As a reaction, which you take when you make a weapon attack roll against a creature, you can strike precisely. Until the start of your next turn, including the triggering attack, you have a +1 bonus to attack rolls.
You can use this maneuver before or after making the attack roll, but before any effects of the attack are applied.
You can expend 1 additional stamina to increase the bonus by 1.
You can expend 2 additional stamina to increase the bonus by 2.