Here's what I would do: summon a bunch of creatures *before* you enter the chapel. Cast improved invisibility on your mage, who you have had memorize a ton of fireball spells. Position the summoned creatures in the doorway to act as shields for a while. Send your mage in to just before the point where Torgal smells you. Have the mage cast fireball after fireball. All the trolls will take some damage. Once Torgal smells your mage and starts chasing him, have the mage retreat behind the summoned creatures.
Those of your party who have bows should be standing back and shooting with fire and/or acid arrows. Keep replacing the summoned creatures as they die, until you have run out of summoning spells. By this time, the combo of fireballs, fire arrows and summoned melee damage should have weakened Torgal & friends enough for your melee guys to wade in and finsih the job. Remember that fire or acid will be necessary to permanently kill any troll.
Good Luck!
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