Arcane resist for the Curator fight, well that isn't really necessary. A lot of people call it a gear block and it is, dont get me wrong, its not that big of one though, you just need fast focused DPSers who don't panic when they get hit, clickers beware. Proper balance of healers with pot use helps as well.
You don't see arcane resist needed again until Solarian which has been nerfed to the point that you dont really need it.
If you need arcane resist for a heroic, well than you have problems greater than needing arcane resist.
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Bode - 100 Holy Paladin - Lightbringer