This form of Slaanesh is a former inquisitor turned Deamonette Immortal that is extremely powerful. She can use the power of Slaanesh's Voice to seduce her enemies into fighting for her. Even without her seduction powers, she can easily kill almost any enemy with her fighting capabilities. She is very strong and very good looking. She has a Champion of Slaanesh, a former Sister of Battle Celestian, that assists her in most tasks and guards her with her life.

In case you have to know who Slaanesh is:
Slaanesh is the Chaos God of lust, pleasure, desire, and excess. In both settings, he is the youngest of the four gods; he is typically considered androgynous, and while he is usually referred to as being male, in the Warhammer 40,000 universe, the Eldar races consider him to be female. His Dark Tongue name, "Slaaneth", means the Prince of Pleasure. His followers seek only to indulge in whatever fleeting whims and desires they feel, and they tend to become graceful, beautiful warriors who harbor selfish, cruel souls. In the Warhammer 40,000 background, he was birthed from the excesses and hedonism of the Eldar society. His birth created a psychic shockwave that spread across the galaxy, killing most of the Eldar population and their gods; the survivors split into the various Eldar factions. It also created the largest warp storm in the Milky Way, the Eye of Terror, which later became the main residence of the scattered Chaos Space Marines. The fall of the Eldar empire paved the way for the rise of the Imperium of Man. In Warhammer Fantasy, his followers are partly responsible for the corruption of an important Elven leader named Malekith, and the subsequent schism that led to the formation of the Dark and High Elf races. His physical form is an androgynous being of the most physical beauty. His holy number is 6 and his main enemy god is Khorne. Those who worship Slaanesh are those who either wish to achieve the most popular amongst their fellow men or the ecstatic pleasure, pleasure beyond imagination. His main daemons are the Daemonettes (his soldiers), the Fiends (his beasts), and his Steeds (his serpentine mounts). They are led by Greater Daemons called the Keepers of Secrets, lithe creatures with unholy beauty. His realm is described to be a massive castle in the middle of seven circles, each representing one of the classical seven deadly sins. People cannot make it through without succumbing to some type of flaw.