New narration by Alyssa Bresnahan Warbreaker is the story of two sisters Vivienna and Siri, who happen to be princesses. Theirs is a world where those who die in glory return as immortal gods; a world transformed by BioChromatic magic, a power based on an essence known as breath. By using breath and drawing upon the color in everyday objects, all manner of miracles and mischief can be performed.