Empyrean law mandates that each female child take a test before her fifth birthday.

Those who demonstrate exceptional talent are then able to enter into extensive training, prepping them to join an elite division of the Imperial Guards called the Imperial Princess Garden.

Women of this privileged minority end up not only defending Empyrean from its enemies, but also playing leadership roles in their societies, lending their expertise to all sorts of technology, from instruments of war to vital communication technologies.