Queen of the Demonweb Pits
 At the conclusion 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 sinister plot described in the series involving hill giants, frost giants, fire giants, kuo-toa, drow, and other creatures. Her realm, the 66th layer of the Abyss, is referred to as the Demonweb Pits. The player characters are transported to another plane and cast into the labyrinth known as the Demonweb. In order to return home, the characters must find their way out of the web and then defeat the evil demigoddess Lolth in her lair. The Q1 module was the first to offer a glimpse into the Abyss itself, home to the D&D race of Demons. It features a map of the maze-like Demonweb Pits, a series of interweaving passageways constructed in a maelstrom of lost souls in the abyssal plane. Characters who venture off the path are most likely lost. Many spells work differently or not at all. In the maze, there are a number of portals to other worlds, some where Lolth is sending minions to try and invade, such as a winter world and a world of permanent night. This makes Queen of the Demonweb Pits an unusually open-ended adventure, as each "portal" could potentially lead to a massive area, from which the dungeon master could, if he or she chose, launch an entirely new campaign. As the adventure progresses, the player characters make their way through Lolth's webs, where they are confronted by her minions, slaves, guards, and captives. Here lies a gargantuan mechanical spider, which Lolth can manipulate. The dungeon also introduced Lolth's handmaidens, the demonic Yochlol.