Suiyan
Theory time: the end would consist of all realms joining into 1 realm, and they used to all be one realm Also we still havent met any of the creatures that made the realms. We know atleast the kun realm isn't natural because of one of the creators bodies in the godly path realm. My theory is only the kun realm is artificial, a noahs arc. Thats why it has so many races and some of the races seem to be good at particular things. It was made to host creatures of all the realms when they starting splitting with some races being for specific jobs.
Kun Realm was created for a reason it will be revealed once the creators enters the story. The Mong Realms et.al doesn’t even know their existence (probably). Such a shame Luvile and Hishe died but I know Krune will revive them coz beyond the Kun Realms lies the world of Primordial wherein Luvile and his wife goal is to search way to revive their son