Boss advice: Hit and run tactics, but a litte bit more indepth for each weapon type: Sword - Usually the knockback should be enough to avoid the hit, but go back a few steps to be safe. Look for where he teleports in order to avoid a surprise attack. Dagger - Run up and hit about 3-4 times before backing off. This will give the most damage output while avoiding being hit. Staff - The easiest, but also the longest of the three. Run, shoot 3 times, run a bit, shoot 3 times, spam special, and it's a cake walk.
I wish there was a way to separate 2 copies of an item, i.e. if I had two Hell Hunter's sets, I wish I could put my Muurnin Runes on one set and my Perliris runes on the other. It would be nice so that both sets could have runes that do more damage to their respective classifications