aramis erak
Legend
I usually think of factions as being defined by the following:What is your advice for creating factions?
A common identity - what is it that unifies them?
A range within which they operate.
A set of 1-4 primary goals.
A list of key assets they can invoke against other factions.
If you know who they identify as, and their goals and assets, many times, one can readily see what their next move should be.
Knowing their leaders is nice, but not really essential at outset unless they're rulers of the civil government or of the church hierarchy (equivalent to hierarchical Christian churches' bishops, archbishops, metropolitan bishops). When they become relevant, they should have some goals of their own, say 1-3, which may or may not line up with the group... and whether or not they actually consider themselves within their faction, or consider the faction to be pawns.