Battle Mage3 books in series
Battle Mage 1 Publisher's Summary
Stealing from a mage was both the best and worst thing I had ever done.
After being caught, I was named a criminal and sent to a prison known as the Jade Bastion. Located at the Edge of the World, this prison carries a secret. Those inmates who have magical abilities are trained in the most powerful magic known to the empire: battle magic.
To survive, I will need to discover a secret I didn't know I possessed. I can become more powerful through bonding with the other beautiful, magically inclined inmates.
This will be my greatest trial yet, but if I can grow stronger, I might just survive it and become a Battle Mage.