Was farming Mojo with my gal and we decided to clear the place to get her the achieve - did fine on the first four bosses but got hung up on Hex Lord Malacrass - he healed the living crap out of himself - couldn't get him under 400k and finally gave up when fingers felt like they were going to fall off (surviving was no prob - just couldn't kill the SOB).
I'm a bear and she's a shadow/holy priest - any suggestions?