Yin and Ning meet Tuoba Yuan and Can Lang during their travels.
They are members of the rebel forces fighting against the Taibai Empire and invite the sisters to join them. They claim it is the duty of one who possesses the tianshu and the Xuan Yuan Sword. Meanwhile, in the Taibai Empire, the recently promoted Zhao struggles with the development of new constructs. In order to give him a chance of pace, the  mpress Long Cheng assigns Zhao to command a unit of constructs and travel the empire. However--
a limitless power source found in an 
ancient Kuican ruin known as black fire.
يستعمل مصدر طاقة لا مُتناهية وُجِدت
في بقايا كيسان تُعرف بالنار السوداء
einer unerschöpflichen Energiequelle,
die man in den antiken Kuican-Ruinen gefunden hat
obtiene su fuente de poder limitada,
conocida como fuego negro,
obtiene su fuerza ilimitada
de una fuente de las ruinas Kuican
utilise la Flamme noire
comme combustible, un pouvoir infini
usa una fonte illimitata di energia 
che è stata scoperta tra le rovine di Kuican
uma fonte de poder sem limites encontrada
nas antigas ruínas Kuican chamada de fogo negro.
будет работать на бесконечном источнике
энергии, найденном в руинах Куйкана.