Council of the Sworn
The city of Erelhei-Cinlu dominates the vast cavern known as the Vault of the Drow. Though the Vault, aglow in a purple bio-luminescent haze, is six miles long and nearly as wide, the drow city is its crown. Erelhei-Cinlu is the most influential and cosmopolitan of all drow cities in the Underdark. Ruled by eight noble houses, each dominated by a high priestess, Erelhei-Cinlu crouches at the center of a web of alliances and rivalries, hidden plots, and ancient traditions that reach through an untold number of tunnels and caverns beneath the world, and on its surface.