The heal sucks, but don't forget that they have the debuff, "balance of power" which means they all share the same health pool, so if you can kill one, you will have killed all of them. focus dps on a target that doesn't do any little tricks this or anti magic that. go after the pally, he is always up, never disapears, and doesn't have an annoying magic shield or immunity that he casts. you can ignore the rest minus healing the damage done. gl though :P