Sole Cloud Flying Cave

Cui Heng was transmigrated to another world and the system told him that the new world he was in was a high-grade Xianxia world.
It was a world where Celestial Kings soared the sky and terrifying monsters ruled the lands. The strong would destroy a planet if their mood was bad and Cui Heng trembled in fear when he learned of how scary the new world was.
Thankfully, the system had granted him the protection that last for 300 years. As long as he remained in the safety zone, he would not receive any damage.
With his safety secured, he began his cultivation training for the next 300 years.
Throughout the years as he trained, some people entered his safety zone by mistake.
There was a peasant who was once a monk and a beggar. Despite that, he still had the dream of bringing peace to the land and saving the lives of millions.
There was a noble who was once called the once-in-a-million-year genius. Yet, luck wasn't at his side and his talent fell and was laughed at by others for years.
There was a princess whose only wish was to find her older brother. She could've become a celestial but decided to remain in the human realm to wait for her brother's return.
There was a weak lady who was plagued with illness from birth but had the goal of adventuring and helping the poor and weak.
...
Cui Heng befriended these people and even gave them a few pointers before they left.
300 years later, when the protection period had ended, he had finally mastered the Golden Core. Even then, he was still reluctant to go to the outside world.
But when he did, he realized that the world was merely a world of Wuxia.

Realizing This Is A Wuxia World After Cultivating For 300 Years

"The Plague Imperial Palace. This is a strange sect."

The Chongyang Star God thought for a moment and explained to Cui Heng, "The Plague Imperial Palace came here 120,000 years ago. The Star God at that time was not me. It was too long ago, and it's difficult for me to know. Exalted Immortal, please forgive me.

However, as time passed, I can understand some things about the past. It's said that before the Plague Imperial Palace came to Chongyang, it was the ruler of a large world with many Sages.

Later on, the great world they were in suffered a calamity and was forced to migrate to Chongyang Star. At that time, Chongyang Star only had one Sage and was unable to deal with the Plague Imperial Palace at all.

From 120,000 to 90,000 years ago, Chongyang Star was completely under the control of the Plague Imperial Palace. No faction could compare to them.

Exploring the Mystery of the Immortal Body