Diabolic trilogy

Nemesis is a Diabolic. Created to protect a galactic Senator's daughter, Sidonia. The girl who has grown up by her side and who is as much as sister as a master. There's no one Nemesis wouldn't kill to keep her safe. But when the power-mad Emperor summons Sidonia to the galactic court as a hostage, there is only one way for Nemesis to protect Sidonia. She must become her. Now one of the galaxy's most dangerous weapons is masquerading in a world of...

"In the final book in the Diabolic trilogy, Nemesis must choose between love and justice as she watches her once-idealistic husband ravage the galaxy through his tyrannical rule"--