Empire of the Damned (Empire of the Vampire, Book 2) by Jay Kristoff...

But the Last Silversaint faces peril, within and without. Pursued by terrors of the Blood Voss, drawn into warfare between the Blood Dyvok and duskdancers of the frozen Highlands, and ravaged by his own rising bloodlust, Gabriel may not survive to see the Grail learn her truth.

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