Luochen took the book and read it carefully.

This book contains a lot of advanced knowledge about weapon refining, some of which even he, an experienced weapon refiner, has never seen before.

"This is really a priceless treasure." Luo Chen sighed, "With this knowledge, the magic weapons we refine will make a qualitative leap."

Qingshuang also showed an excited smile, she knew what this knowledge meant to them.

The two continued to sort out the items and put some precious instruments and materials into categories.

During the sorting process, Luochen discovered an ancient parchment with some complex patterns and symbols drawn on it.

"Qingshuang, come and take a look at this." Luo Chen handed the parchment to Qingshuang.

Qingshuang took the parchment and studied it carefully.

After a while, she raised her head, her eyes sparkling with excitement.

"Luochen, what is recorded here seems to be a long-lost formation. If it can be deployed, our defense capabilities will be greatly enhanced."

Luo Chen was also very surprised after hearing this.

He knew that if they could master this formation, their position in the world of immortality would be more stable.

"We have to find time to study this parchment carefully," Luo Chen said.

Qingshuang nodded, she knew it would take a lot of time, but in order to master this powerful formation, everything was worth it.

In the next few days, Luochen and Qingshuang began to study the contents on the parchment while resting.

They discovered that this formation was not only complex, but also required special materials to arrange.

"We need to collect these materials." Luochen said, pointing to a list of materials on the parchment.

Qingshuang looked at the list carefully and found that some of the materials were very rare and might take a long time to find.

"Let's start with materials that are easy to find." Qingshuang suggested.

Luochen agreed to Qingshuang's suggestion, and they began to ask around in the town, hoping to find the materials on the list.

After some hard work, they finally collected most of the materials.

However, one of the materials called "Tianxing Sand" has never been found.

"It seems we have to go to Tianxing Valley." Luo Chen said.

Tianxing Valley is a very remote place. It is said that a special kind of sand grows there, which is exactly the Tianxing sand they need.

"Tianxing Valley is very far from here, and the road is difficult and dangerous. We must be fully prepared." Qingshuang reminded.

Luochen nodded. He knew that this journey would not be easy, but they had no way out.

In order to be able to set up a powerful formation, they must go to Tianxing Valley.

After getting ready, Luochen and Qingshuang embarked on the journey to Tianxing Valley.

Along the way, they passed through dense forests and climbed over steep mountains.

Although the journey was difficult, the two supported each other and faced various challenges together.

Both Luo Chen and Qing Shuang understand that only by passing these tests can they become stronger.

"Luochen, have you ever thought about what if we can't find Tianxing Sand in Tianxing Valley?" Qingshuang asked during a break.

Luo Chen pondered for a while, and then replied: "If we really can't find it, then we have to find another way. The road to becoming an immortal is not easy, and every step is full of challenges, but as long as we don't give up, we will always succeed. There are solutions.”

Qingshuang nodded, she knew Luo Chen was right.

They moved on, filled with unwavering faith.

After several days of trekking, they finally arrived at the entrance of Tianxing Valley.

Tianxing Valley is located on a desolate plateau, surrounded by endless mountains.

The valley is shrouded in clouds and mist, making it appear mysterious and unpredictable.

"This is Tianxing Valley." Luo Chen looked at the scene in front of him and whispered.

Qingshuang also felt excited. She knew that what they were about to face would be a major test in their immortal cultivation career.

The two entered Tianxing Valley cautiously.

The scenery in the valley is strange, full of strange-shaped rocks and shimmering sand.

Following the description on the parchment, they began to look for traces of the Sky Star Sand.

"Luochen, look over there!" Qingshuang said, pointing to a piece of sand that shone with silver light.

Luo Chen looked in the direction pointed by Qingshuang and saw that the sand and gravel were shining dazzlingly under the sunlight.

He was overjoyed, knowing that this was exactly the Tianxing Sand they were looking for.

"We found it!" Luo Chen said excitedly.

The two quickly collected some Sky Star Sand and began to look for a way back.

