Exploding dice for critical failures

My system uses d10 and uses exploding dice for critical rolls and failures. But I don't know how to achieve that rolling ones subtracts 10 from the score (Instead of adding 1). Any help help would be appreciated.

What you're after may not be directly supported but you may be able to get something statistically equivalent. Can you describe how the exploding dice work in more detail? Can the d10 explode multiple times? such as a roll 10, 10, 3 Can failures explode into crits and vis-versa? such as 10, 1, 10, 5 for a total of 15 (+10 -10 +10 +5) Do you always roll 1d10 or can it be multiple?

Yes, yes and only one. Everytime you roll only 1d10 but can explode potentially infinite if it only lands on 10s and 1s.

Also, thank you so much for your attention <3

As I suspected you'll need something equivalent. 10*{d10=10f9!>9cf9d1} + d9r1cs0 The first part handles the explosions; luckily the crits and fails are negatives of each other so we can just multiple the net amount. 9's are used as the fail target so it can be included alongside 10 for explosions but it doesn't change the outcome/probabilities. The second part handles the final non-exploding value from 2 to 9. The dice roller doesn't have the support to handle it directly on two features. However there are two suggestions that would provide those features Rewrite the dice roller , this would allow multiple exploding values to be specified and not just a single range Custom dice syntax , this would allow dice where the 1 was swapped with a -10 Consider adding your voice and vote to these suggestions.

IT WORKS! Thank you so much. I will add a vote to the suggestions. And I can't thank you enough!