As an action, you can make a melee weapon attack with a weapon that deals bludgeoning damage in an attempt to debilitate the creature. Add the stamina die to the attack’s damage (add half if you miss by 4 or less). On a hit, the creature must succeed on a Fortitude saving throw or it only deals half damage until the end of its next turn.
You can increase the damage for each additional stamina die expended. This augment also causes the creature to be debilitated for 1 minute/stamina die. At the end of each of its turns, a debilitated creature can repeat the saving throw, ending the effect on itself on a success.