at the end of "vault of the drow", the characters find an astral gate leading to the abyssal realm of lolth, demon queen of spiders, goddess of the drow elves and architect of the plot involving hill giants, frost giants, fire giants, kuo-toa and drow. her realm, the 66th layer of the abyss, is known as the demonweb pits. the player characters are transported to another plane and cast into a labyrinth, known as the demonweb. to return home, they must find a way out of the web and defeat lolth in her lair.