The Gathering (Hunters of the Dream, #1)

When the summer holidays begin, Aurora thinks she’s just a normal teenager about to have another boring summer. Then, for her seventeenth birthday, Nana Brin gives her a long-silent Oracle that has been passed down through their family for generations. The mysterious Oracle soon awakens in response to the creeping Darkness that is escaping and destroying all worlds. Aurora must quickly find the courage to come to terms with her calling as the Huntress of the Dream.
As she is initiated into a world of deep magic, energy healing, and alternate universes she finds her fellow hunters and allies. They include, Ash and Wolf, who have been sent to protect her; Beaumont Sebring, a seasoned time traveller; Vaadin, an ancient Shaman with amnesia; Ronan Havelock, the shapeshifting Selkie who doesn’t understand that he is no longer human; Eirwen, the mischievous Nature Fairy; and Nana Brin, Aurora’s grandmother, who isn’t exactly who she appears to be.