As a reaction, which you use when you make an attack roll, an ability check, or a saving throw or when you are hit by an attack you can see, you can twist fate. Roll a d3 and add the result to the roll or to your Defense against the triggering attack (your choice). You can do so after the creature rolls 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.