Perhaps it was because the core of the current age, the Sun and the East Sea, came into contact, which caused a brief disturbance at the level of the world, thereby attracting some things that should not have appeared.
After all, a complete ocean and water are forces on par with The Sky, if their authority had not been divided, perhaps the ancient Sea God would have already reached the great realms. The Sun, albeit slightly inferior, might also have reached greatness at the end of the third era if not for the divided power.
From this perspective, perhaps all of this is a part of the "destined" cycle of the present age. Such potentially great divine authorities, He had divided them up long ago one by one.
The most recent one was Meteorology, and the next, most likely, will be Light.
