New answers tagged critical-hit
The extra damage from these abilities can be applied after you hit a creature. In order to know if you've hit a creature, you (usually) need to know the result of your d20 attack roll. So regardless of whether or not the roll ends up being a critical, you can wait until after the die roll to apply the extra damage.
Yes You've already listed the related rules. Yes, additional damage dice are doubled on a critical hit. Yes, that means you can choose to smite when you see you've got a critical hit. Yes, it's pretty good.
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