Indeed, the biggest gain from this trip to Coiling Dragon Star belonged to Fang Han - with the Heavenly Dragon Skeleton, Blood Dragon Crystal Mountain, Dragon God Pill and eight supreme treasures - not to mention the fact that he managed to cultivate the Great Devouring Technique and subjugate the "Black Abyss King" - these were monumental achievements.
The Black Abyss King was a powerhouse with the Ninth Level of Divine Power Realm, a Heavenly and Earthly Dharmas phenomenon level. This status was much more exalted than the Golden Core Big Shots of the Seventh Level of Divine Power Realm, thus enlisting it would be of great advantage. Moreover, Fang Han planted a talisman composed of Avici Demon Qi in its Dark Primordial Spirit. He did not fear it rebelling - if it did, it would die instantly.
Fang Han stayed out of the conflict between the Underground Demonic Race and the Great Xuan Empire.
