How it the theme of magic introduced in Chapter 2?

Magic will be the means by which Artemis will attempt to gain the gold. He wants to use the fairies' magic against them, so to speak. By learning what he can about their magic, he can neutralize the magic they might use against him, enabling him to better carry out his quest for their gold. Magic will continue to play a large role in the events and outcome of the book. It will be the means by which Artemis tries to gain the gold and how the fairies will try to prevent him from accomplishing his goal.