You can add "Overlord Meta Muram" to that list. He is the final boss of the Omens of War expansion for the original EQ. If I remember correctly we had only beat him at most 3 times and he was still a real bitch 2 expansions later. Not sure how easy he is for current guilds (with extra levels and spells available now) but when he was released he was one tough MFr and I am glad I had a chance to whoop his ass before people started sharing strats and ruin the challenge.