As a bonus action when you hit a creature that is your size or smaller with a melee weapon attack while you have at least one hand or appendage capable of grappling (GM discretion) free, you can attempt to grapple the creature. The target must succeed on a Reflex saving throw or be grappled.
You can target a creature of a larger size for each additional stamina die expended. Additionally, on a failed save, add the additional stamina die to the attack’s damage for each additional stamina die expended.
On a successful save the target takes half as much damage.