Autobiography of Li Yunfei, a time traveler

After escaping from the cave that was about to collapse, everyone was gasping for breath, feeling lucky that they had escaped again.

"It was really dangerous this time." Someone said with lingering fear.

Li Yunfei looked around and said, "But we are not without gain. At least we found that this castle hides many unknown secrets."

Lin Ya nodded, "Yes, the sealed demon and the mysterious sarcophagus both indicate that many things have happened here."

After a short rest, everyone continued to explore the castle. They found some strange symbols and patterns in other parts of the castle, which seemed to be related to some ancient magic rituals.

“Could these symbols be the key to unlocking the secrets of the castle?” someone asked.

Li Yunfei pondered for a moment, "It's very likely, we have to study it carefully."

So they began to carefully record and analyze these symbols and patterns. After some effort, they found that these symbols seemed to point to a specific area of ​​the castle.

"Could that be the secret?" Lin Ya said excitedly.

Everyone walked towards that area with great expectation. When they arrived, they found a tightly closed door with various complicated runes engraved on it.

"It seems that this door is the key." Li Yunfei said.

They began to try various methods to open the door, but none of them succeeded. Just when everyone was feeling a little frustrated, Li Yunfei suddenly thought of something.

"Could it be related to the symbols we discovered before?" Li Yunfei said.

So, they touched and pressed the door in a certain order according to the symbols they had recorded before. When they completed the last action, the door made a dull sound and slowly opened.

Behind the door was a dark room filled with a mysterious atmosphere.

"Be careful." Li Yunfei reminded.

They walked into the room carefully and found that the walls were covered with ancient portraits. The characters in the portraits all had strange looks and expressions.

"What do these portraits mean?" someone asked in confusion.

Li Yunfei carefully observed these portraits, and suddenly his eyes stopped on one of them. The person in the portrait was holding a strange object in his hand, which looked like a key.

"Is this what we are looking for?" Li Yunfei's heart moved.

He approached the portrait and studied it carefully. As expected, he found a hidden compartment behind the portrait, in which was an ancient key.

"Found it!" Li Yunfei shouted excitedly.

Everyone gathered around and looked at the key.

"This key must be able to open something important." Lin Ya said.

Li Yunfei nodded, "Let's keep looking."

They continued to search for clues in the room with the key, and finally found a hidden mechanism in a corner. When they inserted the key into the mechanism, it made a clicking sound, and then a wall slowly rose up, revealing a passage leading to the underground.

"It seems that this is the final secret." Li Yunfei said.

They walked down the passage, which was filled with an old atmosphere. After walking for a while, they came to a huge basement. Various ancient instruments and items were placed in the basement, and in the center of the basement, there was a crystal ball emitting a strange light.

"What is that?" someone asked curiously.

Li Yunfei approached the crystal ball and felt a powerful energy fluctuation.

"This should be the core secret of the castle." Li Yunfei said.

They gathered around the crystal ball and began to study it. Through the crystal ball, they seemed to see some vague images, which seemed to tell the past of the castle and some unknown stories...