Water Slide

You create this veil of water against a flat surface, ranging from 5-50ft, however you would like. Imbedded in the water are thousands of ice shards. The enemy must make a DEX save. On a failed save the target will fall over and travel the entire length of the slide and take 3d8 damage. On a successful save, they will only slide down half the slide and they will take half damage.