A Mastery of Magic by Evie Wilde

Hidden identities, unexpected enemies, and a mysterious new mentor—all three will test the relationship between me and my men in year three at the Enchanted Academy.

When the academy is attacked by a dangerous chimera and her hoard of minions, it’s time for my men and I to dig deep and up our game with a semester of field training.
I’m having trouble focusing, because I can tell Oliver is keeping something from me.
But my new mentor challenges me to be better. Stronger.
Just when I need the support of everyone in my circle, I discover that someone close to me is not who they appear to be.
Regardless, it’s going to take all of us for me to become the witch I need to be in order to fight a foe whose very existence will be revealed.