As an action, make a melee weapon attack that deals slashing damage to cripple the creature.
On a hit, add the stamina die to the attack’s damage and the creature must succeed on a Fortitude saving throw or it is slowed 1 until the end of its next turn.
On a critical hit, add twice as much damage.
On a miss by 4 or less, add half as much damage.
Enhance
You can augment this maneuver with the following options, expending stamina dice for each option.
You can increase the damage for each additional stamina die expended and the slowed level by 1 for every two additional stamina die expended.
You can expend 1 additional stamina die so the creature is slowed for 1 minute/stamina die. A creature can repeat the saving throw at the end of each of its turns, ending the effect on itself on a success.