The NEXT Generation of Adventurers: DnD 5E Discussion

When you score a critical hit, you get to roll extra dice

for the attack’s damage against the target. Roll all of the

attack’s damage dice twice and add them together. Then

add any relevant modifiers as normal. To speed up play,

you can roll all the damage dice at once.

For example, if you score a critical hit with a dagger,

roll 2d4 for the damage, rather than 1d4, and then add

your relevant ability modifier. If the attack involves other

damage dice, such as from the rogue’s Sneak Attack

feature, you roll those dice twice as well.