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Message: <blockquote data-quote="Mand" data-source="post: 5218782" data-attributes="member: 90561">It seems quite clear to me that damage powers have the following structure:Hit:   ( [ (number)  (type) ] damage ) + ....Out of powers that have multiple damage keywords (not counting things like fear, charm, etc) there seem to be the following kinds:A:   (number) (type) damage + (number) (type) damage + ....B:   (number) (type + type + ....) damage.In case A, I think it's pretty straightforward that if a power deals [10 fire damage] and [10 cold damage] that someone immune to fire loses 10 hitpoints.  Note that I said loses ten hitpoints - "takes damage" is, I find, an annoyingly vague thing.In case B, however, the question is whether you need:Resistance to (type) OR (type)Resistance to (type) AND (type)I would argue that the resistance must match the damage exactly:  resistance to fire is not the same thing as to resistance to fire and cold, and is insufficient to prevent loss of hitpoints due to fire and cold damage.This, of course, brings up the issue that vulnerability and resistance are two opposite functions, but there is the explicit rule that the lower of the two resistances wins.  So, when you have vulnerability (fire) and resistance (cold), you will lose hitpoints equal to the initial damage plus your vulnerability, since your resistance is -5 for fire and 10 for cold, for example.  Without any resistance, though, something that is fire and cold damage is more versatile as either vulnerability (fire) or vulnerability (cold) will push the resistance to a negative number and cause greater hitpoint loss.The combination of damage types is unbreakable - (fire and cold) damage is not [(fire damage) and (cold damage)].  They specifically changed away from that early after PHB was released.  If you have 10 resist fire, you don't lose 10 hitpoints from 20 fire and cold damage, you lose 20, as stated by the rules.  You don't take individual points of damage up to the total, trying to figure out which are fire and which are cold.If you accept that (fire and cold) damage is not the same as [(fire damage) and (cold damage)], then you must conclude that you need immunity to both types to prevent all the damage.If you don't accept that, then there is absolutely no function to type B of powers, and we're back to the pre-Errata PHB, except with no rule *whatsoever* about how the damage is split between the two types.I hate to go all math notation on people, but it seems like the least confusing way of expressing things.</blockquote>

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