Interrogator Quinn

Our current Big Bad.

She was raised by Inquisitor Cyclopis as his protege interrogator, during which time she seems to have not only learned from him, but surpassed him in her desire to commit grave heresies. Got captured by the Adepta Sororitas but her strange xenos psychic capabilities prevented the Sisters from detecting any taint in her.

Capable of sending out psychic fragments of her personality to possess people and bend them to her will. Makes her a terrifyingly effective spymaster. Has control of a fleet of escorts and a couple of light cruisers, crewed by a genestealer cult under her sway.

Her crimes:
 * Led the Dark Angels to our auction of the Kraken Tooth and tried to kill us by turning into a tyranid nightmare.
 * Sent Lictors and Genestealers after us - busting up a meeting between Cornelius and Harlocke, infesting the Allure, and causing us all kinds of trouble on the archaeotech station.
 * Created the Pink Ork as part of her experiments with mind fragmentation.
 * Raising a genestealer cult and trying to take over Inquisitor Cyclopis' dangerous experiments for even more insane and malign purposes than he originally intended.
 * Using Rosalind to infiltrate our organisation and lure us into a trap

We tried to hunt her down in the Emperor's Halo but the warp journey went bad and we ended up missing three years in the material world. Quinn got away, obviously, and now seems to be seeding genestealer cults all over the place.