Bregan D'aerthe is primarily a mercenary and mercantile band. Members, both individuals and the band as a whole, were available for hire to the highest bidder. Bregan D'aerthe was involved in most conflicts in Menzoberranzan in one way or another. The band expanded to trade surface goods from the surface to Menzoberranzan and the Underdark. For example, traded Netherese artifacts to Menzoberranzan via Luskan.
Bregan D'aerthe was also an information broker, willing to provide information for both sides of a conflict—for the right price. Its contacts reached even as far as the svirfneblin city of Blingdenstone.
Bregan D'aerthe had a reputation that normally allowed its agents to skip lines. Its members were given "credit" — often they didn't need to pay because of the threat of retaliation from Bregan D'aerthe.