The strength of bloodlines was considered to be a mysterious power that humanity was still unable to explain via scientific methods. Ever since the beginning, such power did not belong to humanity. The dragon bloodline of the Seer Family and the werewolf bloodline of the Bella Dean Family were all achieved using 9th rank dimensional life forms as intermediaries as fusion sources. It was difficult for power not belonging to one's self to truly fuse with one's being. That's why various kinds of variations and mutations of power were ubiquitous for people who had inherited bloodlines. However, the most critical issue for bloodlines was how to allow such power to be inherited generation after generation.