700 The Genius Winter Demon!

In a war, the most important aspects for both sides were the control over air and the efficacy of resurrection.

That was especially so when the war took place in such a remote area far from the city. Controlling the air space was equivalent to controlling the pace of the battle. It meant that they could sacrifice the least in exchange for the most of the enemy's life. On the other hand, the number of Radiant Priests represented one's supportive capacity. More Radiant Priests implied that a Party could absorb more casualties, thus putting them in a more favorable position.

In the battle between the Fallen Angels and Ten Great Leagues, all individuals involved were air combatants.