Douse

You condense water into a small globe that then explodes around you. Creatures in range must make a Dexterity saving throw or have their speed reduced by 5 feet and have disadvantage on attacks of opportunity against you until the start of your next turn. 

This spell's speed reduction increases by 5 feet when you reach 5th level (10 feet), 11th level, (15 feet), and 17th level (20 feet).