Tom, I'd be glad to help you, but have you tried a search on this subject? There have been countless threads about this and the responses there are probably much better than the ones I could give
So please just use a search. One useful tip though; when Firkraags circle is still cyan in colour (i.e. when he's not yet in attacking mode), a very useful spell is the 5th level priest spell Magic Resistance. Because of Firkraag's very high resistance, this normally defensive spell will actually *lower* his resistance without making him turn "red". Alternatively, use the 5th level mage spell Lower Resistance (note that this WILL turn him red)
Good luck!!
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Melusine, Archbabe of the OHF and the LH
Your voice is ambrosia