The Slain Divine (Vagrant Gods, 3) by David Dalglish

In the thrilling conclusion to USA Today bestselling author David Dalglish’s new epic fantasy trilogy, a usurped prince must master the magic of shadows in order to reclaim his kingdom and his people.
The Everlorn Empire’s grip on Thanet is tighter than ever. The God-Incarnate himself has arrived on its shores to crush the struggling rebellion and carry out his final, sinister plan: he will sacrifice the entire island in order to rise, reincarnated from its ashes.
The rebellion is struggling to separate allies from enemies, and to figure out a way to stop the slow destruction of everything and everyone they care for. Meanwhile, Cyrus is disappearing deeper beneath the vicious mask of the “Vagrant”. Under the mantle of the legendary assassin, he may be strong enough to take down the Empire, but at what cost?