Air Elementals In Reaver's Fate

Why are the Air Elementals in the Reaver's Fate (on Elite) so difficult to Finger of Death? Is it because they have such a good saving throw or is it because they have such a good spell resistance?

I'm just trying to figure out the best way to kill them. Right now I hold a Necromancy Club (+1 to Nec spell DC) and a +7 Spell Pen Club. But I generally end up killing about 4-6 per quest. I have also tried Enervation (sp?) first.

I think they have ridiculous saves. I usually have to enervate them 3 or 4 times before I can kill them with FOD. I find the best thing is to set up dancing balls, cloudkill, and firewalls under the archway. It takes longer for them to die, but I usually max, empower, extend, heighten them since mana usually isn't a problem in there. The hard part is keeping the Reaver out of there, he tends to displace aggro from the tank more recently.

They cranked up the saves to stop the reaver from being such a cake walk. Like Fayth said cloudkill and firewall are the best bets. The rangers should be using w/p. This approach of course becomes obsolete if the new mod ever comes out. Deviating from the rules /sigh. By the way the giant aggros on whoever hits the ground first after the ceiling ride. He also will aggro from any spells near him like ottos sphere or CK, etc So a good tank knows to get back to buisness quick! Alot of casters like to get the charge right away so they dont get knocked down. Not the best idea ive seen alot of them eat dirt before the raid is even off the ground.