Vachedam's Collapse

You raise your hands into the air before quickly bringing them down palms first, and cause a 5ft. x 5ft. pallet of wood or other hard material to appear above a space in range. Any creature in the space takes 3d8 bludgeoning damage and must make a Dexterity Saving Throw, becoming stunned (see the condition) until the start of your next turn on a failure.