This guy really isn't that hard I just barely dinged 70 and was able to do him with no problems everytime. Line up by the door drop all your totems pop hero + 5x earth ele and blast away. I get him to about 20-30% before first MC, and then kill him after MC (pop another heroism). I usually don't lose anyone but once in awhile 1 shaman will go down in the first MC.