Before the dragon clan rose to power and populated the Heavenly Realm, they used to rule over the seas in the Human Realm.
After the first Heavenly Emperor ascended to the Dragon Throne, he thought about the old seat that he left behind.
To keep the four seas in check, the Heavenly Emperor thus appointed the Four Sea Kings who then ruled over the four seas in the Human Realm.
There was a precious cultivation spot in a cave where the eastern and western currents met. It was brimming with ancient spiritual power that only the strongest of the strongest members of the dragon clan could hope to harvest.
Locked inside said cave for three days and three nights, the Crown Prince of the Heavenly Realm Xie Jianyu was meditating in all seriousness.
Xie Jianyu sat in the lotus position and did some breathing exercises.