With the cultivation of the Red Flame Sword Jue reaching this point, it was possible to sublimate the Green Flames Sword Slaughter into a move called "Flame Sun Slash," touted to be able to fuse together all tangible matter, invincible against all.
Above the Flame Sun Slash was the "Extreme Sun Slash," the power of Rank-4, proclaimed to cut through anything and everything.
If one could master the Extreme Sun Slash, then it meant the Red Flame Sword Jue had been cultivated to its limit, and one could also draw that Rank-4 "Great Sun Sword Talisman".
The sight of Chen Mobai using Pure Yang Fire to melt the Ghost Cultivator indeed bore a striking resemblance to the Golden Flame, therefore, it was no wonder that Fu Zongjue had been mistaken.
"Is this a branch technique of the Burning Heaven Purifying World Fire?"
At this moment, the Underworld official also retrieved from his ancient memories an image similar to the Pure Yang Fire.