As a reaction, which you use when you or a creature that you can see within 1.5 meters of you is hit by an attack that you can see, you can block the blow with your shield or weapon. Roll a d3 and add the result to your Defense or an adjacent ally’s Defense against the triggering attack. 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.