Indeed, the Purple-Gold Blood Emperor's bloodline needs to be inherited.
Within the Bruch Family, there's a small vial of immensely powerful Purple Gold Origin Blood. This is the most precious treasure left behind by Cain Decula. As long as the successor consumes this vial of Purple Gold Origin Blood, they can inherit all the abilities of the Blood Emperor.
Of course, not every member of the Blood Clan can become a successor. This requires various factors including timing, opportunity, and suitability. For unsuitable members of the Blood Clan, touching the vial of Purple Gold Origin Blood will instantly cause a burning sensation on their body. Only the truly suitable person can smoothly drink the Origin Blood. Thus, for centuries, the Secret Party has yet to find a member of the Blood Clan capable of withstanding the power of the Purple Gold Origin Blood, and the Purple-Gold Blood Emperor has continued to lie dormant in history.
