Magic Corrupts, Magic Conquers by A J Locke

What if the world changed overnight.and it was all because of you?

All Pennrae wanted to do was to help. Now she's found herself in a world that's been instantaneously transformed by magic.that she brought back. She's gone from a simple karate instructor to an instant celebrity—and she hates it. Fortunately, she has her friends, her beloved magic companion, and one ridiculously hot boyfriend.

But a sudden, unprompted attack in broad daylight is about to make Penn's life even more complicated. An ancient forest guardian known as a Kiabi—a warrior of magic and almost impossible to defeat—has marked Penn to die. The attack at first seems incidental and unprovoked.until she discovers the true cause. Her . Penn may have saved the world, but her actions have set a chain of events in motion. In one brief moment, something dark, terrible, and older than time itself found an opportunity to escape, to free itself from the guardians and mark Pennrae as its enemy. Now the world and everyone she loves face a gruesome fate unless Penn can unleash the full force of her Divine magic...

The Warrior of the Divine Sword series is best enjoyed in order.
Reading Order:
Book #1 Magic Dark, Magic Divine
Book #2 Magic Corrupts, Magic Conquers