Ken En Ken: Aoki Kagayaki S01E03 - The Sword of Sorrow

The girl that appeared out of the tianshu bamboo writing strip is Yun, a doll made using Mujia. Yun calls the sword that appeared out of the tianshu the legendary Xuan Yuan Sword. Through Yun, Yin and Ning acquire new power. Meanwhile, with a single word from Empress Cheng, Zhao is made chief engineer. He now works on developing constructs. Mo Heng, who betrayed the empire and joined the rebel army, is also working on a new weapon he calls black fire armor.