As a bonus action when you hit a creature with a melee weapon attack that deals slashing damage, you can cripple the creature. The target must make a Fortitude saving throw.
On a failed save, add the stamina die to the attack’s damage roll and the target is slowed 1 for the duration.
A creature can repeat the saving throw at the end of each of its turns, ending the effect on itself on a success.
You can increase the damage for each additional stamina die expended and the slowed level by 1 for every other additional stamina die expended.