From a younger stage of her life, Stella Rivian has always seen herself as a superior human, because of her rare magic affinity for the light mana attribute and the fact that she had a direct connection to the first Dark Knight to exist. This connection meant more than just sharing blood with the saviors of humanity but was similar to how the queen of Asterisk Kingdom had inherited the knowledge of her predecessors. In the Rivian bloodline, they passed on combat abilities from generation to generation to ensure that the world would never have to face what happened five hundred years ago.
Yes, Rivians had ruled for this long because of their superiority over most humans. They were so strong that they were acknowledged as the strongest humans by the Dragon kings themselves.
