The vault of heaven.
Black and white qi surged, entwining as they slowly turned like millstones. At the highest point stood a boundless bronze wall. Specks of azure divine light condensed upon it and fell, becoming bird-and-insect seal script like stars in the heavens.
Xu Xuan looked inward at his Qi Sea, silently examining the Yuejue sword intent within the Cave-Transmuting Sword Casket. It took the form of inextricably entwined black and white qi, just like this realm, its aspects of life and death shifting with unfathomable subtlety.
Black and white qi rolled toward him like the tide. Azure radiance descended from the bronze wall high overhead, revealing a distant heavenly path. Before this vast momentum, Xu Xuan could only drift with the current, a lone skiff floating through the heart of heaven.
He looked at the bird-and-insect seal script flashing past beside the path. Most of it was incomplete, yielding no discernible meaning, but some characters gathered together into complete scriptures.
"[General Discourse on Greater Yin Form Refinement], [Southern Palace Purple Mansion Treatise], [Dragon-Fish River Chart], [Qian Metal Military Manual], [Sword Treatise on Life-and-Death Qi], [Sword Scripture of Cosmic Clarity and Time-Light], [Root of Heaven and Earth]."
The scriptures drifted up and down, emitting azure divine radiance. As Xu Xuan looked at them, he found most of their discussions abstruse and obscure. These were ancient treatises on the Dao, pointing straight to the Great Dao.
Xu Xuan swept his burning gaze over the scriptures. Altar Thunder sword intent arose of its own accord, lightning becoming strands of heavenly law. Dazzling silvery-white light enveloped his dharma body, while sword qi trembled like ripples and poured onto the ground.
He first looked at the [Root of Heaven and Earth]. Something stirred within him, and he sensed that this scripture expounded upon