Langdarma got a writeup in the 3rd Dragon Magazine Annual. It's an earthly paradise protected by a Movanic Deva known as 'The Sannyasi'. It's kind of a divine protectorate. A power called Abhirati created the place but left to travel the planes, leaving behind a portion of her power to be...
Realmspace says the The Dock is the greatest and also strangest Spelljamming trade port in all of Toril. It has 300 dry docks; magical tethers and a huge Arcane bazaar.
However, the place is run by a bunch of guys who are described like the G-Man from the Half-Life games, who tax the bejeezus...
These lands are indeed from the game Blood & Magic. However, that game was adopted in canon and is now the most detailed source of lore on this region. There was a page-long writeup in the Grand History of the Realms as well. The area also appears in the Double Diamond Saga, which has since been...