Darya's Wave Transport

You conjure a magical wave of water to surf across the battlefield and trip up your enemies.  For the duration, your speed increased by 20 ft, and moving doesn't provoke opportunity attacks.  Additionally, when you leave a space within 5 ft of a creature, you can force the creature to make a strength saving throw.  on a failed save, the creature is knocked prone.  A creature can only be affected by the water once each turn.