Most of the two heavens' grotto-heavens possessed a vast number of dao marks.
The main source of these dao marks were not tribulations but the contribution of generations of Gu Immortals.
For instance, Soul Pacifying grotto-heaven had over seven million soul path dao marks! With such an amount of soul path dao marks, the grotto-heaven contained a large number of super resource points.
At the start, Soul Pacifying grotto-heaven only had over one hundred thousand soul path dao marks. After it fused with a large nine heavens fragment, it was free from calamities and tribulations.
With the favor of heaven's will, Soul Pacifying grotto-heaven produced Gu Immortals generation after generations.
These Gu Immortals were humans, although they could casually choose their cultivation paths, most of them chose soul path.
