Nice example of a worldspanning order and their role. Would have liked to know more about the structure of the organisation. Is there a central headquarter or is it more of a network of equal regional bases? How are decisions made? Is there a grand master or a council?
A few details on things like the binding vows (which suggests they have a restraining role on wizardry) and perhaps also different factions with the guild would be nice extra touches. Go to Comment