The ancient battlefield is the gateway through which the Nefarious Demon Region invades the Mortal Realm.
They didn't go through the Endless Sea Region; the Immortal Realm Channel has always been connected to the Middle Latitude, and under the Immortal Emperor's leadership, they arrived on the ancient battlefield.
The Immortal Emperor looked grimly at the desolation around him—broken swords and shattered remains littered everywhere, half-buried upright in the dirt, with blades protruding above the surface.
No words were needed; the Immortal Emperor and the Immortal Realm's army bowed automatically toward these remains.
To them, the Mortal Realm is also a savior.
If the Mortal Realm hadn't fought to the death, if they hadn't burned themselves out in sacrifice, the next target would most likely have been the Immortal Realm.
