Randall Flagg

Randall Flagg is a fictional character created by American author Stephen King, who has appeared in at least nine of his novels. Described as "an accomplished sorcerer and a devoted servant of the Outer Dark", he has supernatural abilities involving necromancy, prophecy, and influence over animal and human behavior. His goals typically center on bringing down civilizations through destruction and conflict. He has a variety of names, usually with the initial letters "R. F." but with occasional exceptions, such as Walter o'Dim and Marten Broadcloak in The Dark Tower series.