It wasn't just her cultivation that was being taken, but she was going to lose even more.
She didn't know how long it took, but by the time she was done, Diamond had lost all her cultivation. She felt very weak, and was back to being a normal human being. She felt very pathetic t losing such a power, but when she realized that she had finally acquired metaphysics power and could actually fortune tell without any error, all that pain vanished.
Anyway, forwarding the time line.
Using the new skills that were much more powerful than the prediction skill, Diamond finally realized that what she was dealing with wasn't easy. No wonder why they couldn't find the book no matter how much they tried.
In order to locate the book of death, another sacrifice had to be made, and this time, it was her lifespan.
It was simply ridiculous, and this time, Diamond didn't want to do it.
