Not sure if I just have a better build or not. But I remember this one orc drummer that I could never kill, even with my level 50 character (yes, killed everything and did all the quests before I moved on to become the divine). Even with the dragon armor set (or better armor) I was never able to kill the guy. This was the one orc drummer that appears when you follow the gold trail up along the Aleroth stream, I think it was above the orc camp. He had a ton of health and did tons of damage too, and damn do the drummers attack swiftly and accurately.
Also, I lied when I said that I did all the quests, I never did the 'Help lenny find shrimpo' quest or whatever it was called. Never could figure out what I was supposed to do and forgot where I got it, so yeah lol.
I'm sure that in the later versions of the game (gog, steam), these creatures don't exist anymore (i.e. have been nerfed).