In Gamma World there are certain effects that add bonus damage to each damage dice. eg plus +3 per damage dice would do +3 on 1d6 or 1d8, but +9 on a 3d6 roll. Obviously I could just have the player enter the total damage bonus, for each weapon. This gets a little confusing for them, IME, but not unpossible to do. Alternatively, I could separate the number of dice from the die type in the character sheet, then build the roll piece by piece. eg @{numOfDice}d@{dieType} + ((@{numOfDice}*@{perDieDmgBonus} ) + @{stdDmgBonus}) Ideally though, I'd rather do something like 3d(6+@{perDieDmgBonus} ) + @{stdDmgBonus} Obviously that does not work (it rolls a d9 instead), but hopefully you get the gist.