Physical weakness was not the stated requirement so I didn't give one
All her weakness are social or personal
In Buddhism, void does not imply something lacking, but rather the elimination of what is superfluous.
In the void is virtue, and no evil. Wisdom exists, principle exists, the way exists. Spirit is Void.
The hyoho of the body and the massive rock are both shown in Ku (emptiness). Musashi says to make your emptiness your way, and your way your emptiness. The word Ku is entirely good and contains no evil.
However, the mind presented in Gorin no Sho is the spiritual mind which frees itself from ego. Musashi called this the hyoho of Jisso-enmon (the ultimate reality and perfection), in which one receives peacefully, thankfully, everything in the world for what it is, good or bad, for the benefit of oneself and others.
By meditating on the Void Sunōrirī becomes empty and unaffected by most if not all magic that tries to directly affect her
It's the only mystical thing she does
If the Void is too powerful (empty) I will replace it with "The Book of Earth"
The Earth book, according to Go Rin No Sho, is mentioned as the book that refers expressly to the strategy taught by Musashi at the Ichi School, and it is said to be how to distinguish the way through "Sword-Fencing", or "Swordsmanship". The idea of strategy would be encouraged to be very astute in their study and strategy:
Of course that sounds a bit OP to me because it would double her ability with weapons and attack
Sunōrirī is a follower of The Book of Five Rings (Go Rin No Sho) and has studied all five books