After suffering endless hardships in his youth, the blind boy Li Guanqi is taken in by the mysterious elder Su Xuan, who teaches him martial arts, tempers his body, and gifts him a sword casket. At fourteen, he enters the Great Xia Sword Sect and awakens a saint-grade thunder spirit root, outpacing all his peers in cultivation speed. Hidden within his sword casket is a proud sword spirit that secretly guides his training. Venturing into secret realms and leading his allies against formidable foes, Li Guanqi rises through the ranks to forge his own legendary path.