Of course, the Nine Heavens' Soil of Rest at that time, although strong, could not compare with the slice in Empress Nuwa's hands, which was about the level of high-grade Innate Spiritual Treasure.
Afterwards, that piece was collected by Tao's ancestor and used as material when constructing Zixiao Palace.
Theoretically, there should be no Nine Heavens' Soil of Rest left in this place. However, heaven never bars one's way, and all things have a glimmer of life, including the Nine Heavens' Soil of Rest.
It seemed that the Heavenly Dao couldn't bear to see the treasure of the Nine Heavens' Soil of Rest disappear, so, under the countless years of nurturing by the Five Elements' Original Source, the Nine Heavens' Soil of Rest in the place where Tao's ancestor found it didn't dissipate but gradually produced new Nine Heavens' Soil of Rest.
