A disciple is divine spellcaster that channels the power of their deity in the service of that deity. Joining a cult when young to receive teaching and training, those lucky to be chosen to become disciples are charged to perform tasks that align with their chosen deities persona, many will form or join parties to undertake quests, some will join military forces to defend or attack in their deities name, others go it alone, using whatever means they can to achieve their mission.
Disciples can consecrate an area or call forth divine energy to smite their foes, summon divine shields to ward off physical blows and channel divine energy into their melee or ranged weapons or to heal the wounds of their allies. The longer a disciple follows their chosen deity and performs actions that follow their persona, the more powerful the priest will become.