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Message: <blockquote data-quote="Al" data-source="post: 418112" data-attributes="member: 2486">Alchemist, I assume that Celebrim was referring to Chlorine not being an Element (as in, no Chlorine Elementals) rather than an elemen (i.e. chemical element).  Although annoyingly enough, there are no acid elementals either.Back on the main topic, the issue of acid damage vs. hardness is fine if you use a 'fantasy acid' model.  Using a 'realistic acid' model, it is more difficult.  All acids have a 'maximum' strength (usually around 17M), so if the gemstone won't dissolve in that, it won't dissolve in any form of (that particular) acid, no matter what the damage.  Conversely, gemstones subject to reaction with certain acids will usually go if the damage is significantly less.  The damage itself could be explained by quantity of acid in combination with molarity (strength), so a 100 point breath weapon could simply be twice as much volume as a 50 point breath weapon without actually being 'stronger'.  Unfortunately, this flies in the face of 'acid resistance'- which, if working in real chemical terms, can resist 1 litre of acid pretty much as well as 10 litres, assuming they are the same strength.Given that this is 'fantasy' though, and given the parameters implicit in acid resistance, it's probably just easier to use the damage/hardness routine.  DnD is a game, not a chemistry lesson.</blockquote>