Ember - Tess Williams

Evelyn is one girl amidst hundreds of sword wielding, demon fighting, magic casting. boys.
Insecurity and logic have always kept the wild, adventurous spirit of seventeen year old Evelyn Avest stuck in her home town of Tiver. Now, with the Order, an all male fighting league, she finally feels like she's found her place. If she wants to stay she'll have to prove her worth as a magic Artisan. The problem is, the only one who can teach her to do that is one particularly infuriating, exasperating, cocky, self absorbed, gorgeous, powerful, hot, well. Jerk. A war is coming, and in the end, the girl who should not be there. will become the only answer.