Step 1) Use priest to cast magic resistance on Firkraag. He will not become hostile
Step 2) Have some summoned creatures ready. Place them in front of the dragon.
Step 3) Move you party, except your mage, out of Firkraags Line of Sight.
Step 4) Cast lower resitance. The dragon will become hostile and attack your summoned monsters.
Step 5) Cast Flesh to Stone, Disintegrate, Finger of Death and whatever.
Step 6) Celbrate by dancing on the dragons dead body and drinking his blood.
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We call him Bobby Corwen