Can't Remeber

[hndsmejack]

I read this book a couple of years ago. It's focused around a guy who was given Metal Hands and indoctrinated into a religious order and a commander in an Empire's military. The Empire is in disarray because the Emperor was assassinated by the religious order, and the line of succession is heavily disputed. A fleet of black ships was seen coming from a volcanic island and they attacked a coastal city. I, regrettably, never finished the book and it has lead me to here. If anyone knows this book I would greatly appreciate your help.