There are 3 books in the Powder Mage series. The newest book is The Autumn Republic which came out in 2015.

1
Promise of Blood

Book cover of Promise of Blood
'The Age of Kings is dead. And I have killed it.' Field Marshal Tamas's coup against his king sends corrupt aristocrats to the guillotine and brings bread to the starving. But it also provokes war in the Nine Nations, internal attacks by royalist fanatics and greedy scrambling for money and…
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2
The Crimson Campaign

Book cover of The Crimson Campaign
'The hounds at our heels will soon know we are lions.' Tamas's invasion of Kez ends in disaster when a Kez counter-offensive leaves him cut off behind enemy lines with only a fraction of his army, no supplies and no hope of reinforcements. Drastically outnumbered and pursued by the enemy's…

3
The Autumn Republic

Book cover of The Autumn Republic

'Just plain awesome . . . Innovative magic, quick-paced plot, interesting world. I had a blast' Brandon Sanderson on Promise of Blood

Field Marshal Tamas has finally returned to Adopest, only to find the capital in the hands of a foreign power. With his son Taniel presumed dead, Tamas must…