ARGUS

In addition to what the others have said...

You'll probably be running in circles long enough to know the zone layout pretty well. Plan ahead and know where the best places are to throw traps and maybe take some shots. Throw traps in bottlenecks where he has to hit them. Use totems to get you far enough away to take some ranged shots or regen.

If you've cleared the zone, you can enter the next zone to fill flasks, then return. If there are any necromancers, try to leave a few alive for filling flasks.

Kite him through traps, unless it was changed that's what I did with my ranger using blink and mirror arrow. He got hit by a couple of those giant swinging blades and dropped like a rock.

you could use minions. zombies and skeletons are really helpful