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

In the past spacetime, Emperor Wu, who had just taken out the jade slip, suddenly froze. He could only sense pure pitch-black light and nothing else.

The Yin Yang Seal intertwined with Yin and Yang and life and death. Under the illumination of the pitch-black light on the Yin side, everything had to walk towards the final destruction. It could be said to be an extremely powerful offensive spell.

Especially after Cui Heng broke through to the Return to Void Realm and felt the scouring of time and saw the rise and fall of the Sea of Bitterness, his understanding of this kind of destruction became even deeper.

This also caused the power of the Yin Yang Seal to increase.

Under the illumination of this dark light, even Immortal Emperors who had already stepped into the Grand Completion stage of the Heavenless Realm would fall into a state of destruction on the spot. They would be completely killed in an instant.

A Gift Left Behind by the Supreme God of Man