Ring of Divine Nature – Water

Once per day, as an action, the wearer can issue a
command causing a protective magical force to
surround you, manifesting as a spectral frost
that covers you and your gear. You gain 5
temporary hit points for the duration. If a
creature hits you with a melee attack while you
have these hit points, the creature takes 5
cold damage.
This effect ends when the temporary hit points
gained from the ring are lost or after one hour.
Its power recharges at the end of a long rest.