Refining the Golden Light Fierce Fire Sword required a total of thirteen types of Five Metals Spirit, and the quantity needed was double that of a normal Tier Three Flying Sword.
The final step of Sword Refinement was tempering it with a True Flame.
A Golden Light Fierce Fire Sword tempered with the Nine Yang True Flame would possess additional killing power against demons and wicked spirits.
The Sword Refining Secret Technique only mentioned the three types of True Flames he had tried. In reality, other True Flames could likely be used for the tempering, but there was no need for risky experiments.
The preliminary work was mostly complete, and since the conditions here were ideal, Bai Zichen decided to refine the sword on the spot.
All the Five Metals Spirit had already been refined once. Nascent Soul Xiaobai breathed out a gout of Pure Yang True Flame, which quickly melted them into a single mass that took the shape of a Flying Sword.
