Rise of the Otherworld.

After bidding farewell to everyone in the sect, Lin Yu embarked on a journey to the mysterious ruins alone. Along the way, he slept in the open air and did not dare to slack off.

After several days of traveling, Lin Yu finally arrived at the location of the legendary mysterious ruins. In front of him was a barren valley, surrounded by towering mountains and shrouded in clouds and mist, giving people a mysterious and gloomy feeling.

Lin Yu took a deep breath and walked into the valley carefully. The valley was filled with an old smell, and the ground was covered with rocks and weeds. He observed his surroundings vigilantly, holding the sword tightly in his hand.

As he walked, Lin Yu suddenly felt a strong pressure coming, making it difficult for him to breathe. He frowned and used the spiritual energy in his body to resist the pressure.

"This relic is indeed not simple." Lin Yu thought to himself.

Continuing forward, Lin Yu came to an ancient stone gate. The stone gate was engraved with strange runes and patterns, emitting a mysterious light.

Lin Yu carefully observed these runes, trying to find a way to open the stone door. Just as he was thinking hard, the system's voice sounded: "Host, these runes seem to be related to an ancient formation. They need to be injected with specific spiritual energy to open them."

Lin Yu followed the system's instructions, adjusted the flow of spiritual energy in his body, and slowly injected it into the rune.

With a low roar, the stone door slowly opened, and a powerful airflow rushed out from it, almost knocking Lin Yu to the ground.

Lin Yu steadied himself and walked into the stone gate. Inside was a dark passage with a faint light flickering on the wall. He walked forward cautiously, and from time to time he heard strange sounds in his ears.

Suddenly, a huge monster jumped out from the darkness. The monster looked like a lion, but it had a pair of huge wings and blazing flames spewed out of its mouth.

Lin Yu quickly dodged sideways and swung his sword at the monster. The monster dodged flexibly and turned around to attack again.

Lin Yu engaged in a fierce battle with the monster. The monster's attack power was extremely strong, and Lin Yu was in danger several times, but with his tenacious will and superb martial arts, he gradually gained the upper hand.

After a hard fight, Lin Yu finally found the monster's weakness and stabbed it in the vitals with a sword, and the monster fell to the ground with a bang.

Lin Yu continued to move forward, and at the end of the passage, he found a secret room. Inside the secret room was an ancient treasure chest, emitting a mysterious light.

Lin Yu was excited and slowly approached the treasure chest. Just as he was about to open it, countless phantoms suddenly appeared around him and rushed towards him.

Lin Yu was startled and quickly waved his sword to resist. These phantoms were ethereal, but they were very powerful.

Lin Yu was caught in a bitter battle, his physical strength and spiritual energy were constantly depleted. But he did not give up, with only one belief in his heart, that he must get the treasure in the treasure chest.

At the critical moment, Lin Yu suddenly realized a new sword technique. He used this technique and instantly dispelled the phantom.

Lin Yu finally opened the treasure chest, which contained an ancient secret book and a mysterious magic weapon.

He picked up the secret book and magic weapon, his heart filled with joy. However, at this moment, there was a sudden violent tremor in the ruins, as if some danger was about to come.

Can Lin Yu leave the ruins safely? How will he use the newly acquired secret books and magic weapons to improve his strength?