However, just as they were about to leave, a strong vibration suddenly came from the bottom of the valley.

"What happened?" Qingshuang asked nervously.

Luo Chen shook his head, he didn't know what happened.

The two of them walked cautiously towards the source of the vibration, wanting to find out what was going on.

They came to the bottom of the valley and found a huge stone door covered with ancient runes.

The stone door was slightly open, as if something was trying to come out.

"Be careful, Qingshuang." Luo Chen reminded.

Qingshuang nodded, knowing that there was an unknown danger hidden here.

The two held their breath and slowly approached the stone door.

Suddenly, the stone door opened completely, and a powerful force burst out from it, knocking Luo Chen and Qingshuang flying out.

The two fell heavily to the ground, feeling dizzy.

"Luochen, are you okay?" Qingshuang struggled to get up and asked with concern.

Luo Chen shook his head. Although there was some pain, it was nothing serious.

"I'm fine, Qingshuang." Luo Chen replied, and at the same time he stood up and patted the dust on his body.

He looked firmly at the stone door, full of curiosity and vigilance.

Qing Shuang also stood up, she held Luo Chen's hand tightly, and the two of them walked towards the stone gate together.

As they approached, the runes on the stone door seemed to respond to their arrival, glowing more dazzlingly.

"There must be some secret hidden behind this stone door." Qingshuang whispered.

Luo Chen nodded. He carefully observed the runes on the stone door and tried to decipher its meaning.

After a while, he slowly spoke: "These runes seem to be used to seal some kind of power. It seems that we have to be careful."

They carefully walked through the stone door and found a huge cave inside.

In the center of the cave, there is a huge circular stone platform with an ancient stone box placed on the stone platform.

The stone box is also engraved with runes, echoing the runes on the stone door.

"Could this stone box be the source of Tianxing Sand?" Qingshuang guessed.

Luochen didn't answer. He stepped forward and looked at the stone box carefully.

He found that the lid of the stone box was not completely closed and seemed to be openable.

He took a deep breath and then slowly pushed open the lid of the stone box.

As the lid opened, a soft light emitted from the stone box, illuminating the entire cave.

In the light, tiny sandstones slowly rose up and rotated around the stone box, as if they were alive.

"This...this is the essence of Tianxing Sand!" Qingshuang exclaimed.

Luochen nodded. He took out a special container from his arms and carefully collected the sand and gravel.

These sands are purer than the Star Sand they found before and contain powerful energy.

"With these, our formation layout will be more perfect." Luo Chen said.

Qingshuang was also very excited. She knew what the essence of Tianxingsha meant to them these days.

They put the container away and prepared to leave the cave.

However, just as they turned around, the floor of the cave suddenly began to shake, and the stone box on the stone platform also trembled.

Luo Chen and Qing Shuang quickly retreated and looked around warily.

"Be careful, Qingshuang." Luo Chen reminded again.

Suddenly, a dazzling light burst out from the stone box, illuminating the entire cave like daylight.

In the light, a vague figure gradually appeared.

"This is..." Qingshuang said in surprise.

The figure gradually became clearer, and it turned out to be an old man. He was wearing a simple robe and had a kind face.

The old man slowly opened his eyes, his gaze like a torch, sweeping over Luo Chen and Qing Shuang.

"Young people, why did you break into this place?" The old man's voice was low and powerful.

Luo Chen and Qing Shuang looked at each other, and then Luo Chen took a step forward and replied respectfully: "We are here to find Tianxing Sand, no offense intended."

The old man nodded and his eyes softened: "Tianxingsha is a treasure between heaven and earth. It must be found by those who are destined to get it. The fact that you can find it here means that you are destined to it."

After Qingshuang heard this, she felt happy. She knew this meant that they could take away the essence of these Tianxing Sands.

The old man continued: "But you have also seen that Tianxingsha is not an ownerless thing. I am the guardian of this place and am responsible for guarding these treasures. If you want to take them away, you must pass my test."

