Everything in the world was created from the four elements: Air, Earth, Fire, and Water. The student of the Void, however, knew that all things were all four elements, held together by the intangible Void. The element of Void was that which existed outside of and surrounding the other four elements, defining them in its absence as silence defined the musical note it surrounded. The Ishiken were the students of this, the imperceptible Realm of Void. It was by far the most powerful of the elements, as well as the most difficult to master.