Besides a Celestial and Earthly Treasure for each of its two array cores, the Yin Yang Body Refining Array also required nine hundred ninety-nine Yin-attribute Spiritual Objects and nine hundred ninety-nine Yang-attribute Spiritual Objects.
The Yin-attribute Spiritual Objects were a type of "water milk" aged for over ten years, provided by Gu Heng Taoist. Sanhe Temple happened to have a natural grotto where this "water milk" was most abundant. The Yang-attribute Spiritual Objects were Flame Soil, a kind of Spiritual Soil from near a volcano that had been nourished by fire-attribute Spiritual Qi for over a century.
Before these objects could be placed, Array Runes had to be inscribed on the floor, ceiling, and walls. Only Wang Ping could perform this step. The material used for the runes was common cinnabar, which maximized the transmission of Spiritual Qi and was also resistant to corrosion.
