Cruel Destinies by Tricia Barr

Being the prophesied savior of shifter-kind is a heavy burden, especially when you don’t have a clue how to use your powers.
Arya now knows she’s destined to kill the infamous vampire leader, Hadrian. But how is she supposed to do that when she hasn’t mastered a single one of her shifter abilities? Her schedule is now full of intense training for the fight to come, which is especially daunting when the general of the shifter army is determined to turn her into the ultimate weapon.

Shea continues to play witch-in-the-middle between the sexy gryphon professor and the broody vampire spy. What could go wrong there? Umm, everything!
Tobias knows he can no longer resist his imprint bond with the vexing mermaid—and he doesn’t want to. Struggling to tread lightly the path of an actual romantic relationship proves more difficult than he thought, and he makes a bold move—one that could save them both or end badly for everyone.

Will any of our heroes be able to rise to the occasion of this centuries-long vampire-shifter war, or will their hearts put them in greater danger?