As an action, you can make a melee weapon attack with a natural weapon that deals piercing or slashing damage in an attempt to tear the creature’s tendon. Add one 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 is slowed 1 for the duration and while affected it loses health equal to one of the stamina dice for every 1.5 meters it travels.
A creature can repeat the saving throw at the end of each of its turns, ending the effect on itself on a success.
This has no effect on any creature that cannot bleed or lose a vital liquid substance.
You can increase the damage for each additional stamina die expended and the slowed level by 1 for every other additional stamina die expended.