Rhea Dubativo, more commonly known as Rhea of the Cöos, is a witch who makes her appearance in Wizard and Glass. She was one of Roland's most formidable enemies during his time in the town of Hambry. She lived on Cöos Hill outside of Town with her two mutant pets, Ermot and Musty. Like the men of the Horseman's Association, Rhea played a part in the defeat of the Affiliation.