The Gleeful Grognard said: A +1 longsword crit would be 2d8 + 1 + str bonus A critical hit damage roll is 2x damage dice + 1x of all modifiers. At the moment when a critical hit is triggered it does 2x damage dice The following is taken from the basic rules pdf verbatim page no. 75 "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." Maybe I can help here as I think you two might be coming at it from a different perspective. So you are both right, but for different reasons I think this is the correct setup for use with Mark's sheet. you have 1d8 for the longsword and if its a crit, it gets an extra 1d8 damage. What The Gleeful Grognard is thinking is that the "Crit damage" should be 2d8 and it should add the ability/magic modifiers in there. @The Gleeful Grognard you want to use the base weapon damage in the Damage Dice (longsword 1d8) and you want to add whatever the crit damage would be, (longsword 1d8) it will then generate like this. So if this attack Crit, you would add the Red box (1d8+ability/magic mod result) + the blue box (1d8 result) Hope that clears it up.
