Its body broke free from the control of will, and instead, the operation of energy within was replaced by the complete system grown from the Blood Lotus Seed.
It's not that the Zombie Ancestor Demon Bat Cain couldn't be directly exterminated, but this demon was crucial to the existence of the Blood Warrior System. Killing it was easy, but how to control the system afterward was still a problem. Zheng Yi hadn't thought of a good solution yet, so he temporarily decided to control the demon's body.
Using the technique of controlling living corpses, he managed the body and energy operation of the Zombie Ancestor Demon Bat Cain, keeping it active and turning it into a kind of living puppet.
As for the Zombie Ancestor Demon Bat Cain, it wasn't entirely destroyed in will; it was merely sealed by Zheng Yi.
