No one understood Suzuka better than Yakushimaru.
It was not because Yakushimaru was Suzuka's father, but because Suzuka's strength, potential, and even the amount of curse power she possessed had all been given to her by Yakushimaru.
Everyone knew that Dairenji Suzuka was a genius known as a "child prodigy." Before she was even old enough to attend the Onmyo Academy, she had already become one of the Twelve Divine Generals and obtained the qualifications of a National First-Class Onmyoji. She possessed more talent for becoming a top Onmyoji than anyone else. However, what the world did not know was that Suzuka's achievements were entirely due to everything Yakushimaru had done to her while he was alive.
When he was alive, Yakushimaru treated Suzuka as an experimental subject for forbidden arts, casting countless forbidden spells on her. That was what caused her curse power to far exceed that of ordinary Onmyoji. Her talent was not something she had possessed innately, but something that had been bestowed upon her later.
Therefore, as the one who had started it all, Yakushimaru could assert that Suzuka had no power capable of standing before him and resisting him.
Yakushimaru had never given Suzuka such potential. Even though everyone believed Suzuka was a child prodigy and a genius among geniuses, Yakushimaru knew that her talent was actually quite illusory. The achievements she had attained were already her limit.
Unless he continued casting new forbidden arts on Suzuka and continued transforming her constitution, Suzuka would never achieve greater growth.
Otherwise, once she separated from Yakushimaru, Suzuka would be unable to continue growing. Taking the lowest position among the Twelve Divine Generals was already her limit.
Who could have imagined that, by sealing Shuten-doji's demon inside her body and becoming a Living Spirit, Suzuka would gain new