Surprise, there is actually a spot where you can grind endlessly for exp, and the mobs don't stop. (Well, for the most part.) The quest in aleroth chapel where you have to defend Zandalor for 60 seconds. I went from just below level 30 to level 33 before I finally got lucky enough and the enemies backed him into a corner where they couldn't him anymore. Oh well, that's that I get for going pure melee I suppose.