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Message: <blockquote data-quote="Harzel" data-source="post: 7218149" data-attributes="member: 6857506">It's an interesting idea, but as others have pointed out you would essentially be eliminating immunity.  As for resistance, if the damage roll is a single die (1dn), then the average value for rolling twice and taking the lower is (n/3)+(1/2)+(1/6n), whereas half (for resistance) of the average single roll is (n/4)+(1/4).  So a) the average damage is actually greater using 1dn drop lower; and b) how is rolling two dice and taking the lower cleaner, simpler, or more elegant than rolling 1 die and dividing by 2?  Also, if the damage roll involves multiple dice, you need to figure out exactly what you mean by advantage since there are multiple possibilities that will produce very different distributions.  For instance, others have mentioned the 8d6 roll for fireball.  You could roll 8d6 twice and take the lower, or you could roll 16d6 and take the lowest 8, or you could roll 2d6 and take the lower eight times.  And those are just the more obvious variations.So, it's an interesting idea, but I'm not sure I see a clear advantage.</blockquote>