By the time Chu Yuyan and Ye Feimu were in the midst of creating their Foundation Establishment stage medicinal pill, Meng Hao had already finished with the Spiritualization Pill, and had begun to work on the Nascent Soul medicinal pill.
Medicinal Pills for increasing the Cultivation Base during the Nascent Soul stage were made from rare medicinal plants not often seen in the world. There were not many such pills in the Southern Domain; for four or even five people from a single Sect to possess one would be considered beyond incredible.
These were not pills that could be mass produced; one batch might make three, or perhaps five. Therefore, they were quite prized. Such pills were not common even in the Violet Fate Sect.