The boys of Huaxia dream of pairing up with girls to pilot Chrysalises, giant transforming robots that can battle the aliens that lurk beyond the Great Wall. It doesn't matter that the girls die from the mental strain. When Zetian offers herself up as a concubine-pilot, it's to assassinate the ace male pilot responsible for her sister's death. But when she gets her vengeance, it becomes clear that she is the rare kind of female pilot who can sacrifice males to power up Chrysalises instead.14+ A blend of Chinese history and mecha science fiction for YA readers.