In the last peaceful days of the Northern Song dynasty, Xiang Xian, deputy chief of the Song Department of Exorcism, is tasked with finding a box containing Heaven’s Will. Along the way, he crosses paths—and blades—with stern and unyielding fellow exorcist Xiao Kun. When the two witness a prophecy that a calamity will soon befall the world, they reluctantly agree to work together to find the heart lamp, revitalize the Department of Exorcism, and avert the impending catastrophe.