Heterodox cultivators find it hard to achieve the Great Saint realm; essentially, it is a matter of harvesting or not harvesting.
Once one cultivates heterodox classics, they establish a connection with great evil demons or even supreme beings in the unseen.
After reaching a certain level of cultivation, the senses deepen, making one prone to being harvested and encountering calamity.
However, Xuanmen Orthodox cultivators, who worship two Dao Ancestors, can easily pass through as long as Time's Ouroboros and the Door Master have no such intention.
Of course, even if there are no barriers, achieving the Great Saint realm is extremely difficult; Dao transformation is a threshold that no one can escape.
Compared to Daoist Great Saints, heterodox Great Saints must suppress Dao transformation, ascend to the utmost, and sever the black hand, increasing the difficulty significantly, hence their rarity.
