In this world, existed many many different kinds of beings. There were those who were born into being the royal kinds, there were those who were born into the holy kinds and had the power to move mountains and lift the sea. There were even the celestial kinds, who were known to be one in a million.
To sum it up, all of the different kinds were very powerful.
This "powerful" is used to describe the talent the kinds were born with physically and spiritually. At the moment of birth, all the different foreign kinds are stronger compared to humankind. This meant all the foreign kinds had more potential than the humankind and could easily peer down onto the humankind.
Therefore, every time the foreign kinds are mentioned, the humankinds would subconsciously have a change of expression and wouldn't dare to act reckless. On the other side of the coin, the foreign kinds never found the humans to be a threat and always thought that they can easily kill the humans whenever they want to.