Eternal Dawn

The night is over. But the sun must rise one last time.
The War of the Zenith is won. Kathryn is gone, and the world is safe. But victory has left a hollow silence. Mathias Auer lies in a deep magical coma, his soul shattered by the force of the Void he used to save the world. To the surviving European Council, he is a dangerous artifact to be studied. To Mairin Cote, he is the other half of her soul.
Refusing to accept his death, Mairin makes a final, desperate vow: she will cross the veil between life and death to retrieve him.
Using her unique heritage as a Light-Bearer, Mairin projects her consciousness into the Astral Plane—a surreal, shifting landscape constructed of Mathias's darkest memories and deepest guilts. There, she must hunt down the shards of his identity and convince his Shadow Self that he is worthy of redemption.
But while Mairin fights for his soul in the spirit realm, her physical body lies vulnerable in the mortal world. Valerius, a rogue Council warmonger, has laid siege to their sanctuary, intent on seizing Mathias's empty vessel to engineer a new breed of super-soldier. Protected only by a powerless Tawnya, a fierce Loraine, and the loyal Jules, Mairin is running out of time.
If she wakes too soon, Mathias is lost forever. If she stays too long, she will never wake at all.
The final journey is not across the world, but into the heart.