The Right Hand Of God: Book Three, The Fire of Heaven Trilogy by Russell Kirkpatrick
The company has been scattered far and wide in its mission to prepare Faltha for war - now the armies of the Destroyer are near and invasion is imminent.
The small group now possesses the Jugom Ark, the flaming arrow of legend that, it is believed, will defeat their enemy. And when Leith returns to the city of Instruere carrying the Ark, thousands of people flock to him to fight for Faltha in the coming battle. But Leith is finding it difficult to accept people's faith in him, and his role as custodian of this sacred artefact. Until the events of 2,000 years ago finally play out in the present . . .
As the land darkens under the shadow of impending battle, the company must strive against treachery and self-doubt - for a great evil approaches.