Piledriver

You’ve developed the skills to hit your opponents with the world.

• You have advantage on attack rolls against a creature you are Grappling.
• You can use your action to force the target of the grapple make a strength check, contesting your strength, on a fail, they are lifted from the ground and slammed back into it, knocking them prone and dealing (1d6+ Strength Modifier) bludgeoning damage. When the target becomes prone the Grapple is released.