the ebony warrior! comes with the dragon born dlc i believe. can only fight him once you reach lvl 81. he will find you, usually in a city and he is literally the hardest opponent in the game. none of the other opponents ive come across have even come close in any of the dlc's (got all of them so far) ive not had to use health potions for a while so ive got about 80 ultimate healing potions and in this one fight i used about 6 of them. he has some decent gear but its not as good as it should be considering you can only fight him at lvl81 i didnt bother taking his loot tbh, felt like he should keep his dignity plus none of it is unique