Immortal vampires wouldn't kill all the human beings. They would try to tame some human saints as well.
If a human saint surrendered to the immortal vampires, yet the human beings didn't know, then that human saint was of great value to the immortal vampires.
Zhu Qingyi wanted to change Zhang Ruochen's allegiance.
Zhang Ruochen couldn't tell Zhu Qingyi's cultivation. He only knew that Zhu Qingyi was extremely powerful, perhaps stronger than the Immortal Goddess, Ying Huo.
"Make a full-strength strike and retreat to the north."
Zhang Ruochen transmitted his voice to Huang Yanchen and Qing Mo. He let out his mind power and condensed 'Thunder God Hammer.' They tried to attack the three great beings led by Zhu Qingyi.
Meanwhile, Huang Yanchen wielded her divine sword, forming thousands of traces of sword Qi, which made a sword river, making a cracking sound. There were sword traces everywhere on the ground.