'The way of Xuantian Sword Intent, that's not necessarily the case. The nine-rank evaluation system is based on the orthodox cultivation techniques of Xuanmen, and it's most suited to the meridians and constitutions of the Central Plains people. So indeed, it's not quite suitable for foreign races to cultivate.
Similarly, people from the Central Plains are not necessarily able to learn how to use gu. After Chen Aisha cultivates to the Golden Core Stage, she can continue to cultivate other natal demonic gu, and her natal gu can also be cultivated into a human form.
Look at that little cauldron of hers, although it doesn't shine brightly, it bears great fortune. It is most likely a treasure passed down from ancient times. With the assistance of this magic weapon, cultivating her own family's techniques to the Nascent Soul Realm should pose no problem. Are you really not planning to take her as your disciple?'