Need a book identified

Can anyone provide a title and author for this story:

] I'm having difficulty finding a book I once read. It was a fantasy stor=
y starting with a kid going to get a branding on the back of his neck, wh=
ere he's then pulled aside into a quest by a rogue clan to remove power f=
rom the dominating dragon overlords by stopping the flow of magic they re=
ceive from the people by killing a sort-of middle man dragon that ensures=
 they all have the same power by acting as a bottleneck for the flow of m=
agic from the people to the dragons. The kid goes on a journey across the=
 mountains and the ocean to get to the monastery like place where the mid=
dle man dragon is living. He gets in trouble with the law on the way and =
in the process rips off his neck-branding and replaces it, like a fake ID=
. He eventually kills the dragon by poisoning. There was some bit in ther=
e somewhere that said he was the only one that could do this because, unl=
ike the other people who could hold SOME magic, he was unable to hold any=
 at all and was thus impervious to the negative effects of being in conta=
ct to the sheer amount of magic that flows to and from this middle man dr=
agon. He ends up getting powers because the loose magic from killing the =
important point of power latches on to him. It ends with them walking bac=
k down the mountain they were on top of, talking about the events. There =
was another scene somewhere in the middle where he's thrown in jail and m=
eets another species person man that's really good at digging and they di=
g their way out and people notice and they scatter. He runs to the docks,=
 pays for a boat, and nopes away. Learning to fish and, as deliberately s=
tated in the book, got a really nice tan. Just in case, the land mass is =
stated in the beginning to look like a hand, and he had to travel across =
the thumb. I'm sorry if this is too lengthy. It's just pissing me off tha=
t I can't seem to remember anything about this book that would help me fi=
nd it.

Thank you!

Colleen
Colleen Cahill
[email protected]