The Five Elements Immortal Mansion is of the former, an heirloom from a Heavenly Immortal from the Upper Realm. For some reason, it ended up in the mortal world and was ultimately obtained by Feng Chaoyang, the Five Elements Saint Son.
Not only did Feng Chaoyang acquire the Five Elements Immortal Mansion and the Five Elements Immortal Root, but he also inherited the Heavenly Immortal's cultivation techniques.
According to the celestial ranking system of the Upper Realm, those who have passed the Ninefold Celestial Tribulation are considered Human Immortals, who are ranked at the ninth order.
Above Human Immortals are Earth Immortals, who are ranked at the tenth order.
Above Earth Immortals are Heavenly Immortals, who are of the eleventh tier.
Heavenly Immortals, even in the Upper Realm, are powerful beings. The ancestor of the Five Elements Immortal Sect is such a cultivator.
The significance of a Heavenly Immortal can thus be seen!