Subrealms are the second breakdown from the Three Realms. Namely, when you take some qualities from each of the three and focus them with a concept, a Subrealm is born. It has been the subject of philosophical debate whether writers tapping into the Second and Third Realms truly create or merely "discover" Subrealms when engaging in creativity or expression. Subrealms, confusingly, are not so much worlds themselves but a layer of concept that defines a world and allows it to be. For example, a planet such as Earth without Ningenkai as a Subrealm might be considered little more than a vagrant space rock.