Wikipedia
In the fictional Forgotten Realms campaign setting of the Dungeons & Dragons fantasy role-playing game, the Moonstars are one of the most recent and most covert secret societies to appear in Faerûn in decades. Born in the tumult of a fall-out between several senior Harpers, the members of the Moonstars now operate independently of the former group, though they share many of the same goals. Led by the iconoclastic Chosen of Mystra, former Master Harper, ex-Lord of Waterdeep, and incredibly powerful and knowledgeable mage, Khelben "Blackstaff" Arunsun and his consort, the Mage Lady of Waterdeep, Laeral Silverhand, the Moonstars have spent the last few years establishing their own intelligence network, including agents, spies, informants, adventurers, and a system of portals to allow them fast access to any part of Faerûn.