If you just read S4, Iggwilv is simply some long-ago despot. But when you read WG6, she's now still living and a mastermind behind the theft of the Crook of Rao. I'd love to know if there's more to the storyline of Iggwilv and Iuz and what "happened" in Gary's campaign with them.
ken-do-nim on DF
Mayhem's spells: scroll with [bless, cure light wounds, cure light wounds, and detect magic], protection from evil