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As for Firkraag, well, he's hard as nails, and only a combination of utmost skill, innovative use of spells and potions, and the right armour and weapons will give you a chance of beating him.
ALternatively, you could click to talk to him, and click everyone else to attack him. Firkraag will be confused and try to chat to you for the first 20 seconds or so while your team rain bows of death at him. He'll fight eventually, but if your team is any good, he'll be almost dead by then.
Complete Balders Gate guide.