The Dreamworld Trilogy

Having just led the over-matched defenders of Hampstead to a victory against Lord Arrington's massive army of conquest, Garrette, Princess Lizette, and the leaders of the kingdom's defenses must now prepare to defeat Arrington in his home fortress and so end the existential threat to freedom on the Dreamworld. But Arrington holds Garrette's father, his former War Mage, as a hostage. And all the while, the gods wager on the outcome of the war and interfere to help ensure their favorites win.