She wasn't using it for a month and was afraid she wouldn't be used to it.

After this research, she suddenly discovered that her body had turned into a top-grade spiritual root, and her spiritual veins had also widened a lot. Now she is simply a cultivation genius.

She was busy with other things and didn't notice it.

She looked again to confirm that she was not mistaken, and woke Xuanyuan Tunhan up in surprise: "Grandfather, why has my physique changed? Is this still my body?"

Xuanyuan Tunhan glanced at her lazily: "What do you think?"

Ning Xianyu confirmed that this was her body and quickly asked, "Then how did you help me change my physique?"

Xuanyuan Tunhan said impatiently, "Extremely cold spring water."

The system suddenly realized: [I remember now. Extremely cold spring water can refine one's constitution, and even mixed spiritual roots can be transformed into supreme spiritual roots.]

[However, the tempering process is very painful, and the whole process is worse than death. It is like cutting a person open piece by piece, reassembling the bones and flesh, and then cutting them open again, over and over again.]

She suddenly remembered the dirty water in the cauldron: [That dirty water must be the impurities extracted from your body. It must have taken a long time to refine it so thoroughly.]

Ning Xianyu was stunned.

So, the big devil has been tempering her body for the past half month, and he has been tortured while she was sleeping?

He had refined her body to such a pure state and had also forcibly raised her cultivation level, so naturally he wouldn't kill her easily, otherwise his efforts would be in vain.

But why is this?