Wraithbound

Since he was a boy, Rae Kelthannis has dreamed of being a stormbinder like his father, with an air elemental stitched into the fabric of his soul and the winds of heaven at his command. Those dreams died when his father, through no fault of his own, fell into disgrace and was banned by the justicars of the Iron Council. The family fled to the edge of the Ordered World, to live in fear in the shadow of encroaching Chaos.

When Rae defies his father's orders and attempts to stitch an air elemental to his soul, he instead binds himself to a mysterious wraith. That's when things get complicated and the world starts to fall apart around him. Literally.