It's been three years since Aren seized the Ember Blade. Far in the north, the Dawnwardens seek to unite the fractious clans of the Fell Folk and create a stronghold from which to retake their land. But even if they can overcome the danger of treachery from within, they still have to contend with the dreadknights. Only the druidess Vika can resist these near-unstoppable foes, and there's only one of her. But what if there was a weapon that could destroy the dreadknights? A weapon of such power it could turn the tide? A weapon that, if it fell into the wrong hands, might mean the end of all hope? The Shadow Casket has returned from out of the past, and it will save or damn them all.