Roll the dice and add up their value, adding or subtracting any modifiers that apply to the check. If a card is vulnerable to any number of traits that are used on the check, add 4. If a card is resistant to any number of traits used, subtract 4. No matter how many penalties are applied to a roll of the dice, the result cannot be reduced below 0.
Powers that allow or require you to reroll dice happen now; each such power can reroll dice no more than once per check. You may spend a hero point to reroll the dice once, on your own check only. If a power tells you to reroll dice without specifying which ones, reroll them all. You must take the new result unless the power says otherwise.
If the result is greater than or equal to the difficulty of the check, you succeed. If the result is lower than the difficulty, you fail.