The Dragonward - The Godsfall Trilogy, #1

Three years after the War of the Lotus, alliances have already begun to unravel. As Rowen Locke struggles to maintain peace, troubling news reaches him from every corner. Persecution of the Shel'ai has reignited in the south, spurred on by a fanatical priest. To the north, the Isle Knights are withering under the leadership of mad Crovis Ammerhel. Old friends fight each other when not drowning their sorrows in taverns.
A new threat emerges from across the sea, dispatched by the same exiled Dragonkin who have been plotting their revenge for centuries. Rowen and his companions soon realize that the target is the Dragonward itself: their one and only defense against an evil so vast even Knightswrath could not vanquish it.