Um ive dueled a few of them and most of the time, their minions just made it so i couldnt get to the necro (i was using melee pally) and while i was fightin the minions he was raming spirits up my ass and i died pretty easily. Also revive should be maxed or put as many points as possible because, you could get some black souls, or some oblivion knights to do ur dirty work. But idk just a thought.