Advantage and disadvantage is just rolling two dice at once. Advantage takes the higher roll and disadvantage takes the lower one. Criticals and failures are calculated after determining which die is used.
So with advantage, the only way to roll a one is to roll ones on both dice. The opposite is true for disadvantage. You need two 20s for a critical.
And they can cancel out if you have both; basically it becomes a regular roll. You also can’t have double advantage or disadvantage.
Criticals are either double damage or rolling damage dice twice.
Last edited by spectralhunter; 06/03/21 12:55 AM.