Jovus Err has served as a chaplain for the 10th Host for millennia. He's somewhat dour and unimaginative, but there is no questioning his conviction or loyalty to whomever is apostle. It is perhaps these traits that have enabled him to survive for so long - he's never risen to become an Acolyte and has thus never been a threat to any apostle. His character traits (plus his undeniable flair for command and tactics) may also be the reason that of all of Obel Gar's chaplains, he alone remains in command of his company after Castor's reorganization.