Iggwilv aka Tasha

Iggwilv, also known as Tasha or Natasha, and the alias Zybilna, was an Oerthian archmage and demonologist. She famously wrote the Demonomicon of Iggwilv, a tome on demonic lore.
Tasha was part of the Circle of Eight in their fight against Acererak and credited as MVP in the fight itself putting the final nail in the banishment coffin of Acererak.
Later in life she created her own Domain of Delight in the Feywild, and ascended as one of the plane's powerful archfey.

Appearance

The exact appearance of Iggwilv was unknown to many. Some described her as a ravishing beauty, while others claimed she was a bald and hideous crone. In fact Iggwilv was quite beautiful in her youth with raven hair that eventually went stark white. Even after becoming an archfey, she still retained a human-like appearance.

Relationships

Iggwilv was considered one of the most powerful beings in the multiverse, on par with demon lords. Iggwilv had many confusing relationships with the demon prince Graz'zt. They were both lovers and enemies, their relationship constantly changing. Both have at various points been the consort, prisoner, and master to the other. While they had almost no trust between them, they also held no secrets from each other. Both Iggwilv and Graz'zt sought to use or betray the other, yet also supported or even rescued one another when in peril, and in their own twisted way, both genuinely shared a bond of love with the other. Iggwilv believed Graz'zt was the only demon worthy of her gaze while she was the only consort of Graz'zt that inspired feelings of jealousy (as evidenced when he attacked Fraz-Urb'luu).
While held prisoner by Graz'zt in his plane of the abyss, Iggwilv bore him many children. Graz'zt quickly and securely placed them in various locations and protected their identities from any beings that could bring them harm.
The witch queen was an enemy of the Nine Hells, owing to her partial interest in Graz'zt. She had a quasit familiar named Iggrik, who acted as her spy. She was very wealthy, and had mansions throughout the material plane, the Abyss, and Hades. Each was guarded by an army of dretches, manes, and shadow demons. At one point she had four arcanaloth apprentices.
Iggwilv was the adopted daughter of Baba Yaga, the archfey sorceress known across the planes as the 'Mother of All Witches'. She had three adoptive sisters that together formed the Hourglass Coven, Bavlorna Blightstraw, Skabatha Nightshade, and Endelyn Moongrave.

I can't tell you how many times I've burned everything to the ground and started over.

Iggwilv, under her pen name Tasha

Aligned Organization

Circle of Eight

History

Iggwilv was born in the world of Oerth and was adopted by the witch Baba Yaga, at which time she was known as Natasha "the Dark". She became known later as Tasha, before adopting her alias of Iggwilv, although it was not clear whether any of those was her original name. It was at that early point that she was credited with inventing the Tasha's hideous laughter spell. At one point she moved to Niflheim, the second layer of Hades.
Some time later Iggwilv settled in the Abyss and immersed herself in the study of demon-summoning and lore regarding demonic spirits. She sought to garner more power for herself, but made many enemies among the chaotic fiends and fled to worlds beyond for her safety. Eventually, Iggwilv moved to her own Domain of Delight, known as Prismeer, in the Feywild, where she ruled from the Palace of Heart's Desire in the guise of Zybilna. Over time she transformed into a fey being and refocused her studies on that newfound state of existence rather than demonology.
She was eventually betrayed by the three daughters of Baba Yaga, the hags of the Hourglass Coven, and their cronies in the League of Malevolence, who used the magic of her personal cauldron to freeze in time the Witch Queen and many of her palace's other inhabitants.