The Fellowship of Friars is the smallest of the formal groups of the church. It consists of the loose support network for the missionaries, friars, and pilgrims that proselytize and grow the Church across and beyond Khorvaire.
The Fellowship of Friars is tasked with supporting small communities that do not yet have a dedicated minister, rallying support for the church's mission, and generally bringing the light of the flame into the dark.
Source: Politics of Thrane
In the argot of the Silver Flame, friars are priests who serve a missionary purpose. Rather than being assigned a specific region or community, friars travel from land to land, bringing the light of the Flame into dark places and converting all who seem receptive. A smaller proportion of the order’s members are pilgrims rather than friars. They are also wandering priests, but their duties are less well defined. They serve where they can, lead by example, con duct services and offer ser mons, and aid those who require assistance. Friars are also called “priests errant,” particularly among older Purified.
Friars and pilgrims take the light of the Flame into dark places. A friar goes through the same training as a minister, but instead of settling in a single community, he is charged with the task of missionary work. A friar travels across Khorvaire preaching the virtues of the Silver Flame and attempting to win converts to the church. Friars also serve as the eyes of the Church; a friar will search every new village for signs of possession, cult activity, or other foulness, and then he can report his findings back to the nearest Church official. The majority of friars are experts; a few remarkable individuals possess adept levels.
The role of the pilgrim is less strictly defined. A pilgrim wanders the world. She is not required to perform missionary work, but she is expected to lead by example wherever she goes, to oppose evil in all its forms. This is the lowest rank in the hierarchy of the church, but it still represents a commitment -- a vow to serve and protect. Pilgrims are not as well received as paladins, but the faithful will still support a passing pilgrim in exchange for a sermon or tales of her bold deeds. This is the most likely role for a PC cleric to fill: As a pilgrim, she is free to go on any adventure she sees fit.
Source: Dragonmark
The smallest group within the Church of the Silver Flame, the Fellowship of the Flame consists of a vast support network of priests that travel across the world, growing the Church and seeing to the needs of the faithful. The organisation is tasked with supporting small communities that don't yet have a minister, building support for the church's mission, and generally being the light in the darkness. The Fellowship of the Flame was formed by Turanank Noldrun, one of Tira Miron's adventuring companions.
Source: Sarhain's Guide to the Silver Flame