Way of the Argosi by Sebastien de Castell (Ferius Parfax 1 - A Spellslinger Novel) {BooksHash}

Ten year old Ferius Parfax has a simple plan: kill every last inhabitant of the spell-gifted nation that destroyed her people, starting with the man who murdered her parents. Killing mages is a difficult business, of course, so Ferius undertakes to study the ways of the Argosi: the loosely-knit tribe of tricksters known for getting the better of even the most powerful of spellcasters. But the Argosi have a price for their teachings, and by the time Ferius learns what it is, it may be too late.

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