Suddenly, three strong auras exploded and Cairo saw a flash of yellow light coming in his direction. Cairo doesn't really have affinity for space magic and it causes him to put more effort to use them unlike Del
Thus, with this kind of speed, Cairo can't teleport away. No doubt that these three are the peak Great Mages of this border. There are only a hundreds to few thousand of them in the weaker Kingdom.
It was already not that bad to have three peak Great Mages in one city border. Even a weak Kingdom already has a large territory, they need to spread out their mages
Not to mention, not all borders are the same. Some contained more people and resources as they are one of the special frontlines that have a huge effect in the war
However, some are also not that important and they have weaker troops both in number and quantity