In a preface I guess you could call it. It was in Ring of Solomon and it was stated that magicians had no powers of their own except to call and restrain spirits. But numerous examples are given throughout the books that says otherwise.
In book one, it was said that Jessica Whitwell conjured a void with minimal loss of life when Czech spies set a Marid on her, then it also shows her throwing a fireball at Lovelace when he attempted a coup.
In second book, it gives examples of this as well. It summarizes the two year time gap between the books. It also says that Nathaniel learned how to weave Sensory Webs to stop spying and to conjure rapid Fluxes to carry away hostile magic.
So what exactly is the verdict with this?