The Burning Heaven Sword was a secret technique that even the elders of the various sects of the Longevity Sect did not know. Only the disciples of Mount Li could possibly access it, but Chen Changsheng had never been to Mount Li in his entire life, so how had he learned it? To normal people, this was a most incomprehensible problem, perhaps a riddle that would torment them for the rest of their lives. However, the powerful figures within the Hall of Shining Words knew of more stories than normal people, stories that took place much longer ago. It didn't take long for them to remember that several centuries ago, a certain incident took place in the war against the demons. Against the backdrop of the momentous battlefield, this incident was quite unremarkable, but its effects were incredibly long-lasting.
After that incident, the secret manual of the Mount Li Sword Style was sent to White Emperor City.