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

At the same time, he comprehended his current state and made a judgment of his strength. The reason why the Immortal Ancestors and the Heaven Earth Saints were powerful was because they could rely on the remnants of the Three Supreme Gods' Dao Transformations to mobilize endless power.

Moreover, they could mobilize all the power on the Time Spectrum from the time of the Three Supreme Gods' Dao Transformations to the current time.

Cui Heng could only have an absolute advantage in the time periods that he occupied.

That was because he had only let his fake selves occupy all the universes in this time period. He had yet to reach this realm in the time period of the past.

However, this was only the current situation, and it did not mean that the Late-stage Return to Void Realm was only limited to this.

His breakthrough did not stop and continued.

Late-stage Return to Void Realm, Because It's Ancient, It's Powerful, Because It's Powerful, It's Ancient! (2)