Kingly aura referred to a special aura possessed by kings. Here, "king" did not necessarily mean someone who had obtained the King profession; any creature associated with kings could be included.
For example, the Gray Wolf King, Black Forest Horse King, Wild Dog King, Boar King, Water Buffalo King...
As long as a creature's name ended with "King," it possessed kingly aura. The stronger it was, the more kingly aura it possessed; conversely, the weaker it was, the less it possessed.
Basic creatures such as the Wild Dog King and Wild Chicken King possessed very little kingly aura, but at least they had some, and it could serve a small purpose.
These creatures were not the only ones who counted. Some people did as well. They did not necessarily need to have obtained the King profession—so long as they possessed a kingly bloodline or were heirs to a king's legacy, they could be included.
In other words, descendants with kingly bloodlines, as well as heirs to the legacies of various nations, would all possess kingly aura.
There were two ways to obtain kingly aura: killing the target or subduing them. Both could yield kingly aura, but it showed that killing these people would grant more of it.
Zhao Fu felt that kingly aura was somewhat like fate. It was the purest sliver of fortune within those people or creatures—the fortune that might allow them to become kings. What the Crown of Kings needed for restoration was precisely this kind of fortune.
Killing them meant ending their lives and erasing everything they possessed. The fortune they carried would then vanish completely, which was why killing them yielded more kingly aura.
In the future, he could kill all sorts of creatures whose names ended in "King." The heirs of nations and the