Reaching the fifth level of the Body Refining Realm is enough to shock anyone.
Each level represents a watershed moment.
Reaching the fourth level of the Body Refining Realm at thirteen, unless one is extraordinarily talented, is already considered the limit. To cross this limit is as difficult as ascending to heaven. Even for the great tribes, it takes a massive amount of resources to push their geniuses to reach the fifth level of the Body Refining Realm.
Without sufficient resources, it is impossible for these geniuses to reach the fifth level of the Body Refining Realm.
Although Xu Hu has the cultivation level of the fifth level, in reality, he stayed in the Horse Thief Den and enjoyed abundant resources.
As for a middle-ranking tribe like the Yang family, it is difficult for them to push their young geniuses to reach the fifth level of the Body Refining Realm.
That's why the fourth-level cultivators in the Yang family are considered treasures.