Rhea of the Cöos

Rhea Dubavito more commonly known as Rhea of the Cöos, is a major villain in The Dark Tower series by Stephen King. She is the secondary antagonist of the novel Wizard and Glass and its graphic novel adaptation Gunslinger Born. She is a cruel and malicious witch.

Early Life
Rhea was born long before the start of the series, in a Barony called Delain. She was cunning and spiteful, and resolved to be the strongest person possible.

She spent time in a swamp and her eye was pierced by the Laughing Mirror, which gave her the ability to use magic. She spent the rest of her time moving from village to village, pretending to be a wise woman but actually cursing them. Eventually, she was about to be killed, so reached out to The Crimson King, who saved her and told her to move to Hambry.

Wizard and Glass
John Farson instructed the Big Coffin Hunters to give Rhea Maerlyn's Grapefruit. She becomes obsessed with the sphere, even to the point of losing her health and life energy. Susan was sent to Rhea to prove her virginity. When Rhea started touching Susan inappropriately, Susan threatened to kick Rhea into the fire. In revenge, Rhea hypnotized Susan to cut off her hair after the first time she had sex. However, after she had sex with Roland, he stopped her, and discovered that Rhea had hypnotized Susan. Roland went to confront Rhea. She sent her snake familiar, Ermot, to attack Roland, but he shot it. Rhea vowed revenge against Roland, as well as Susan. Rhea sent a letter to Sheemie for Cordelia Delgado, to tell her Susan was sleeping with Roland. However, Cuthbert intercepted the letter. Eldred Jonas came to take back the Grapefruit. Rhea refused to give it up, so she traveled with the sphere. She told Jonas where to find Susan. Eventually, Jonas took the sphere from her, and she vowed to kill Susan. Rhea went to Cordelia and drank her blood to regain life energy. The two of them took Susan to the Reap Day festival to be burnt alive. Later, when Roland brought the Grapefruit home, Rhea appeared in an image in the sphere. Roland believed she was there and tried to shoot her, but shot and killed his own mother instead. Rhea's ultimate fate is unknown, however, it is implied that Roland killed her at some point.