This organization operates throughout Morrain and travels to kingdoms nearby. Its members (almost 100 strong) are all female (mostly human and half-elven), and typically are rangers, druids, or bards. The Sorority stealthily opposes evil organizations bent on destroying nature, as well as slavery in general. Their symbol is a pewter swan, but the organization rarely makes its presence known, even when defending the weak. The Sorority has many powerful allies (such as Lady Chauntessa) and fancies itself more of a spynet than a mercenary force.
UPDATE: You have become aware that Brianna ("Bree") the Bard at the Inn of the Slumbering Drake as well as her girlfriend Sapphira Silverhue are both members of this organization. This is how you learned it even exsisted.