The Warlock — Marc Olden

The Warlock ruled an occult empire that stretched around the world. This evil genius giant of a man with his slavelike army of hideous killer dwarves, gorgeous women, sadistic perverts, and all the other devotees of his devil-worshiping religion now reached out to grasp ultimate power over all the nations of the earth. Satan was in the saddle and was riding mankind to doom -- and only Robert Sand, Black Samurai, could hope to exorcise this monstrous threat, or else himself be thrown screaming into the bottomless pit of soul-destroying pain and body-mangling death...