Aquaveil

A shimmering shield of water surrounds you, providing additional protection. For the duration of the spell, your base AC becomes 13 + dexterity modifier and you gain advantage on concentration checks. The spell ends if you don armor or if you dismiss the spell as an action. This spell can only be cast if you are emerged in a body of water that is at least 5 feet deep. During the casting time, if you cannot normally breathe underwater, you now can.