After the Lamia had finished what she needed to tell Vicente, he made her do what she had promised.
Under Vicente's close observation, the Lamia let her soul leave her body after giving him the crystal where she could live as long as she didn't have a body to call her own.
Her special powers were very dependent on a physical body, so even though her cultivation and essence wouldn't change in this special form, she wouldn't be able to use almost any of her powers.
In a way, she would be harmless to Vicente or even weaker people, and at most, she could cause trouble with her knowledge and expertise.
Vicente didn't intend to leave her alone with anyone but him, so the chance that she would manipulate anyone, even in such a situation, would be very small.
Onyx and Joshua just watched the whole process while Torne was ready to act and help his master if the Lamia tried anything funny.
