Frostborn: The Shadow Prison (Frostborn Series #15)

Ridmark Arban is ready to face the terrible Frostborn in a final battle.

But even the mighty Frostborn themselves have been duped, for the shadow of Incariel has used them as its weapons.

Unless Ridmark can defeat the Shadowbearer, the shadow of Incariel shall rise and devour the world for all time...