I really interesting premise and the action captures the reader from the start, good job! We get to see the power of what a Soul Stone can do, but given the coming-of-age element I would seem that we also get to see it develop from the start. 

Really nice, polished writing. A few tweaks needed here and there in wording to help the flow, but they'll come out nicely when revising :)

You've definitely set the stage for an interesting world. It's quite a comfortable one that most fantasy readers will be familiar with, but I'm sure you'll have some twists along the way!

Good job, keep it up :D