So the Secretary chick is either one of the demonlords who fucks up the world or one of the gods that allowing such a fucked up world.
If a demonlord really is making it so a city thrives, a population expand, makes me think this world works like Rance's. The lesser the global population gets a certain weapon becomes stronger, and when there's only one entity left, the weapon unlocks an ability to be able to kill gods.