One hundred thousand barbarians besieged the city. The city was cut off from food and grass, and traitors secretly poisoned it. Scout Li Pojun was falsely accused of collaborating with the enemy and became a prisoner. Blacksmith Su Zhan risked his life to rescue him and gave him a 'man-killing knife' made of smelted secret iron. Li Pojun broke out of the siege with one sword and broke through three battalions in a row, killing the barbarian vanguard general Hu Yanlie. However, he discovered that behind the siege was a deal between the imperial dignitaries and the barbarian royal court. The old military doctor Zhao Tiegu revealed that the water source was poisoned, the barbarian witch Jiang Xueya struggled between rebellion and loyalty, and the illusion of the general's daughter Duanmuying made the situation even more confusing. Li Pojun and Su Zhan joined forces to fight back in a desperate situation, and discovered a bigger storm-the real target of the barbarians was the ruins of the ancient battlefield underground, where forbidden power that could subvert the two races was sealed.
