Gez said:You can't make a coup de gras with an a flaming or acidic weapon. Both fire and acid would destroy grease rather than generating it. Since grease is inflammable, though, you could make a Coup de Flamme using an oleaginous weapon. You just have to provide the spark.
You're right on the other points of your post, though.
robberbaron said:As an aside, in an AD&D1 game some years ago, our party captured several Trolls and built a Troll-Press, to harvest blood from the continually regenerating creatures. It was needed for Healing potions and the Trolls were constantly taking enough damage to keep them unconscious.