Darth Magnevus
Ok, so, We have the Gravemind, a zenocenik being who is litteraly composed of the bodys of his enemys, who, if the explanation is correct, is able to use all of the human mind and has absorbed some forerunners, and we have Thrawn, the greatest tactical geneous in the history of the starwars universe who has battle precognition, enableing him to see your move before you do it.