Drag a die to add/subtract.
Boris Woloszyn: Artwork, concept, rules, and creative lead.
M Jake Pushie: Consulting, quest design, rules, and app design.
© 2026 Westfalia Miniatures
Umbraal is brutal and unforgiving, but the dice are fair.*
| D6 | D10 | |
|---|---|---|
| throws | 40,000 | 40,000 |
| per-face deviation | −1.5% / +2.4% | −3.5% / +3.0% |
| χ² faces | 5.7 df 5 | 11.2 df 9 |
| mean of two | 6.985 / 7 | 8.980 / 9 |
| sd of two | 2.407 / 2.415 | 4.088 / 4.062 |
| χ² independence | 34.3 df 35 | 96.3 df 99 |
* based on dice physics.