When Daenerys hatched three dragons from what seemed to be petrified eggs during the finale of Game of Thrones' first season, the balance of power between the contenders for the Iron Throne began to shift. Thanks to her ever-growing, ever-more powerful "children," Daenerys has transformed from one of the show's underdogs to arguably its most powerful political player. Which raises a question: How could any army in Westeros take on the returning Targaryen and her forces? How could anyone kill one of Daenerys' dragons?