Tidal Surge

You conjure up a surge of water that materializes on an area within range. The area can be up to 50 feet long, up to 10 feet wide, and up to 2 feet deep. Each creature in that area must make a Dexterity saving throw. On a failed save, a creature is knocked prone. For the duration, the conjured water surges back and forth turning the area into difficult terrain.