I'm once again looking for a story i read years ago, it was an unfinished collaboration by two authors. The story is about a young man in australia who finds out he is the son of an angel and a human. he has powers, and almost kills a bully at his school when they awaken. later in the story a girl joins him as his guardian/mate? i'm not sure on that point, but she's given training and at the end she gets a special pair of knives that contain cherub souls... aside from different creatures attacking them, that's about all i remember. Any help would be great. Thanks!