Just ran this on EE, and nothing was landing. The fire reavers especially are problematic, because they are immune to Web, and I couldn't land a Hold even after hitting them with some debuffs. My Enchant DC is 74, and Necro is 81.
Did a search and found an old Lamannia thread discussing this very topic wherein I saw this post:
I don't know if things have changed since then, but that seemed about right--so, what is a Wizard supposed to do here? Prepping with Crushing Despair, I'm still not landing Hold, Web doesn't work, insta-kills don't work, running them through a Symbol of Death wasn't really working to help me land anything else. Neither was Cloudkill. Sure, a warlock has Black Tentacles, but what are wizards doing here? I can nuke them, but that drains mana too fast to sustain for the whole quest.
Personally, I think it's pretty ****** to put a super-high Fort and Will save on something that is immune to the Wizard's only real Reflex-based crowd control spell.