Need Help with dice formula

Hi all, I'm working on a custom sheet for Dreamscape: Laruna. It uses a 2D10 system where 1D10 is positive and 1D10 is negative. The two dice are rolled, added together and then that is added to a total skill. There's a caveat that if double 1s is rolled, the result is a -12, and if double 10s are rolled, the result would be +12.  So far, getting it to roll together is not a problem but trying to have the system differentiate 1-1 = -12 and 9-9 = +12 is another matter. Would anyone know how to put this into practice (or know if it's even possible with Roll20)? Thanks!

You would need a custom API script to handle this. It cant be done with standard dice rolls. The Power cards API might be able to handle it - there is a Power Cards thread, I'd suggest asking there. As an alternative you could replace the dice roll with a rollable table, where you put the bonus and in the weight column, the number of times you get each result. For this roll those values are Bonus Weight -12 1 -9 1 -8 2 -7 3 -6 4 -5 5 -4 6 -3 7 -2 8 -1 9 0 8 1 9 2 8 3 7 4 6 5 5 6 4 7 3 8 2 12 1