The Bloodreavers are a tribe of hobgoblins that travel around the area where Melsper, the Free Vales and the Crandurian Republic come together. They also have many goblins who act as under-bosses and wolfrider scouts.
The Bloodreavers are infamous for their slave trade. They capture or buy humanoids for use as their own work force, and can act as suppliers for more unscrupulous individuals.
About nine months ago, a garrison of Bloodreavers traveled out of their normal stomping grounds, heading south into the Rhosarian Woods to the site of an ancient temple with a sizable contingent of slaves. They have been directing the slaves to dig out the top of the temple (which had accumulated a deep layer of sediment, essentially burying it), and then proceed through the inner levels, and finally to a series of catacombs below.