Xu Yan listened to the explanation from Netherworld and suddenly realized the original definition of Master of Domain, which came to be like this. By now, the Minor Heaven and Earth Master, also known as the Realm Master.
However, to differentiate, those who had now established a Minor Heaven and Earth were called Minor Heaven and Earth Masters, while those who had not established a Domain, yet had attained this level of strength and reached this realm, were called Realm Masters.
Imperishable Temple had no Minor Heaven and Earth Masters, only Realm Master Level powerhouses, because in the Imperishable Temple, none had established a Minor Heaven and Earth.
"The Minor Heaven and Earth Master himself is still a Principle; the Heaven and Earth Laws are subsumed into one's being, and when the Principles nearly transform into Dao Principles, one becomes the pinnacle strong among Minor Heaven and Earth Masters.