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The things I would do for an extra fire resistance for magi truly are sickening.
Hence why I said Lothiac. It was a bad example I suppose, but I've always seen holocaust a bit like Kaido Deliverance. It's about anticipation, timing, psychology, etc. When used intelligently, it's incredibly powerful.
Just remember that no other classes can do what cata does, and that is give someone a writheable aff and put out massive amounts of damage. Transfix alone is worth spinning it up.