According to the Book:
The Marguul tribes of southern Darguun are dominated by bugbears. The Marguul keep members of other races (including goblins and hobgoblins) as slaves, and only bugbears can be full members of a Marguul tribe.
Despite their xenophobia, most of the Marguul tribes pay homage to the Lhesh Haruuc and the Ghaal’dar. However, the few exceptions can prove dangerous to travelers. The Kalkor are a Marguul tribe whose members worship the Mockery, and who delight in flaying their enemies alive. A veteran warrior named Morgaath rules the Kalkor, frequently leading hunting expeditions against outsiders who dare to venture into the Seawall Mountains.
