As a reaction, which you use when you make an ability check or saving throw to avoid being pushed, knocked prone, or grappled, you can sturdily position yourself. Roll a d3 and add the result to the roll. You can do so after the roll but before any effects of the roll occur.
You can expend 2 additional stamina dice to roll 2d3.
You can expend 4 additional stamina dice to roll 3d3.