of the Dragonlance setting. Some theories say that these rare Drow may have accidentally been sent there during a plane shifting spell or related magic, a misfire as like as not that is corrected before the respective timelines are tampered with too drastically. In Greyhawk In the world of Greyhawk, the drow were driven underground by their surface-dwelling relatives because of ideological differences. There they eventually adapted to their surroundings, especially by attracting the attention of the goddess Lolth, "Queen of Spiders". The center of drow civilization is the subterranean city Erelhei-Cinlu, and its surrounding Vault, commonly called the Vault of the Drow. Drow rank structure was based much more on personal experience level and proven personal abilities rather than on gender. Males were just as likely to have positions of authority over both males and females, and the tradition of matriarchy, where the highest-ranking member was always a female, was not a special directive of the Demon Queen Lolth. The vast majority of Drow Elves both male and female in the original campaign setting of Greyhawk have no authority or ranking at all and live an idle and degenerate life in the great city of the Drow. Known drow of Greyhawk include Clannair Blackshadow, Derken Gale, Jawal Severnain, and Landis Bree of Greyhawk City; Eclavdra of House Eilserv; and Edralve of the Slave Lords. In the drow city Erelhei-Cinlu, player characters may freely enter the city and spend time there, unless they attempt to organize any escaped slave groups for open warfare against the drow; the threat of a slave uprising will bring the chaotic drow into full cooperation. Some drow worship a nameless Elder Elemental God (said to have ties to Tharizdun) instead of Lolth. The module Vault of the Drow showcases that the House of Eilservs, led by Eclavdra in Erelhei-Cinlu, turned from worship of Lolth to the Elder Elemental God when the city's other noble houses allied against them after proclaiming that their mistress should be the Queen of All Drow. Eilservs attempted to establish a power base through a puppet kingdom in the surface world dedicated to the worship of their new deity, so that their demands of supreme power in the Vault can no longer be denied, but this scheme was ruined. In other campaign settings In the Mystara / "Known World" setting, shadow elves are a race of subterranean elves who have been