Mistress 9 is the Leader of the Death Busters, a Sovereign of Silence, and a Commander of the Dark Universal Empire. She was Responsible for wreak havoc the city, and also armed with Cybernetic Cannon to Destroy enemy garrison after an intense battle of Italy of the Planet Earth. In an instant, she marked as an enemy to be constructed with Genetic, and cybernetic enhancements and making her as human.
Mistress 9 was born as a super intelligent Human, and marked as a leader of Death Busters roam through the galaxy. She went on her first target to hunt down Zephyr Shields at the Chernobyl ruins on the quest to retrieve an artifact. NEST Major Captain Lennox and his soldiers evade from Xeno-Dracus, until Zephyr Shields disarmed an artifact until Mistress 9 arrives from the sky, watching them in anger before departing. The Two retreats from the ruins and moved on back into Xenonaira's Capital city of Maliferous.
Mistress 9 approach to Xenomorpheus Skywalker, replying which the Celestial Federation's Alliance of Universe can unite with soldiers about fifteen days later. In anger, she clungs one of Xenomorpheus' Lieutenants with a cybernetic arm, realize not to kill them, but she ordered Ansem, Seeker of Darkness to launch a garrison of Heartless for a space attack against the Federation Starfleet, and Interstellar Freedom. Mistress 9 never heard from again during the battle of the Heartless Navy Fleet.