Weapon of Fire and Ash series by Brittany Matsen
The Mark of Fallen Flame - Book 1 Blurb
The balance between good and evil comes down to one girl.
But is the darkness really so bad?
Emma Duvall starts senior year with one thing in mind: make Seattle, home.
All her life her mother lived with one foot out the door, but no more. That is, until Emma discovers she has the power to turn terrifying creatures of the night to ash with a single touch. That one moment unveils a hidden world of supernatural beings, both good and bad.
Suddenly her best friend is acting strange, the new guy that's mysteriously in every one of her classes is too beautiful to be human, and an ancient, powerful being is stalking her.
To top it off, the "good guys", the Giborim, aren't convinced that Emma can be trusted. But their unofficial leader, Blaze, becomes her unwilling protector--and perhaps something more--setting fire to millennia of hard-set prejudices.
Especially when her newfound power awakens a deep and dark hunger that can only be sated with death.