Bo of Water

You focus the water from the air into a magic quarter staff that has +1 to attacks and damage.  As an action, you can make a single melee weapon attack against a creature with in 30 ft with the bo.

At higher levels: when cast with a spell slot of 4th through 6th, the quarter staff deals additional weapon damage dice (2d8/2d10) and makes the bo a +2 quarterstaff.  When it is cast with a spell slot of 7th level or higher the damage dice increases again (3d8/3d10) and the bo becomes a +3 quarter staff