A Court of Ruin and Rain - The Rift Chronicles, Book II

Elara and Kaelen have fallen. Separated from the mortal realm, they are trapped in a dimension of endless gray ash and bone-chilling cold. Here, the sun never rises, and the fire in Elara's blood is nothing but a dying spark.
Ruling over this dead land is Draven, the Ash King-a monster with a gentleman's smile and a terrifying agenda. He has been waiting for them. He doesn't just want to break them; he wants to use Elara's unique power to shatter the ancient seal that binds him to this prison.
For Kaelen, the Hollow is more than a cage; it is a graveyard of family secrets he has spent a lifetime running from. For Elara, it is the ultimate test of survival.
With their magic stifled and time running out, they must ascend the Obsidian Spire to find a way home. But the tower is alive, the shadows are hungry, and the price of escape may be the very world they are trying to save.

In a kingdom of ruin, love is the only weapon left.