The Shadow Tribe: Book 1 (Parts 1-3 of the Shadow Tribe Series) by Jaffrey Clark

In the desert-city of Terron lives an orphan boy, named Joby. With a magical staff and a fast hand, he roams the streets with his only friend, a stray dog named, Scratch. The mystery of his past is complicated by the secret of his present: he is invisible to the world of men.

One night while visiting his usual haunts, Joby crosses paths with a dark sorcerer named Abigor. The encounter awakens a magic in him that he has never before experienced. That is just the beginning. While trying to learn more about Abigor and the connection between them, Joby discovers he is not the only magical orphan in Terron.