You can also be a boss and walk through the front door and still win it.
Run up, teleport him near your party, gank him and use warlord to gank the nearby melee skeleton (or CC him and ignore him) and then kill the wizard to the right while ignoring the archer.
The big blue dude should be one shotted by the time you fight him if you're appropriately geared for that game plan. Levels don't really matter that much.
My party at the time was double castard, double melee (rogue/knight). Zero gimmicks other than teleport.
Alternatively, you could just phoenix dive and wreck him anyways.
With Rage + Sacrifice of Flesh there really isn't any need for tactics.
