The bloodline of the Evil Clan could not cultivate, or at least could not learn the cultivation techniques of the Cultivation World.
Therefore, the villagers of Black Cloud Fort greatly envied cultivators.
So much so that when the Temple-Sealing Lord and his group of demon cultivators arrived at Black Cloud Fort, many villagers were willing to join and follow the demon cultivators, if only for the ethereal art of cultivation.
Grandma Valley was powerful with great divine power and held the secrets of the ancient Evil Clan's bloodline.
Yet she never shared these secrets with the villagers; she did not even have disciples or apprentices around her.
The entire Black Cloud Fort was made up of mortals, with only Grandma Valley as the powerful and extraordinary exception.