Draw them out one at a time and concentrate all your party on one troll. When he is down , make sure you hit him with fire or acid to finish him or else he will regenerate. Try chromatic orb after Greater Malison as it can petrify or kill at higher levels. At lower levels it will stun them out of the action for a while. If more than one troll attacks, use elementals, monsters etc to occupy them whilst you use your party to kill one at a time. If you attack too many at once, you may find they heal faster than you can dish out damage.
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