Some abilities, powers, or effects add boost dice or penalty dice to an ability check. This is written as “Boost-“, “B”, or “Penalty-“, “P”, followed by the number of dice. For example, Boost-1 (B1) adds a single boost die, and Penalty-2 (P2) adds a two penalty dice.

Boost and penalty dice directly cancel each other out. If an effect adds B2 and another effect adds P3, the final effect is P1 (3 penalty dice minus 2 boost dice equals 1 penalty die).

Boost and penalty dice should always be a different color or design from the dice rolled for an ability check so they can be easily identified.

Boost Dice

When using boost dice, roll the boost dice alongside the regular dice. Then discard the same number of dice from the roll, removing the lowest values from the roll.

Penalty Dice

When using penalty dice, roll the penalty dice alongside the regular dice. Then discard the same number of dice from the roll, removing the highest values from the roll.

Other Dice and Boost or Penalty Dice

Not all dice are six-sided; a standard set of role-playing dice include four-sided, six-sided, eight-sided, ten-sided, twelve-sided, and twenty-sided dice. Other dice used as boost or penalty dice behave in exactly the same way, replacing the lowest or highest value regular die rolled.