You gain the ability to subtly control the water around you.
If it is raining, you can use an action to cause the rain to stop falling in a 6-meters-radius cylinder centered on you. You can end this effect as a bonus action.
If there is water nearby, you can use a bonus action each round to cause the water to flow up to 25 meters in a certain direction in a 30-meters-radius sphere centered on you. The water flows in that direction until the end of your next turn.