Warlock (Warlock)

The Warlock is the titular villain of the supernatural horror film "The Warlock" and was a time-travelling practitioner of the Dark Arts who sought to gather the pages of a sacred text so as to gain knowledge on the "true name of God" which, if spoken backwards, would have the power to undo all of creation (basically destroying the world).

The Warlock's reign of terror switches from the middle ages to the modern era where he manipulates people into aiding him and disposes of any that get in his way - in the end the evil sorcerer is killed when one of the movie's protagonists injects him in the neck with salt water: the salt is lethal to the Warlock and he seemingly perishes.