Rosemary Chambers was one of the fictional characters created by Jason after he was made Master of the Land of Fiction.
She lived in Arandale, was married to Phil Chambers and was a witch. When her husband was near, she had what appeared to be supernatural powers. This was because she could unintentionally tap into the power of the Force possessing Phil. She was able to destroy Doctor Nemesis with those powers before he could kill the White Knight. (PROSE: Conundrum)