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If I'm not mistaken, you can't apply a fire trap. It will cause an error during combat. Someone mentioned it in the AI topic. But poison and stealing are definitely possible! Maybe give them a slowing effect? That spell would fit the assassins' theme. Slow them down and quickly finish them off! Or apply weakness. Any debuff would work, but you shouldn't forget about the AI's tendency to cast such spells. It will spend half the battle casting...
