I don't really have a "main". Instead I have 5 guys I can switch back and forth with.

If melee are getting close then drop 5 magma totems and earthbind, then frost shock and run. Thunderstorm is your friend but you are also going up a geared 70 which means they probably have a crap ton of res and you are not going to get anywhere with them.

Oh yea lightning shield is nice as well.