With the way I play games I would probably be over leveled by about 5 levels so about lvl 35. I would use twin blades with ice damage on them because they cause more damage faster, and if used right are effective at blocking. I would be warrior class of course, but have one or two novice lightning spells. Since I am always over prepared I would have a stock pile of healing potions, and I would just rush in with no strategy.
Now if I lose the first time then I will fight him one or two more times to learn his pattern, and I would charge back in and win. I am usually a lone wolf in these games.
(I just realized that I explained what I did in Skyrim )