Ran around a Dwarven Centurion for 10 minutes.... at level 37.
I had to do that with a Dwarven Sphere Master last night, all my gear had been confiscated so I had nothing but a damn pickaxe, so how the hell am I gonna kill him?, my character was built for melee and had no points in magic. I had to blast him with flame for all of three seconds till they ran out, use my shout, then hit him with a pickaxe a couple of times, run away, keep running, heal while running, run some more, run for five minutes till my magic replenished and repeat. I stopped once after 30 minutes and the thing one shotted me (did I mention I had no gear so instead of ebony armor I had rags on), I wasn't best pleased with that.