Mantle of Water

The ruler of the plane of water, currently a fish.

Observance

Druids, monks, and dragonborn who observe the elemental powers will often perform minor rituals to each element in places of 'significance'.  Sometimes these places just appear to honor their elements (waterfalls, massive gorges, lightning storms) and other times these locations might actually lead to the elemental planes.  In either case simple pouring of water, or swimming can go a long way.