As an action, you can make a weapon attack and shout a war cry that victory is at hand, stoking the fires of battle. Add the stamina die to the attack’s damage (add half if you miss by 4 or less). On a hit, the next attack roll against the target by an attacker other than you has advantage if the attack is made before the start of your next turn.
You can increase the damage for each additional stamina die expended.
You can expend 3 additional stamina dice to cause all attack rolls against the target by an attacker other than you to have advantage.