"The reason has come out," Ma Shuai found Gu Tao. "He practiced a secret technique."
"Secret technique? The kind practiced by Xiuling?"
"Who is Xiuling?"
Gu Tao slapped his forehead, recalling that Ma Shuai didn't know Xiuling. He had intended to introduce, but then thought it unnecessary, since Xiuling was nominally dead. His past had turned to dust, to dust return, to earth return, so he simply introduced the situation, saying the practice of the secret technique caused irreversible bodily changes.
"Ah, secret techniques have this characteristic. They are designed for training demon spirits, and there is a fundamental difference between humans and demons. Many things must be modified before they can be used." Ma Shuai nodded and said, "This teacher who lost control of his superpowers indeed practiced a secret technique, but I can confirm it's neither from the Mountain and Sea Realm nor from the Kunlun, but rather it's a Western secret technique."