Rise of the Otherworld.

After Lin Yu settled down in the Zhenwang Sect, he continued to pass on his knowledge to the younger disciples. His teaching method was profound and simple, which benefited the disciples a lot.

However, the peaceful days did not last long. One day, Lin Yu received a mysterious letter with no signature but only a strange symbol.

Lin Yu opened the letter, which contained a map and a letter. The letter read, "Lin Yu, I know you are a brave man. I have an important mission for you. This map marks a mysterious place where a huge secret is hidden. I hope you can go there and uncover this secret."

Lin Yu frowned slightly, his heart full of doubts. Who is this mysterious person? Why did he give him this letter? What secrets are hidden in this mysterious place?

Lin Yu decided to go to this mysterious place to uncover the secret. He bid farewell to the people of the Zhenwang Sect and embarked on a new journey.

Following the instructions on the map, Lin Yu came to a remote valley. The valley was filled with a mysterious atmosphere that made people feel chilling.

Lin Yu walked into the valley cautiously, looking for clues everywhere. Suddenly, he found a huge stone door. The stone door was engraved with strange symbols, exuding an ancient atmosphere.

Lin Yu tried to push the stone door open, but it didn't move at all. He carefully observed the symbols on the stone door, trying to find a way to open it.

After some effort, Lin Yu finally found the mechanism on the stone door. He followed the instructions of the mechanism and successfully opened the stone door.

Behind the stone gate was a long passage, and at the end of the passage was a huge hall. In the hall stood a huge treasure chest inlaid with various precious gems.

Lin Yu opened the treasure chest and found an ancient book inside. The book recorded a powerful technique that could greatly improve a person's strength.

Lin Yu was ecstatic, knowing that he had found a priceless treasure. He put the book in his arms and prepared to leave the hall.

However, just as he turned around, a figure suddenly appeared in front of him. This figure was shrouded in a black robe, and his face could not be seen clearly.

"Who are you?" Lin Yu asked warily.

"You don't need to know who I am," the black-robed man said coldly, "You only need to know that you took something you shouldn't have taken."

Lin Yu's heart sank, he knew he was in trouble. He held the book tightly in his hand, ready to meet the attack of the man in black robe.

The black-robed man suddenly attacked, and a powerful energy wave hit Lin Yu. Lin Yu used his own skills and started a fierce battle with the black-robed man.

The black-robed man was very powerful, and Lin Yu was gradually at a disadvantage. However, he did not retreat and still resisted stubbornly.

Just when Lin Yu was about to collapse, a ray of light suddenly fell from the sky and enveloped the man in black robes. The man in black robes screamed and disappeared without a trace.

Lin Yu breathed a sigh of relief. He looked up and saw an old man standing in front of him. The old man was dressed in white, with a kind face and a powerful aura.

"Young man, you are quite good." The old man said with a smile, "You have passed my test."

"Test?" Lin Yu asked doubtfully.

"Yes, all of this is a test set by me," the old man said. "I am a reclusive master who has been searching for a suitable successor. I discovered your potential, so I set this test."

Lin Yu suddenly realized that all this was arranged by the old man. He said gratefully: "Thank you for your appreciation, senior."

"You're welcome," the old man said. "From today on, you are my successor. This technique is the fruit of my life's work. I hope you can practice it well and carry it forward."

Lin Yu took the technique, his heart filled with gratitude. He knew that he had obtained a once-in-a-lifetime opportunity.

"Senior, I will definitely not let you down." Lin Yu said.

The old man nodded with satisfaction, then disappeared without a trace.

Lin Yu took the technique and left the hall. He knew that his fate had changed from then on.