Sunder Down Under

Use this ability twice per day, and no more
than once per hour. You reach out your feet
with marsupial dexterity to smite an enemy's
genitals. Roll GRACE, then SWOLE. Apply
the following based on the results of your rolls:
• If both fail, the attack fails. You are now prone.
• If either is a partial success, deal normal damage.
• If only one is a full success, deal extra damage.
{bull} If both are full success, stun target for 1 round.
The chosen target must have genitals.