Lang Son Giant City was the giant city in northeastern Vietnam Region closest to China's border. Its resident population exceeded one hundred million, with over a million people passing through daily. It was the highest-ranked, largest, and most prosperous city across hundreds of thousands of miles in northeastern Yue State.
Before the National War erupted, Lang Son Giant City had fallen under the command of Mountain-Moving King, one of the Five Beast Kings. Its territory contained vast virgin forests and towering mountain ranges, producing all manner of exotic beasts, especially avian ones. Veins of gold, silver, copper, iron, Spirit Stone, and other minerals crisscrossed the land in abundance, making it a vital resource base for Yue State.
When Mountain-Moving King marched north with the army to conquer China, the deputy city lord, "Heavenly-Eye General," who had fused with the soul-blood of the Heavenly-Eye Divine Ox, temporarily assumed the role of city lord. He possessed ninth-grade Beast General cultivation. The other Beast Generals had followed the northern expedition, and ninety percent of the city's forces had been transferred away, leaving only a hundred thousand or so Yue soldiers barely able to keep the territory from descending into chaos. They had already struggled to suppress the city's civilians and bandits. Then news of the Sino-Vietnam Decisive Battle's end arrived. Coupled with the Huan King's furious march for vengeance, it was like a thunderbolt exploding beneath clear skies throughout Yue State.
By evening, word arrived that the saintess, who had led a million kind citizens to beg the Huan King for mercy, had been cold-bloodedly slaughtered. Together with the Huan King's proclamation, Lang Son Giant City was thrown completely into turmoil. Refugees surged in number, while the city's officials and generals bickered into a chaotic mess. Some advocated surrender, some advocated battle, while