Tales From Utherion: Heavens Stone by Victoria Rabould
When Rowan and Alder save a royal party from sure demise, they hardly know they are putting themselves on a path that will change their lives forever. Pulled into a quest that, if failed, will result in the destruction of their kingdom and the world, they set out to find the Stone of Heaven, a mythical stone that gives the user the power of creation. Enemies, spies, and dark magic are on all sides. Creatures that had only been heard about in children's tales now hunt Rowan and Alder at every turn. Will Rowan and Alder find the stone and save the kingdom, or will all fall into darkness?