Ancestral grounds are the core of every Sects and clan. The Azure Feather Ancient Kingdom has a history of tens of thousands of years. There are many figures, Who transcended beyond Nirvana Realm. They made their own clans and sects, Hoping their teachings and bloodline shall continue.
Once a cultivator reaches Origin Core Realm, They would able to understand the heavenly laws which grant them unimaginable powers. In that stage, They can pass down their ability and comprehension of heavenly laws through their bloodline.
A powerful bloodline means, The descendent's cultivation talent will soar. For example, if the progenitor comprehended the laws of Fire, Then the descendants will have a natural affinity towards the fire. Moreover, The descendent might even gain the Primordial Spirit of their ancestor.