Who is Grissoul in the novel, The Taggerung?

Grissoul is a fortune-telling seer, who serves Sawney Rath and later Ruggan Bor, the leaders of the Juska. She uses magical methods to foretell the future and has great influence over Sawney, telling him where to find the Taggerung and giving him advice on what he should do. Grissoul plots with Antigra to take control of the clan and to place Gruven at the head of it after Antigra kills Sawney. Later, she serves as a seer to Ruggan Bor after he takes over the clan, although she shares the duty with another fox.