Whisper was one of the Circle of Eighteen, a group which opposed The Lady and the Ten Who Were Taken. Whisper was a talented general and crushed The Lady’s armies in many battles. She was eventually captured and converted into a Taken herself.
After the fall of the Dominator and the loss of The Lady's power, Whisper was thought to have fallen with the other Taken.
Returning from their journey to the North, Otto and Hagop informed Croaker and Murgen that Whisper was one of the five surviving Taken still living under the Empire's domain, albeit stripped of her power.