The Priest Order Hall, Netherlight Temple, is located on the world of Niskara, a planet that is controlled by the Burning Legion. Priests will discover the Temple via a portal in New Dalaran while on their quest to acquire their Artifact weapon. There are three wings within the Temple, one for each specialization of the Priest class. A variety of Priests can be seen wandering the halls, including Crimson Priests and Anchorites. As a Priest, you will be able to return to your Hall via a portal in Dalaran.
Here is a preview, featuring some of the highlights of this upcoming feature. Loremaster Lycan shares some history of the Priest class and the Draenai race. Enjoy!