Dragonforge

"War!" he said. "Plague! Famine! Death! These things you fear are the Four Horsemen of the Apocalypse. Kill me if you wish; you cannot halt their ride!"
Following the events of the novel Bitterwood, a new and untested dragon-king now rules the land. The firebrand prophet Ragnar has raised an army of men to overthrow the dragons, and their first target is the town of Dragon Forge, home to the foundries that supply weapons and armor for the king's soldiers. Against this backdrop of war, the legendary dragon-slayer Bant Bitterwood finds himself in an uneasy alliance with a sun-dragon named Hex as they race to halt the genocidal schemes of the most dangerous creature alive: Blasphet, the Murder God.