Piety and Poison
The Bloodreaver Clan is an alliance of goblinoid tribes who mostly hail from the north and west of the Nentir Vale.
Many of the constituent tribes are remnants of the Bloodspear Orcs, an overwhelmingly powerful horde which successfully raided the Vale some ninety years ago, defeating the armies of Fallcrest in the Battle of Gardbury. After the sacking of Fallcrest, some of the tribes annihilated each other through infighting while others marched beyond the Vale in search of new lands to conquer.
The resurgence of the orcs under the Bloodreaver banner is only known to a few residents of the Vale and they have not yet been properly appraised as a threat. The few orcs who have been captured have spoken of a warchief called Graka Bloodreaver and describe her as a scion of Gruumsh or even a demi-god.