You can take a Bonus Action to inspire another creature within 60 feet of yourself who can see or hear you. Give that creature one of your unexpended Battle Dice. A creature can have only one Battle Die from this maneuver at a time.
Once within the next minute when the creature fails a D20 Test, the creature can roll the Battle Die and add the number rolled to the d20, potentially turning the failure into a success. A Battle Die is expended when it's rolled.