Last time when he refined demons at Gupo Ridge, he had thought about using Heavenly Fire to supplement the Purple And Blue Divine Flames, but he had no opportunity to undergo a tribulation at the moment.
The Taiyin Hunyuan Ancestor sought him out to refine the Sky Demon Exterminating Immortal Slaying Sword, yet he didn't actually have much desire for the sword itself, for even if it was successfully refined, it would ultimately be given to the Nine Child Mother Sky Demon.
If the Heavenly Tribulation and Human Tribulation failed to forge the Immortal Slaying Sword, it wouldn't mean much to him.
What he really wanted were first, the "Nine Heavens Mysterious Scripture," and second, the Purple and Blue Duoluo Fire.
Rain that has not fallen to the ground from the heavens becomes rootless water, and fire that descends from the sky without touching the ground, without being condensed and refined by human hands and tainted with impurities, is known as rootless fire.
