There are 4 books in the Instrumentalities of the Night series. The newest book is Working God's Mischief which came out in 2014.

1
The Tyranny of the Night

Book cover of The Tyranny of the Night
Moon, once a solitary wanderer, has become consort to Jade, sister queen of the Indigo Cloud court. Together, they travel with their people on a pair of flying ships in hopes of finding a new home for their colony. Moon finally feels like he's found a tribe where he belongs.…
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2
Lord of the Silent Kingdom

Book cover of Lord of the Silent Kingdom
It's cold.  The wells of power are weakening and the forces of Night grow strong. The gods are real, and still have some power, mostly to do harm.  The Instrumentalities of the Night are the worst of these.
 
Piper Hecht, born Else Tage, survived a battle with the Instrumentalities. Now…

3
Surrender to the Will of the Night

Book cover of Surrender to the Will of the Night

Piper Hecht's first and greatest secret is that he knows how to kill gods. What's not a secret is that he knows how to win wars.

Hecht's secrets make him dangerous, but his skill and his reputation put him in danger―from his enemies, who fear what he might do or…

4
Working God's Mischief

Book cover of Working God's Mischief

Arnhand, Castauriga, and Navaya lost their kings. The Grail Empire lost its empress. The Church lost its Patriarch, though he lives on as a fugitive. The Night lost Kharoulke the Windwalker, an emperor amongst the most primal and terrible gods. The Night goes on, in dread. The world goes on,…