I should mention that my Glacial Cascade Witch is also half Necro, as I'm running with Raise Zombie... and, for the big fights, I LOVE Vaal Raise Skeleton!!!!! (with a Longer Duration support gem) Regular Raise Skeleton is kinda pitiful with just 2 skeletons for 20 sec, but Vaal Raise Skeleton raises a whole freaking army of them - perfect for popping those protected chests!
So...um... Incinerate, huh? I'll have to look into that! Right now I'm going to work on my Cleave/Dual Strike melee Scion, because my ranger found an awesome unique Tiger Sword that will be perfect for her.