The Kingdom Qian harbored a secret realm known as Nandou Mountain, which opened once every twenty years. It was a place sealed by hundreds of powerful cultivators from the kingdom thousands of years ago, to ensure the continuity of the world of immortals in Qian.

Within it lay countless spiritual herbs, the most precious of which were the ones used for the Foundation Establishment Pill. However, these had been divided and guarded by the major immortal sects, with only a limited number of spots available.

Moreover, the secret realm imposed strict restrictions on cultivation levels, allowing only Qi cultivation phase cultivators to enter. The competition that occurred every twenty years was so fierce that only one in ten would survive.

Aside from the ten great immortal sects that had the means to cultivate the spiritual herbs for the Foundation Establishment Pill, the other sects did not, which was the fundamental difference between them. Natural Foundation Establishment was not only a waste of time but also prone to causing one to deviate from their path.