Frostborn, The Dwarven Prince: Frostborn Series, Book 12 (Unabridged‪)‬

Ridmark Arban is the Gray Knight, and he leads the battle against the powerful and deadly Frostborn. But the Frostborn are winning, and without allies, the men of Andomhaim have no hope of victory.

The power of the dwarves of Khald Tormen might turn the balance, but the dwarves face their own ancient enemy.

And that ancient enemy has plans of his own for Ridmark....