The Portals of Summer - The Portals Series, #3

Davin Blackthorn, now called Marek, has gone from being the always-disappointing second son of General Kel Blackthorn to tyhe leader of the Sudo and Nortes Republics. Once a shy, willowy scholar, he has become, due to his manipulation of God's Power, a giant of a man, with incredible abilities and the capacity to rule the known world. But he faces a multitude of problems. Two of the countries in the plains refuse to acknowledge his leadership.
The Elitos, a northern faction of the mountain-dwelling Chanche nation, where Davin learned to subdue and control his abilities, have declared war on their southern brethren and refuse to ally with the rest of the nation to support Davin. Davin prepares armies to face those of the eastern plains nations, and their Elito allies in the mountains. Complicating the situation, the Elitos have also allied with an alien species who exist in another dimension, and who covet Davin's world for an expansion of their empire.
Can he defeat this massive alliance, forced to fight on multiple fronts? Or has he finally reached the limit of God's Power?