Shadowblack (Spellslinger #2) by Sebastien de Castell
A failed mage turned outlaw must use guile and a handful of spells to challenge a dangerous rival in the second book of an exciting adventure fantasy series from Sebastien de Castell.
Forced to live as an outlaw, Kellen relies on his wits and his allies to survive the unforgiving borderlands.
When he meets a young woman cursed with a deadly plague, he feels compelled to help. But her secrets draw powerful enemies and it's not long before Kellen is entangled in a conspiracy of blackmail, magic, and murder. As the bodies begin to pile up, Kellen fears he's next.
The second novel in a compelling six-book series, bursting with tricks, humor, and a whole new way to look at magic.