As discussed prior, the energy of the multiverse can be divided into four quadrants. Each quadrant has its own mechanics associated with it, including a solid form of that energy. These solids are known as fundamental substances, for it is from them that the worlds are made.

Chaotic-Darkness: Mordite

Unlike other forms of chaotic-dark essence, mordite does not destroy things it comes in contact with. Under most circumstances, it is inert. It can even be alloyed with other materials.This does not mean it is not dangerous, however; in fact, due to one simple property, mordite is perhaps the most dangerous thing in all of existence. This property of mordite is its ability to kill anything. No being is safe; not humans, not robots, not gods. Even the Witherlord could be slain with a mordite blade (that is, barring his ability to simply control any mordite that might be wielded against him). Just because a mordite blade can kill doesn't mean it always will - a glancing blow, one that does not strike the core of a being, will only gravely wound. But it will wound, resisting whatever magical healing factor the creature might have.

Ordered-Darkness: Nullite

Not much is known about the nullite: it is only the ennullers that have access to it, and they are notoriously secretive. Nullite is used to power the magic system of Silence, including the barriers that keep the most powerful entities in the universe trapped. 

Chaotic-Light: Prismite (commonly known as Narrativium)

Prismite is by far the most common of the fundamental substances, especially within the confines of the Wall. Pieces of it are known as dream crystals and are used by various dream artists as a source of power for innumerable magic systems. Dream crystals are also used by dyrlings in a similar fashion to power their wild magic.

Prismite is the substance that forms the matter of the world. Each dream crystal contains within it its own world, known as a dreamscape. Dream artists manipulate this dreamscape- consciously or unconsciously - and then project it onto the prismite of reality. The most powerful examples of this are the Narrators, who dictate whatever they desire.

Ordered-Light: Luxite

Luxite has been almost completely eradicated from reality in the present day. It specializes in the manipulation and the control of energy. Its best-known use is as a weapon against chaotic-dark entities, but it is also critical in maintaining the structure of the universe. Luxite forms the foundation upon which everything else is built, and without it all of reality would be subject to the ravages of the Void.