Water Dragon

As you let the drop of water fall a giant water dragon erupts forwards swallowing your enemies and all unlucky to pass. It goes 150 feet straight and in a 7ft cone. It extinguishes all non-magical fires and magical fires below this spell’s level. 

Those in line with this spell must make a dexterity saving though or suffer 10d8 bludgening damage. On a successful save you take half. If you are on the edge of the water dragon, the save remains dexterity, but if you pass, you take no damage, and if you fail you take half.