Bregan D'aerthe is a mercenary company founded and led by Jarlaxle Baenre. It has many members throughout the Underdark and on the surface. The vast majority of its members are drow men.
Under the command of Jarlaxle, around 60 members of Bregan D'aerthe traveled to Waterdeep, disguised as human crewmembers of the Sea Maiden's Faire. They helped Jarlaxle attempt to steal half a million gold pieces and the Dragon Staff from the Vault of Dragons, but were thwarted by Team TRASH (pandas). Many of them were arrested, including three lieutenants: Fel'rekt Lafeen, Soluun Xibrindas, and Krebbyg Masq'il'yr. Jarlaxle's youngest sister, Sinuit Baenre, ransomed some of the arrested drow.