John French
The Maiden of the Dream

Mylasa Yaygus is an enigma, her origins a mystery even to her master, the Inquisitor Covenant. She is the Maiden of the Dream, a psychic torturer and manipulator of consummate skill, but amongst her many lives and histories is there a mote of truth that reveals who she really is?
Warhammer 40k
short

Also in:
The Horusian Wars: Divination