From the introduction: Throughout the multiverse exists an absolutely countless number of species and existences, arising from natural forces, the clashing of metaphysical energies, Heavenly Laws guiding evolution, and more. The higher up amongst the Realms one goes, the stranger and more primal the species become-devolving to pure and primal Elementals, Spirits, and Automata whose sheer density of power can rival Deities. In the Mortal Realm however, the vast majority of species tend to be Complete existences-possessing the elements of Mind, Body, and Soul. These Complete existences serve as the foundation and population of the entire multiverse, spread out amongst the countless universes in one form or another.