According to the museum, after renewing Xiao Huo's blood and cleaning his bone marrow, yin yang cultivation would become possible where separation would occur. Top, to condense the unmanifested Dharma body; Middle, to condense Yin Yang Dharma body; Bottom, to condense ice and fire spirit body.
These three were choices of varying difficulties. Lin Jin had gone through them before and knew that condensing the unmanifested Dharma body was the best, but also the hardest. It was impossible to achieve so he simply gave up on that choice. As for the worst, he would never choose it if possible. Hence, only the middle selection was left available.
The Yin Yang Dharma body.
This was a mediocre path. As long as one's yin yang was regulated, condensing the Dharma body was possible. Despite calling it mediocre, this also depended on the era of the subject.
