The name of this skill is a reference to Dwayna, the goddess of life and air.
With one enchantment or hex on your target, Dwayna's Kiss will outheal Orison of Healing. With a total of four enchantments or hexes on your target, Dwayna's Kiss will outheal Heal Other.
This is an extremely powerful healing skill for only 5 Energy. Heals of 300 or more are not unheard of.