One had to know that the immortal realm had an immortal-grade spiritual item ranked above mortal-nine—the essence of divine treasures!
Any essence of divine treasures could allow extremely talented immortal cultivators to cultivate to rank 8 in the Immortal Ascension stage without any difficulties. After fusing it with their cultivation path, they could directly become immortal!
As for encountering bottlenecks?
In front of the essence of divine treasures, there was no such thing as a bottleneck!
If it weren't for the rule that indirectly limited the number of True Immortals, True Immortals who weren't from the immortal race would probably never appear!
Depriving the heavenly luck, refining cultivation slaves, and other methods were enough to see some hidden problems.