High Quality Content by WIKIPEDIA articles! Rhea Dubativo of the Cöos is a fictional character who appears in several novels by Stephen King, most notably his Dark Tower series, as well as the comic book spinoffs of that series. Rhea is a very stereotypical fairy tale witch in appearance, personality and abilities; she is old, ugly, rides a broomstick and has a cat familiar. In The Dark Tower IV: Wizard and Glass, she is said to represent the Wicked Witch of the West from The Wizard of Oz.