The enhancement a God's Kingdom provides to a True God is beyond ordinary imagination. Standing in his own God's Kingdom, Harken had the confidence to face any True God, even if twenty incarnations of the Justice God attacked his Divine Realm simultaneously, he believed he could hold out for a while.
The God Country is constructed of Divine Power, and everything within it, including the Prayers and so on, can be transformed into Divine Power.
When necessary, one could obtain additional Divine Power by shrinking the God Country, transforming Prayers, and so on to hold out indefinitely.
This was the main reason why the God of Barbarism and Strength, Harken, could still maintain sufficient confidence when facing an onslaught of more than a dozen incarnations of gods from the Dark Divine Realm, as well as a vast army of Ground Dweller Angels — possessing his own God Country, he was confident he could outlast his adversaries until they gave up and retreated.