Genshin Impact.

Lin Feng and others stood in front of the sarcophagus, which exuded an ancient and strange atmosphere. The old man looked solemn, staring at the sarcophagus, as if he wanted to see through the coffin lid to see the secret inside.

"Senior, this sarcophagus is so strange, do we really want to open it?" Amber asked with some concern.

The old man pondered for a moment and said slowly: "This sarcophagus hides a great secret, which may be the key to solving the mystery we are facing. But the danger is certainly great, everyone should be careful."

Lin Feng nodded, holding the sword tightly in his hand, his eyes revealing a firm determination. Li'er also stood aside, with her hands forming seals, ready to respond to any possible danger at any time.

The old man took a deep breath and pushed the coffin lid with both hands. With a dull friction sound, the coffin lid slowly moved, and a smell of decay came to their faces. Everyone couldn't help but cover their mouths and noses, and waited until the smell dissipated a little before looking into the coffin.

However, the scene inside the coffin surprised them. The inside of the sarcophagus was not filled with corpses or treasures as they imagined, but presented a strange space, as if it was an independent little world. The space was filled with a faint mist, making it difficult to see the scene in the distance.

"This...what's going on?" Amber said in surprise.

The old man frowned, thought for a moment and said, "It seems that this sarcophagus is a space magic weapon, and it is a world of its own. Let's go in carefully and check it out."

Lin Feng was the first to step into the space inside the sarcophagus, followed by the others. After entering the space, they found themselves in an ancient ruin. There were ruins all around, and dilapidated buildings were scattered in an orderly manner. In the distance, there was a tall tower with a faint light flickering on it.

"That tower may be the key. Let's go and take a look." Lin Feng said, pointing at the tower.

The crowd moved towards the tower cautiously. Along the way, they found that the ground was covered with strange runes, which flashed a faint light and seemed to contain some mysterious power.

When they arrived in front of the tower, they found the door closed. Lin Feng pushed it, but the door didn't budge. The old man walked up and carefully observed the runes on the door, then formed seals with his hands and muttered something. As the old man cast a spell, the runes on the door flashed with dazzling light, and the door slowly opened.

Inside the door was a spacious hall, with a huge statue in the center. The face of the statue was blurred, but its figure showed that it was a powerful being. At the feet of the statue, there was a circular stone platform with intricate patterns carved on it.

"This pattern seems to be a formation." Li'er said.

The old man nodded: "Yes, this is an ancient teleportation array, perhaps it can take us to the core area of ​​this space."

Everyone stepped onto the teleportation array, and the old man cast a spell again to activate the teleportation array. A flash of light passed by, and they were teleported to a mysterious valley. The valley was filled with a strong spiritual energy, and all kinds of exotic flowers and plants grew around. At the end of the valley, there was a palace.

The palace gate was open, and low roars could be heard from inside. Lin Feng and the others walked into the palace cautiously, and saw a huge monster inside. The monster was shaped like a cow, with two horns on its head, its body covered with hard scales, and its eyes flashing blood-red light.

"What kind of monster is this?" Amber exclaimed.

The old man looked solemn: "This should be the divine beast guarding this space. It seems that if we want to explore the secrets of this space, we must defeat it first."

Without saying anything, Lin Feng rushed towards the monster with his sword. The monster opened its bloody mouth and spurted out a stream of flames. Lin Feng dodged sideways and stabbed the monster's head with the sword in his hand. The monster swung its claws and collided with Lin Feng's sword, making a loud noise.

Li'er was not to be outdone. She formed seals with her hands and cast spells to attack the monster. Amber looked for the monster's weakness and waited for an opportunity to attack. The old man provided support and protection for them from behind.

With everyone's concerted efforts, the monster gradually lost the upper hand. Finally, Lin Feng stabbed the monster's vital point with a sword, and the monster fell to the ground and disappeared into a beam of light.

After defeating the monster, the group continued to go deeper into the palace. Deep in the palace, they found a huge stone box. The stone box was engraved with runes and exuded a mysterious atmosphere.

"This stone box may contain the answers we want." said the old man.

Lin Feng walked forward and gently opened the stone box. Inside the stone box was an ancient book. The words "Secret Book of Heaven and Earth" were engraved on the cover of the book.

The old man picked up the book and began to flip through it. As the pages turned, a look of surprise appeared on his face.

"It turns out that this space was created by an ancient great power. It contains unique methods of cultivation and treasures. However, in order to obtain these, one must pass a series of tests. The monster we just encountered is just one of the tests." said the old man.

When everyone heard this, they were both excited and worried. They were excited because if they could obtain these methods and treasures, their strength would be greatly improved; they were worried because they didn't know how difficult the next test would be.

"No matter what, we have come this far. There is no reason to retreat." Lin Feng said firmly.

Everyone nodded. They decided to continue exploring this space, meet the next test, and find more secrets and treasures...