When i beated firkraag, i simply casted many breach & pierce magic on him to remove his protections while hacking with Minsc and Keldorn. I summoned some beasties to distract him (wizard eye helps a lot, its immortal).
About protections, i dont know very well but the shields only grant you 50% fire res. I would look at the others and choose the one with the best relation between duration and fire resistance given.
LUCK !!! (sure youll need it)
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