Heavenly dao was the law of heaven, which could also be seen as the heavenly rules and restrictions.

Wu Yu was the heaven within his Devouring Apotheosis Realm. He was the will of the whole apotheosis realm.

He currently had many immortals in his Devouring Apotheosis Realm, but it would not be so easy for them to progress past ordinary immortalhood.

He had to make the Sea of Heavenly Dao in order for them to continue progress.

This was a fairly difficult process. Luckily, Wu Yu devouring many eternal demon emperor corpses had given him some knowledge...