Dong Lei was someone who had obtained an SSS talent. There were no requirements for him to snatch the skill.
He just needed to use his moves and skills. There was no need for bloodline or fertility.
Actually, the Yan family knew about this situation.
Therefore, even if the younger generation learned it, they rarely used the Blood Awakening.
On the one hand, the consumption of blood essence affected their strength.
On the other hand, the more they used the Blood Awakening, the more it would affect their descendants.
Many members of the Yan family learned this after giving birth to almost all their children.
Yan Zhouzi was widely liked by the Great Ancestor of the Yan Family, Yan Tiling.
Therefore, the Great Ancestor of the Yan Family, Yan Tiling, let Yan Zhouzi learn this ultimate skill in advance.