Musen did not completely spread the Way of Celestial Immortality among the Human Tribe. Martial and celestial cultivators in Sacred Land of Spiritual Inheritence could freely come and comprehend these Enlightenment Tablets, but outside it, only basic transforming exercises were available. This was meant to leave humans a firm cultivation foundation.
Martial and celestial cultivators of the Human Tribe who were away could enter the Holy Land to cultivate after reaching the stage of Earth Changing (Primordial Unity Black Immortal). It did not matter whether they had gone through the selection process. This would allow the gathering of the elites of the tribe. This way, even if the Human Tribe suffered a misfortune, they could still conserve their force.