Falling Slash

You can attack during a downward jump, adding an extra 1d4 damage for every 5 feet you fall. Upon impact, you can choose to roll to your feet and ready yourself. Roll Athletics, you must beat a 10 plus 1 for every 5 feet you have fallen.

Example

You leap from a balcony, falling 15 feet to deal 1d6+3d4 slashing damage upon your foe. Rolling Athletics, you must beat a DC13 to tumble and get to your feet in one swift motion. Upon failing, you take half falling damage.