Why does the foreign side want to take over that world?

At this point in the story I am plagued with the question of shi haos world is so desolate why does the foreign invader even want to invade, it's empty wasteland for miles and miles, the resources are non existent and horrible quality, even the heavenly dao is incomplete, there is literally nothing there worth fighting for so why does the other side insist on attacking them? Nothing they take out will be worth the cost of attacking 
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