Palace Library

Cain really had to count his luck that he has Holy Land knowledge resources so readily available to him. 

Relying on lucky chances and powerful martial resources would only get him and Amber so far. At some point, they would need to refine their knowledge to prove upon their fundamentals.

Not just the duo, but many other talented cultivators, even Holy King masters and Primal Sovereign grandmasters, needed to go through with this process. 

Compared to legends of geniuses with extremely high combat prowess, there are not so many who have extremely quick cultivation speed. 

Even if one wanted to use external resources to artificially boost their cultivation, it could only go so far. Many cultivators stay stuck in the Great Divine Sea realm because of this case. Only select few, if they're extremely lucky, can reach the Divine Star realm. Although, that cultivator would never be able to advance in his life again.