Without beeing an expert, I'd like to raise the question of your favourite characters arch nemesis.
So far I made it to lvl 24 and last game I died in the Dark Crypt. I refuse to ignore a Lady's call for help.

And as much I hate those elven mages who weaken me, I hate another foe even more.
Tom, hobbit rogue, hate elite archers with pinning attack.
They deal a tremendous amount of damage with those double shots and if one is pinned, it is very very dangerous.
Not only that, they run away those cowards. Run until they get a clean shot.
What is your favourite characters arch enemy?
Tom