From audible.com:
From the international best-selling author of the Broken Empire Trilogy comes the first in a brilliant new breakout fantasy series. A searing novel set in a brand-new world, this series follows a young girl who enters a convent where girls are selected to train in religion, combat, or magic. Nona is selected to learn combat and finds herself at the center of an epic battle for empire on the outer reaches of a dying universe.