use voice transmission, which made the silver-robed monk who was watching on the side feel confused, but he did not show it.

After Chen Yun and the old man received the Thunder Spirit Crystal and Red Jingzhi respectively, the silver-robed monk smiled and spoke.

He congratulated the two fellow Taoists on their gains, and asked Chen Yun whether he planned to visit the Tianji Palace again.

However, he pointed out that one thousand-year-old red essence ganoderma was far from enough to exchange for the treasure of Tianji Mansion.

Although his tone was unusually polite, it implied that the value of Tianji Mansion was far beyond imagination.

"It doesn't matter. As long as this item can really satisfy Chen, I will not be stingy."

Chen Yun smiled faintly, his tone revealing his indifference.

"Since Brother Chen said so, I also believe that with Brother Chen's strong financial resources, it should be easy to take over the Tianji Pavilion."

"Fellow Daoist, please follow me to the mustard seed space specially made for this pavilion and see the restored Tianji Pavilion."

When Elder Wang heard what Chen Yun said, his smile became even brighter.

"Mustard seed space?" Chen Yun's heart trembled slightly, and a look of surprise appeared on his face.

"Why, fellow Daoist, you have never heard of the Xumi Space?"

"Oh, I almost forgot that this secret technique of turning space cracks into private space was only developed by Dajin in the past thousand years."

"It's not surprising that you, Daoist friend, are born overseas and don't know about this."

Elder Wang patted the back of his head, seeming to understand something.

In the world of immortal cultivation, the heaven-defying secret technique of refining space cracks into mustard seed space has already appeared. When Chen Yun heard about this, he could not hide his shock.

The secret art of space has always been of great significance. Even a common storage bag is an application of the secret art of space.

However, no matter how high the level of a storage bag is, the things it can hold are ultimately limited, and it is far from being a mustard seed space in the true sense.

Many cultivators believe that higher-level space mystical arts will never appear in the human world. These are magical powers that can only be performed by cultivators from the upper realms. This is almost a consensus in Tiannan.

However, Elder Wang claimed that the secret technique of refining space rifts had appeared in the Great Jin Dynasty more than a thousand years ago, which surprised Chen Yun greatly.

Upon seeing this, the old man surnamed Fu explained with a smile that the so-called "mustard seed space" was not as profound as Chen Yun thought, and its birth was purely a coincidence.

Brother Fu is absolutely right.

For the vast majority of practitioners, the mustard seed space is actually useless.

The refining process is extremely complicated and there are many restrictions on its use, making it difficult to be widely popularized.

It is said that there are only more than ten such spaces in the territory of Dajin, and the one owned by this pavilion is the earliest one among them.

Elder Wang smiled bitterly and spoke slowly.

The earliest? Upon hearing this, Chen Yun raised his eyebrows slightly, with a hint of suspicion flashing in his eyes.

Yes, this secret technique was actually created accidentally by several weapon-making masters in our pavilion.

Looking around the world, the only ones who can refine this mustard seed space are the two weapon-refining masters in this pavilion.

In fact, in a sense, Tianji House and Tianji Mansion are also secret techniques developed based on the method of refining mustard seed space.

Elder Wang did not hide anything, but told everything.

Hehe, I see. Chen Yun regained his composure and said with a smile.

After discussion, Elder Wang and the old man surnamed Fu decided that Elder Wang would lead Chen Yun to the mustard seed space, while the old man surnamed Fu would leave first as he needed to deal with the red essence ganoderma.

The old man surnamed Fu clasped his fists to the two men and solemnly said goodbye. Seeing this, Elder Wang bowed and said that he would not keep Brother Fu and looked forward to seeing him again in the future.

When the old man surnamed Fu left, he privately told Chen Yun not to miss the important transaction on the last day of the underground trade fair. Chen Yun nodded slightly to show his understanding.

The old man surnamed Fu left the hall without hesitation and walked quickly downstairs.

Elder Wang turned around and smiled at Chen Yun:

"Brother Chen, it's time for us to set off. The mustard seed space is just behind the attic and we'll be there in no time."

After he finished speaking, he waved his sleeves lightly, and the larger jade box on the table disappeared without a trace.

Naturally, Chen Yun would not refuse, so he followed Elder Wang through layers of strict restrictions and came to the open space behind the attic.

In the center of this place, there is a strange teleportation array that Chen Yun has never seen before. Its complexity and scale are far beyond ordinary teleportation arrays. Chen Yun frowned slightly, feeling a little surprised.

In the world of immortal cultivation, the method of entering the mustard seed space is extremely special.

Chen Yun was confused about how to get to the mustard seed space. Seeing this, Elder Wang spoke up to help him understand and told him clearly that the only way to get there was with the help of a teleportation array.

Hearing that a teleportation array was needed, Chen Yun was secretly surprised and pondered secretly about the related secret techniques for refining this space rift.

However, this matter involving the secret technique of refining is rather secretive, so he was not in a position to ask directly.

After seeing the other party step into the teleportation array first, Chen Yun hesitated for a moment and followed him in.

After entering the teleportation array, Chen Yun noticed that there were seven or eight spirit stones placed around it, and they were all mid-level spirit stones.

Just entering the mustard seed space would cost seven or eight hundred low-level spirit stones.

If you still need to use the teleportation array to leave when you return, then the cost of a round trip will be more than a thousand spirit stones.

Such a high cost is really beyond the affordability of ordinary monks.

Just as Chen Yun was thinking in his heart, the spirit stones around the teleportation array suddenly emitted a white light, and then he and another person disappeared in the teleportation array.

After a moment, he felt dizzy. When Chen Yun regained consciousness, he found himself and his companions on a gravel slope.

Under their feet was a teleportation array similar to the one they had entered before. Chen Yun calmed himself down slightly, slowly raised his eyes, and looked around.

Chen Yun stepped into a vast space. All he saw was white stone. Scattered among them were stone pits of varying sizes. The largest was over ten feet wide, while the smallest was only one foot.

He took a deep breath, feeling something was wrong.

Not only is there no grass growing in this world, there is no spiritual energy to be found either. The sky is gray and shrouds everything. It is clearly a hopeless situation. (End of this chapter)