Yxunomei

Yxunomei was a marilith and one of the main enemies in the Icewind Dale (game).

History
The demon, Yxunomei, operated from Dragon's Eye to perform her vendetta on her immemorial enemy: the baatezu Belhifet, or known as the "Old Enemy". When Yxunomei arrived to Prime Material Plane after Belhifet was banished from Baator. In 1281 DR, Arundel, archdruid of Kuldahar, sent a messenger to Easthaven, asking for help. The answer came in the form of a group of adventurers who began investigating the areas are Icewind Dale. The heroes made their way into the Dragon's Eye fortress, destroying the marilith's army, including the Talona priest, Presio, and eventually met the demon herself, disguised as an "Odd little girl". Yxunomei refused to give up the Heartstone Gem and is eventually slain by the adventurers.

Lair
She chose Dragons' Eye as her base of operation, and began gathering an army built of lizardfolk, Talona followers, various undead, and yuan-Ti. The necromancer, Presio, resided on the third level of Dragon's Eye leading the undead horde and gathering information about Belhifet and his allies.

Personality
Yxunomei's actions were, as Belfihet would say, poorly hidden; they included abductions of Kuldahar residents and weather disturbances. She also made her Talonians steal the Heartstone Gem artifact from the Temple of The Forgotten God, which was supposed to be used to reveal Belfihet's location and forces. When confronted by the heroes of Icewind Dale, she claims in her world conceptions of man and woman, adult and child, they have no meaning and do not matter during war. Overall, the form of a little girl served her well, because material plane inhabitants tend to feel sorry for children.

Combat
Despite her resistance to magic, Yxumomei can be stopped by area spells like Web and Entangle, and she is vulnerable to moderately powerful weapons.

Icewind Dale II
In Icewind Dale II, it is revealed that the women of Kuldahar had been impregnated by Yxunomei's yuan-Ti. They later gave birth to girls-only crossbreds, with yellow eyes and green skin.