Iron Widow Series by Xiran Jay Zhao

The boys of Huaxia dream of pairing up with girls to pilot Chrysalises, giant transforming robots that can battle the mecha aliens that lurk beyond the Great Wall. It doesn't matter that the girls often die from the mental strain. When 18-year-old Zetian offers herself up as a concubine-pilot, it's to assassinate the ace male pilot responsible for her sister's death... moreThe boys of Huaxia dream of pairing up with girls to pilot Chrysalises, giant transforming robots that can battle the mecha aliens that lurk beyond the Great Wall. It doesn't matter that the girls often die from the mental strain. When 18-year-old Zetian offers herself up as a concubine-pilot, it's to assassinate the ace male pilot responsible for her sister's death. But she gets her vengeance in a way nobody expected—she kills him through the psychic link between pilots and emerges from the cockpit unscathed. She is labeled an Iron Widow, a much-feared and much-silenced kind of female pilot who can sacrifice boys to power up Chrysalises instead.​ To tame her unnerving yet invaluable mental strength, she is paired up with Li Shimin, the strongest and most controversial male pilot in Huaxia​. But now that Zetian has had a taste of power, she will not cower so easily. She will miss no opportunity to leverage their combined might and infamy to survive attempt after attempt on her life, until she can figure out exactly why the pilot system works in its misogynist way—and stop more girls from being sacrificed. less

Zetian, now ruler of Chang'an, must balance dangerous politics with her quest for revenge in the sequel to the #1 New York Times bestseller Iron Widow, a blend of Chinese history and mecha science fiction. Having reclaimed her homeland from the Hunduns and learned the true nature of the gods, Iron Widow Zetian returns to Chang'an with Emperor-General Qin Zheng to rule together and attempt to deconstruct the corrupt and misogynist system that plagues the country... moreZetian, now ruler of Chang'an, must balance dangerous politics with her quest for revenge in the sequel to the #1 New York Times bestseller Iron Widow, a blend of Chinese history and mecha science fiction. Having reclaimed her homeland from the Hunduns and learned the true nature of the gods, Iron Widow Zetian returns to Chang'an with Emperor-General Qin Zheng to rule together and attempt to deconstruct the corrupt and misogynist system that plagues the country. However, she must not only contend with political unrest and continued Hundun attacks but also with the gods themselves, who hold Li Shimin's life in their hands and seek to control Zetian as their puppet. Dangerous forces seek to undermine Zetian at every turn. Can she enact positive changes as a fair and just ruler, and change the system from within? Or will she be forced to rely on fear and violence, and succumb to her darker instincts, becoming almost as corrupt as Chang'an's previous rulers, in her quest for vengeance? Find out in this highly-anticipated sequel to Iron Widow, a #1 New York Times bestseller! less