Tsunami

You create a massive wave of water that then moves in a straight line across land at a speed of 50 feet per round. Creatures struck by a tsunami take 24d6 points of bludgeoning damage (a Fortitude save halves this damage). In addition, every creature must succeed on a combat maneuver check, Athletics check, or Mobility check against the DC of this spell or be knocked prone and carried along by the wave. Freedom of movement prevents a creature from being carried along by a tsunami but does not prevent damage caused by it hitting a creature.