The Reef of Coirnav is but a fraction of the immense Plane of Water, but is the only portion yet to be discovered by the elders in the Plane of Tranquility. It is governed by the Triumvirate of Water, which consists of three gods who represent the three forms of the element. Tarew Marr the Fathom Lord, the father of Mithaniel and Erollisi, represents the liquid state. E'ci, the Wintry Guardian, is the goddess who governs the solid state. And then there is Povar, the Veiled One, who has no physical form and cares not for the affairs of Nature and Influence. None of the members of the Triumvirate of Water can be found in this sector of the Plane of Water. They have enlisted an avatar known as Coirnav to defend their realm from the invading mortals.
The entirety of the reef, save for the small entrance area, is completely underwater. The upper tier consists of a beautiful, sprawling coral reef teeming with exotic fish and other vibrant, aquatic life. Beneath this tier is a vast ocean where a tribe of fishmen called the Hraquis live, ruled by a great shaman chieftain known as Ofossaa the Enlightened. They protect this area along with a race of crustacean men called Regrua, who are led by a massive beast named Krziik the Mighty. In an almost hidden cove near the darkest depths of the realm is a fierce kraken named Hydrotha. Then, approaching the avatar's dwelling, there are the Triloun, a race of ancient mephits that wield immense power over the element of water. They are led by Grioihon the Wise, whose age and knowledge is immeasurable. And finally is Coirnav, the Avatar of Water itself. Coirnav was created by the Triumvirate using a piece of each of their essences and divine powers. Over time he has developed special powers based on all three forms of the element. It is now that the Triumvirate has chosen to deploy their creation, for now it is of the utmost importance to stop the mortal's raid upon the Planes of Power.