As a reaction, which you use when a creature other than you within 10 meters who can see or hear you makes an attack or saving throw roll, you can inspire it. 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.
You can inspire one additional creature for each additional stamina die expended. The creatures must be within 5 meters of each other.