'Mistress'

The Mistress is an individual that goes with the title of 'Sister' in the Unwaking Coven. She resides in the Shadewoods and uses crows to help her track and target individuals.
The Kaechaek Party know nothing else about the Mistress so far... though they did learn she had a temper and an earth shattering roar when Sigholdt killed one of her birds.