The Face in the Window (Powder Mage, #0.7)

Taniel is a powder mage; a flintlock marksman with the ability to imbibe common black powder to strengthen his mind, body, and senses, as well as shoot over long distances. Sent into short-term exile by his father, he's supposed to see some of the world and cool his head, to learn something besides life in the Adran army. His arrival in exile, however, coincides with the eruption of a bloody new conflict as the colony of Fatrasta rises up against its Kez suppressers.

Taniel has certain talents that the Fatrastan militia could very well use, and he just can't help but get involved...