The dragon heir.
(Young Adult Book)

"The covenant that was meant to keep the wizard wars at bay has been stolen, and Trinity must prepare for attack. When Jason Haley finds a powerful talisman --a huge opal called the Dragonheart--buried in a cave, his role takes on new importance. The stone seems to sing to Jason's very soulMadison Moss can feel the beating heart of the opal, too. Moral compasses spin out of control as a final battle storms through what was once a sanctuary for the gifted. With so much to lose, what will Jason and Maddie be willing to fight for -- and what will they sacrifice? "--Publisher description.