David pointed out in the sheet above why the roll is made the way it is. There is no way in roll20 to do the dice rolls as they are in the rulebook. If someone wants to update the sheet's rolls, there is a way to modify the dice roll to get the special effect of 6, and keep the correct odds, using using the failure check system from the Dice Reference page . You'd replace each roll like this [[{@{academics}d6!}>4]] with [[{@{academics}d6!}>6f<3+@{academics}]] This is a little convoluted because of the limitations of roll20s dice mechanic, but will generate the correct result treat successes 4, 5, 6, and counting 6s twice.