Crimson Campaign (Powder Mage 2)

Field Marshal Tamas’s invasion of Kez has ended in disaster. Stranded behind enemy lines and hounded by the enemy’s finest, Tamas must lead his remaining men on a reckless retreat through northern Kez to safety.
In Adro, Inspector Adamat wants only to rescue his wife. To do so, he must hunt down and confront the enigmatic Lord Vetus – but the truth he learns is far darker than he could have imagined.
The god Kremsimir wants the head of Tamas’s son, Taniel – the man who shot him in the eye. With Tamas and his powder mages presumed dead, only Taniel can lead the charge against the vengeful god and his invading army.