Actually, I wholeheartedly recommend using Fire Elementals against...
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Spoiler
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... Firkragg, as they
HEAL from his Dragon's Breath. [img]tongue.gif[/img] They are one of the few summons that can last the entire battle. Remember, even if the Fire Elemental is not hurting Firkragg, neither is Firkragg hurting
YOU.
In other tips, keep all summons in front of Firkragg while your party melee members try to stay behind Firkragg. This is to avoid being Wing Buffeted, as it can be very annoying.
Take heed to boost your Fire Resistance to 100%+ as well. There are many low-level spells, potions and equipment that can help you achieve this.
Good luck, have fun.