Within The Essence - The Division, #1

As the demons near, the Essences rise.AJ had never been particularly athletic or coordinated, so waking up to realize she suddenly has super-human strength is a massive, mind-shaking shock. Finding that she's gained a stalker overnight is another mark in the unusual category, and when she discovers she's always had the essence of a werewolf in her blood, her world all but shifts beneath her. Demons, she's told, are looming in the world's future, and the only hope humanity has of surviving their arrival is if she and teenagers like her surrender their humanity to dive into their mythical essences.
Fairies, dragons, dwarves, mermaids. The remnants of seventeen different fantasy species must come to life to save the lives of everyone. Someway, an army of supernatural teenagers must prepare to meet the demons escaping from their dimensional banishment, or everything ends. Can these teens succeed and save the world?