Magic of the Void by Lena Mae Hill

Sagely has no idea that supernatural beings exist, let alone that she’s in danger from a powerful dark warlock. That is, until she’s attacked and mortally wounded. That tips her off pretty quick.
Luckily for her, a sexy warlock from the nearby coven saves her life by transferring some of his magic to her. Not so luckily, the “gifted” magic turns Sagely into a witch herself. The magical powers aren’t bad, and the fact that she gets to choose a collective of supernatural men to protect her has a certain appeal. But being a witch is not all brews and broomsticks. Magic comes with deadly consequences, especially for someone who has just a *bit* of trouble controlling her impulses.
Just when Sagely gets a handle on her magic, the unthinkable happens. The coven discovers the legendary art of void magic locked inside Sagely. And suddenly, every supernatural creature in the world wants a piece of her.