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The one tidbit that I'm moved to add to the conversation at this point is this:
If you put a creature up against your players for them to battle and a natural 20 won't save against its breath weapon, it starts to look less like a "monster encounter" and more like a "plot device with feet". I'm not saying that the party should never run up against an adversary that can't be saved against on a 20 (or can't be hit on a 20) but it seems likely to cause friction if it happens too often. I can certainly see it being interpreted as a "I'll show YOU who's boss" sort of situation, especially among siblings.
If you put a creature up against your players for them to battle and a natural 20 won't save against its breath weapon, it starts to look less like a "monster encounter" and more like a "plot device with feet". I'm not saying that the party should never run up against an adversary that can't be saved against on a 20 (or can't be hit on a 20) but it seems likely to cause friction if it happens too often. I can certainly see it being interpreted as a "I'll show YOU who's boss" sort of situation, especially among siblings.