The Cangxuan Continent was once unified by the Tianyuan Dynasty, but due to the power of taboos, it split into two regions: the east and the west. The royal family of the Dajing Dynasty in the Eastern Region controls the orthodoxy of dragon energy, but due to intermarriage, the dragon energy has declined and relies on aristocratic families for checks and balances. The Alliance of Ten Thousand Races in the Western Region is composed of expelled monsters, barbarians and defected monks. They believe in the power of blood and covet the fertile soil of the Eastern Region. Legend has it that the Tianyuan Secret Treasury deep in the mainland contains the method of recasting the dragon's veins, which requires the three keys of dragon energy, blood, and soul, triggering a thousand-year struggle.
Dajing deposed the crown prince Xiao Che, and his mother-in-law was a holy girl from the Fox Clan in the Western Regions. Ye Lingshuang, the young leader of the Falcon Tribe of the Alliance of Ten Thousand Races, whose father was betrayed by his cronies and died in battle, changed his name to Lingshuang and sneaked into the capital of Dajing to become the master of the Shadow Pavilion. The two were forced to join forces because they were jointly hunted by the Dajing family, and sneaked into the royal ancestral mausoleum to discover clues to the secret vault. The mural reveals that the Tianyuan Dynasty was actually fighting each other over the secret treasury, and that the so-called taboos were just lies from the victors. Ye Lingshuang also intercepted the secret agreement between the family and the traitors in the Western Regions, and realized that the careerists were the real enemies. Carrying racial hatred and royal grievances, the two men, along with frontier veterans and followers of the Alliance's peace faction, are hunting for the third soul key. After witnessing the cruelty of war from the bones of the ashes, they put aside their differences and agreed to end the war first. Finally, at Broken Dragon Cliff, Xiao Che activated the Dragon Qi Key with his half-dragon and half-fox bloodline, and Ye Lingshuang awakened the Bloodline Key with his falcon bloodline, and together they drew out the remnant soul of Emperor Tianyuan. The truth about the secret vault shocks the world: it is not a tool for recasting dragon veins, but a contract of symbiotic power that records the peaceful coexistence of all races. The two mobilized the power of symbiosis to defeat the careerists, signed the Cangxuan Peace Treaty, established a parliament of all ethnic groups, and finally let the flower of peace bloom on the ashes.