Mountain Collapse - S1.E11

The Wen sect start to attack the Lotus Pier and its shield formation. The barrier is brought down when Wen Zhuliu kills the Jiang maintaining it and the Wen unleash a barrage of flame arrows that set fire to the Lotus Pier before invading. Yu Ziyuan leads her sons into battle. However, the fight is too huge to handle and Madame Yu decides to put Wei Wuxian and Jiang Cheng on a boat to safety. She and Jiang Cheng share a tearful goodbye and Yu Ziyuan hands over Zidian to Jiang Cheng. Wei Wuxian is made to promise he will protect Jiang Cheng with his life and the two leave against their will, paralyzed by Zidian and taken away by the currents. They spot Jiang Fengmian on his way back to Yunmeng and Jiang Cheng fears for his safety. By the time they manage to return the place is in ruins. Over 1500 disciplines and cultivators of the sect are dead. When they see their parents dead near Wen Chao, Jiang Cheng acts on impulse and catches the attention of Wen Zhuliu.