A grey werewolf is a predator that can appear as a humanoid or as a wolf.  Grey werewolves have a pack mentality.  To a grey werewolf, while transformed, the pack is what matters.  A grey werewolf prefers to eat venison than any other kind of meat.  Grey werewolves are similar to keystone species, and will decrease the deer populations in an area, or the population of deer-like monsters.  Grey werewolves are the sworn enemy of the Gnolls, and will do anything in their power to defend the woodlands from the excessive savagery thereof.  A noble being, their dietary needs force them to eat deer, which reigns in the destructive nature of the deer, as they destroy wooded areas.  Grey werewolves tend to be good, typically lawfully so.  Grey werewolves that embrace their bestial nature typically become pure, eating only when strictly neccesary.  They are great opponents of Graz'zt and Yeenoghu, and allies of the druids.  They are typically larger than normal wolves, and will do whatever is necesary.  While their means may be extreme, it gets the job done.