The Muramite Proving Grounds are a zone introduced in Omens of War. Inside are the Muramite Proving Grounds Trials. The Projections of Arcana, Body, Mind, Power, Realms, and Tactics each offer a group trial and raid trial. Take them up on their offers, and be tested in small instanced zones for great rewards. The raid trials are each part of the Citadel of Anguish access quest.