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 Immortal Dawn Sword Art was a sword art that Cui Heng had taught Jiang Qiqi.

At that time, Cui Heng was only at the Foundation Establishment realm. His initial Immortal Dawn Sword Art could only be cultivated to the Early-stage Foundation Establishment realm.

Now, Daozhou Star's Immortal Dawn Sect and Zheng Nanxun, who was beside him, cultivated the Immortal Dawn Sword Art that he had modified. Their realms had expanded a lot.

Now that he had sensed the sword intent that had clearly been sublimated from the Immortal Dawn Sword Art in the Heaven Realm, there was only one possibility—

This must be a sword mark left behind by Jiang Qiqi.

She had also optimized the Immortal Dawn Sword Art and deduced this sword art to a level that was slightly weaker than the Ninth Realm of the Immortal World.

Priest Linshan said that the beast skin was left with the sword mark of a Heavenly God.

Aftershock of Sword Light, Scarlet Calamity