In the spring of the second year of Xiangxing, the exiled court of the Southern Song Dynasty was trapped in Yashan. The anti-Yuan general Lu Huaizhou and the blind girl Zhao Qingwu, whose life experience is a mystery, discover the traditional jade seal hidden in the "Huayi Map" at the bottom of the Qiantang River. This picture shows the mountains and rivers when exposed to blood, and the military deployment when encountering salt precipitation, which coincides with the offensive route of the Mongolian navy. The two of them followed the Song Dynasty gate foundations, sunken ships and firearms wreckage left behind by the Caobang, and uncovered a conspiracy that Han Ping, the Privy Councilor of the shogunate, had carefully planned for twenty years. This powerful minister with a Manichaean flame tattooed behind his ear actually used the gunpowder formula from the "Wu Jing Zong Yao" and Persian iron smelting technology to transform the Song Dynasty's armored stomachs and warships into weapons to massacre the Han army.
As the list of soldiers and civilians for the Changzhou massacre, the method for purifying Yangzhou fierce fire oil, and the recipe for Fujian poisonous fire caltrops came to light one after another, Lu and Zhao gradually came into contact with the shocking truth: Han Ping used Wen Tianxiang's "Song of Righteousness" as bait to hide the Ba Si Ba text in the young emperor's dragon boat, hoping to use the Yashan naval battle to refine 100,000 Song troops into "humanoid firearms." On the night of the final battle, among the coral reefs stacked with shipwrecks, the cast-iron thunderbolts sprayed out a hailstorm of fire soaked in aconitum poison. When the imperial seal cracked into twelve petals and sank into the South China Sea, Lu Huaizhou's Liquan gun and Zhao Qingwu's Hetu soft sword spelled out the fragments of "Jue Jiang Yue" lost during Deyou's reign on the gilded lines of the Dragon Guard's heavy armor - it turned out to be Lu Xiufu before he threw the young emperor into the sea...
