For any system that uses proprietary dice you pretty much end up having to create a Rollable Table and adding your own custom images for each 'Face' of the table/dice. Alternatively, since you're already a mentor, you can use the API to run a dice script for it. (example that may or may not be current: <a href="https://app.roll20.net/forum/post/173429/script-ed" rel="nofollow">https://app.roll20.net/forum/post/173429/script-ed</a>... )