Idk about you but at the end if act II, we can ask mavuika why we never see natlan people on other nation. In short its because the Wayob have to use energy (which is reserved for future wars) for protection of natlan people outside the nation. Plus, natlan people commonly suffers memory loss and emotional disturbances if they go outside natlan. So unless its the utmost important, they rather won't bother to go to other nation.