Alien Battlefield

The Alien Battlefield had almost become a worthless ruin after the war with the Demon. Originally, the Alien Battlefield had been connected to the Three Upper Realms. But as time went on, the Three Upper Realms thought that the Alien Battlefield had become a burden, as well as a bomb that could explode at any time, so they shifted the responsibility for the Alien Battlefield to the Three Lower Realms. Once another war broke out on the Alien Battlefield, the Realms of the Nine Heavens, Milky, and True Force would all be attacked by demons.

Later discovered to have valuable strategic resources by the True Force Realm.