The Sended's

Volume 3: Brightest Continent

They are not the smartest in Kelfia, but in their own human domain they are the brightest and best in science, the wisest they say

The use of magic by humans began from there, which is now spread to the four continents of the human region, they are the nations of inventors and scientists, but is it really so?

If true then wouldn't they be a heavy barrier for Ryuu, Kyouka, Maou, and Ruby kingdom?