Mira gently laid Dominique down on her bed and sat on the edge, watching the little fox change little by little. The process of merging all aspects of herself didn't happen immediately, and was a slow but gradual process. All the energy in her body, whether it be her own blood, Blood Qi, or soul, had to be converted.
'It's hard to tell if she's getting stronger or not.' Mira thought as she looked away, not concerned about Dominique's strength.
The purpose of the technique wasn't to increase power but potential. It was also a way to save months if not years or centuries of time.
Improving one's Qi was rather easy; just cultivate. But tempering the body and soul isn't quite so straightforward. Most people only pick one, maybe two of the three if they're particularly talented, but even then, the majority of people who do are generally mediocre at both.