Thirteen is a bit young for a kid to run around looking all goth and smacking people around with shadows. At least fifteen or sixteen would be better. Umbrakinesis was right, Solemn! Shadowmancy does sound cool, but kinda magical. With the powers, I get the talking to them at a young age, but saying its a power years later when all he has to do is think about it to manipulate them into attacks and defenses is kind of odd. Now if he talks to them openly, like say.... "Can somebody give me a hand, or a foot?" and then a fleeing enemy gets tripped by the rising shadow of a street post... that's something else. But if he gets shadows from a wall and forms them into hammers and stuff, that's completely different as well. So how are you willing to tone down the shadow powers so he doesn't seem too OP'ed or crazy? I'd personally like the whole talking to shadows to get them to do things and come to life somewhat. Asking them about info like each one is a walking two-way. Kinda reminds me of Hawksmoor from the Authority, the "King of Cities" literally would tell pieces of the city to do things and skyscrapers would turn into giant arms and stuff. T'was awesome. 

~KL~