Dawnbreaker

The king is dead.
The world is lost.
Long live the queen.
The membrane of magic separating the human and demonic planes is fading.
Nightrender, the immortal warrior of the gods, must find a way to rebuild it, but Hanne—the serpent queen, always too hungry for power—has her own plans … plans that will bring two worlds crashing together.
Meanwhile, young King Rune—married to Hanne, but in love with Nightrender—is lost in the realm of demons after a disastrous battle, wandering alone in a twisted landscape of bitter earth, bone spires, dry lightning, and winds blowing ash.
In this second and final installment of the Nightrender duology, the circle will close, and the world will be saved—or burnt to a cinder.