The final divine light Shi Xuan's "Treasure Record of Crossing Calamities and Attaining the Dao" condensed was the Yin-Yang Mixed Cavern Divine Light. Unlike those of other lineages, however, this Yin-Yang Mixed Cavern Divine Light could only be fully cultivated after one had passed the lightning tribulation and achieved Primordial Spirit, becoming a Yang Spirit True Person.
Why was that? On the surface, the qi-refining section of the "Treasure Record of Crossing Calamities and Attaining the Dao" spoke of Clear Wind and thunder arts, but in truth, it expounded the Dao of yin-yang transformations. Whether wind or thunder, both were products of yin-yang transformations between Heaven and Earth. During the Qi Refining Stage, one experienced and cultivated the great Dao of yin-yang transformations through wind-element cultivation methods and the "Inner Scenery Five Thunder Method."
Thus, based on one's differing comprehension of the yin-yang transformations within wind and thunder at various stages of the Qi Refining Stage, as well as one's differing control over one's physical body, the true qi and dharma power condensed would differ as well. At the Qi Induction Stage, Shi Xuan would condense Samadhi Divine Wind True Qi. Once he reached the Spirit Soul Stage, his delicate control over spirit soul and flesh would become stronger, and his mastery of thunder arts deeper, allowing him to condense Divine Firmament Heavenly Thunder True Qi.
Of course, this did not mean Samadhi Divine Wind True Qi and Divine Firmament Heavenly Thunder True Qi would coexist within Shi Xuan's body. What had always existed within him were merely Yin-Yang Two Qi; Samadhi Divine Wind True Qi and Divine Firmament Heavenly Thunder True Qi were simply different combinations when used. Shi Xuan could switch freely between the two types of true qi at any time.
At the Golden Core Stage, he