Luo Chen and Qing Shuang looked at each other and smiled. They knew that this was a rare opportunity and a test of their strength.

"Please enlighten me from the guardian." Luo Chen said firmly.

The old man smiled slightly. He took out two items from his sleeves and handed them to Luo Chen and Qing Shuang respectively.

They were a pair of jade pendants with complex runes engraved on them.

"These are two jade pendants, each containing different powers. You need to cooperate to unlock the runes on the jade pendants in order to pass the test." The old man explained.

Luo Chen and Qing Shuang took the jade pendant and began to study it carefully.

They discovered that the runes on the jade pendant seemed to require the cooperation of two people to unlock them.

"Let's get started." Qingshuang said.

Luo Chen nodded, and they began to try to match the runes on the jade pendant one by one.

After some hard work, they finally found the right combination.

As the last rune was put together, the jade pendant emitted a soft light, surrounding Luo Chen and Qing Shuang.

After the light dissipated, they found that they had returned to the entrance of Tianxing Valley.

"Congratulations, you passed the test." The old man's voice sounded in their ears.

Luo Chen and Qing Shuang turned around and found that the old man had disappeared, leaving only the pair of jade pendants lying quietly in their hands.

"We succeeded!" Qingshuang said excitedly.

Luochen smiled and nodded, knowing that this experience meant a lot to them.

Not only did they get the essence of Tianxing Sand, they also passed the guardian's test and gained valuable experience.

"Let's go back, Qingshuang." Luo Chen said.

Qingshuang nodded, and the two of them took the essence of Tianxing Sand and the jade pendant and walked towards the previous valley.

This time, they had a great harvest.

Not only did they harvest a large amount of weapon refining materials, but they even harvested a lot of the essence of the Star Sand from this formation.

These things will be enough for them to use for a while.

Luo Chen and Qing Shuang returned along the way they came, feeling full of a sense of accomplishment.

They knew that this adventure not only allowed them to obtain precious materials, but also allowed them to take a step further on the road of cultivating immortals.

"Luo Chen, how do you think we should use the essence of these Tianxing Sands?" Qing Shuang asked curiously.

Luo Chen pondered for a moment, then replied: "These essences contain powerful energy. We can use them to improve the quality of magic tools or to arrange more advanced formations, but we need to study how to use them most effectively first."

Qing Shuang nodded. She knew that Luo Chen had profound attainments in this area and believed that he could make the best decision.

After returning to the town, they did not rush to leave, but decided to stay in the inn for a few more days to better study these newly acquired materials and knowledge.

In the room of the inn, Luo Chen and Qing Shuang began to carefully study the pair of jade pendants.

The runes on the jade pendants were complex and mysterious, and seemed to contain some powerful power.

"Luo Chen, look at this rune. It seems to be related to the formation we saw on the parchment before." Qingshuang pointed to a rune on the jade pendant and said.

Luo Chen took a closer look and found that the rune on the jade pendant was surprisingly similar to the formation on the parchment.

"This may mean that the rune on the jade pendant has some connection with the lost formation." Luo Chen said thoughtfully.

Qingshuang's eyes flashed with excitement: "So, can we improve the formation by studying these runes?"

Luo Chen nodded: "This is a good idea. We can try to understand the runes on the jade pendant first, and then combine them with the formation on the parchment."

In the next few days, Luo Chen and Qingshuang hardly left the house. They devoted themselves to the study of the jade pendant and parchment.

They kept trying and failing, but every failure made them understand these mysterious runes more deeply.

Finally, late one night, Luo Chen and Qingshuang exclaimed at the same time.

"Qingshuang, I understand!" Luo Chen said excitedly.

Qingshuang also nodded excitedly: "I also found the key!"

They found that the runes on the jade pendant were actually part of the formation on the parchment, and it was a key link.

By combining the runes on the jade pendant with the formation on the parchment, they could arrange an unprecedentedly powerful formation.

"Once this formation is successfully arranged, our defense capabilities will be raised to a new level." Luo Chen said excitedly.

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