Grestle and Porter
The two mercenaries known as Grestle and Porter were both former Pathfinder Society members. They were also lycanthropes— Porter, a werewolf; Grestle a were-rat. They were ejected from the Society because they often turned on their fellow Pathfinders, creating quite a few infected lycanthropes. Despite being kicked out, they continued to pose as Pathfinders, a fact which greatly bothered Reginar Lacklan.
When Quimbly Shortcloak inquired about joining the Pathfinder Society, Reginar suggested that if Quimbly could stop Grestle & Porter, sponsorship for the Society would be all but assured. Not long after, Quimbly and companions fought the two monstrous thugs and slew them.