A Cast of Stones — Patrick W. Carr

In the backwater village of Callowford, Errol Stone's search for a drink is interrupted by a church messenger who arrives with urgent missives for the hermit priest in the hills. Desperate for coin, Errol volunteers to deliver them but soon finds himself hunted by deadly assassins. Forced to flee with the priest and a small band of travelers, Errol soon learns he's joined a quest that could change the fate of his kingdom.

Protected for millennia by the heirs of the first king, the kingdom's dynasty is near an end and a new king must be selected. As tension and danger mount, Errol must leave behind his drunkenness and grief, learn to fight, and come to know his God in order to survive a journey to discover his destiny.