Rise of the Twilight Empire
Lolth was once known as the Weaver, the goddess of Fate. She was the sister of Corellon and Sehanine, until she was touched by the Seed of Corruption. She became a demon, and was cast into the Abyss, where she makes her new home in the Demonweb Pits. She is the patron of the demon-blooded dark elves, whose strict hierarchical system exists as a parody of the strictures of fate.