Water elemental cohorts are small creatures hailing directly from the Elemental Plane of Water. What they lack in physical prowess, they make up for in potential, being quick learners and capable of gaining the ability to cast cantrips. Aquamancers from throughout the planes enlist their services, though it could be said that the elementals are the ones doing the enlisting. Elemental Nature. A water elemental cohort doesn't require air, food, drink, or sleep.