High Dice Shortcuts

Canon GAFT requires actually rolling out the dice up to 12 dice. After that, you can multiply dice to approximate the sum of the actual dice if that works easier.

DICE METHOD

UP TO 12 12D6

13 3D6 x 1D6

14 4D6 x 1D6

15 5D6 x 1D6

16 6D6 x 1D6

17 3D6 x 2D6

18 4D6 x 2D6

19 5D6 x 2D6

20 6D6 x 2D6

21 3D6 x 3D6