Iggwilv is characterized as a selfish, evil-aligned magic user with much power and a penchant for sexual manipulation. She is the creator of the Demonomicons. For a period of time, she travelled with the Company of Seven under the alias Tasha.
Iggwilv is said to have once been named Natasha, and it is under this name that she was “adopted” as a child by the witch Baba Yaga. Under Baba Yaga’s tutelage, Natasha grew into a talented spellcaster, and soon became known as “Natasha the Dark,” perhaps in contrast to another adopted daughter of Baba Yaga, Iggwilv’s “sister,” Elena the Fair.
At some point prior to The Planar Wars Iggwilv summoned and imprisoned the demon lord Graz’zt. She managed to seduce the demon lord into helping her with her plans of conquest and went on to bear him a son, Iuz.
During The Planar Wars she was part of a pact of power between herself, her son Iuz, and the demon lord Graz’zt. At some point in the war she betrayed and destroyed Graz’zt, stealing his power for herself. Now having power that rivaled gods, she set her eyes on conquest. She had to put her schemes on hold however with the appearance of the illithid god that called itself “The End”. With Gods and Goddesses falling in quick succession to this new enemy she had no choice but to join The Last Alliance.
When The Last Alliance faced the judgment of The One, Iggwilv was stripped of her divine power along with the rest of the gods. Her last known location was somewhere in The Outlands.