One of the Song Family's hereditary ultimate techniques, Great Sun Technique.
It was also the most important pillar and foundation supporting the Song Family's thousand-year legacy and ensuring that its influence never waned.
Shenzhou was founded upon martial prowess. Those families possessing hereditary ultimate techniques and secret manuals could seize corresponding benefits amid one dynastic change after another. The more powerful your secret technique was, the higher your cultivation realm, and the greater the achievements of the experts who emerged from your family, the richer the benefits you could obtain.
Any family possessing a starry-sky-level expert would be respected and admired throughout the empire—even across all of Shenzhou. Even the imperial clan would vie to win them over and grant them an appropriate status.
The reason the Chu Clan of the Xifeng Empire had lost control of its power was partly because the Song Family had ceaselessly divided and seized its authority. But it was also because the Chu Family's hereditary ultimate technique, the Demon Slaying Sacred Scroll, had no outstanding descendants capable of comprehending and inheriting it. Thus, the weak grew weaker until the clan was completely controlled by the Song Family. The Chu Clan's members could not even study the complete Demon Slaying Sacred Scroll. The Song Family claimed that the ancient text was too profound and difficult to understand, and not easy to comprehend or learn, so they would manage it on the Chu Clan's behalf. Then they prepared a simplified version of the Demon Slaying Sacred Scroll for the Chu Clan.
In other words, for several centuries, the Demon Slaying Sacred Scroll studied and comprehended by the Chu Clan had been watered down by the Song Family. Some outstanding members of the Chu Clan had tried to demand the original text back from the Song Family