You have learned your way of fighting trough watching the watter. You gain the following Abillity's:

• turn the battle: just like ebb and flood the battlefield will change.

  As a bonus action you coat your blade in a flowing wave of water granting you an additional 1 cold damage equal to the amount of enemies on the battlefield.( If there is only one enemy but a strong one it's a d4) on your next successful melee attack.

•  clashing wave: all waves end eventually.

  If you get an attack of opportunity on a creature you can forgo the damage in turn to force the creature that is moving past you to a standstill if succeeding a strength save equal to its AC.

• waterfowl dance: As swift as the waves.

   As a bonus action The user jumps in the air and dives onto a target in a 30ft area, Slashing multiple times in quick succession in a 10ft sphere. Every creature  in range must make a dexterity saving throw equal to your DC (8+weapon modifier+proficiency modifier) if failed they take 4 attacks from the melee weapon you're using.

  After using this technique your body becomes exhausted and enemies have advantage on attacks against you.

Passive ability: continues flow:

 be one with the water. When you dash you can run 30 feet on water before falling in the water.