From publisher blurb:
From the devotees of the Old Faith, who guard against despoilers and destroyers, to the zealous followers of the New God, who see evil and corruption wherever they look, religion comes in many forms. Called to Serve explores the priest path in depth, offering guidance for why one might follow this path and the role one might play serving the gods. As well, this supplement includes a slew of new expert paths so characters can go on serving their gods as they did from the beginning and unlock new talents to better advance the causes for which their gods fight. Whether you're playing a grim priest devoted to the Dark Gods or a pious warrior committed to the New God, this supplement offers a host of new options for fighting the Shadow of the Demon Lord!