try lower resistance / harm.
Firt I cast lower res twice and then attacked one tank at a time. This gets over his wing buffet as you can always send the next tank to melee against him (seems to distract him) and you can heal injured tanks (potions). Then breach if he got spell protections and then lots of magic missile/ring of the ram/cone of cold/kitchen sink. I found poison and acid spells work nicely aswell (i.e. priest spell poison, melfs acid arrow).
I also had a couple of summons for extra distraction and lots of fire resistance/charm resistance magic. IMHO good AC doesnt really help against him.
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none shall pass...
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