The Demon-God Emperor led three Demon Saints and three God Saints to the Machines' territory, leaving Lord Swelling Sky and one Demon Saint of equal power to guard the Godly and Demonic Realm respectively.
He deliberately hid himself away from the vicissitudes of fate, so that the True Lord of Morality and Nothingness would have a hard time determining where they were going. When he and the Three Realms finally find out, they would be able to reach the Machines already.
And when the Three Realms finally arrived, they won't be able to do a thing.
Either way, the Demon-God Emperor has decided that he would end Jiang He today—not even the True Lord of Morality and Nothingness would be able to save him then!
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