mind that Cassandra Nova created a body for herself. Genocide After she was able to rebuild herself, Cassandra returned with a vengeance. She convinced the last living relative of Bolivar Trask, Donald Trask III, to activate a pair of enormous wild Sentinels and send them to destroy the mutant homeland of Genosha, killing 16 million mutants. Cassandra duplicated Trask's DNA so she could also issue orders to the Sentinels, programmed to obey only those with the DNA of a Trask. Cassandra infected her own body with millions of nanosentinels just as she was captured by Cyclops and Wolverine. Cassandra was taken to the X-Mansion, where she broke free and defeated most of the X-Men easily. Cassandra then put herself into Xavier's machine Cerebra (an enhanced version of Cerebro) and switched minds with her brother before Emma Frost snapped Cassandra's neck (Emma had been in Genosha teaching during the attack and witnessed her students massacred). Trapped in Cassandra's broken body, Xavier was unable to warn the X-Men before Cassandra, now in Xavier's body, shot him. Imperial Now in Xavier's body, Cassandra mentally forced the Xavier Institute student Beak to beat Beast into a coma after he discovered that Xavier and Cassandra shared the same DNA. Cassandra Nova then contacted the Shi'ar, whose leader was Majestrix Lilandra, Xavier's lover. Cassandra manipulated the Shi'ar Imperium, driving Lilandra insane and using her to make the Shi'ar Imperial fleet destroy the empire. Cassandra also made Lilandra send the Shi'ar Imperial Guard to wipe out the mutant population of Earth, starting with the X-Men. The Guard fought the X-Men until they were able to show the truth to the Imperial Guard. Angered at Cassandra's treachery and realizing the danger she posed, the Imperial Guard fought Cassandra, who defeated them and headed into the mansion. She had planned on using Cerebra to eliminate all mutants. However, Jean Grey (who was becoming increasingly powerful due to a manifestation of the Phoenix entity) was able to split Xavier's consciousness into pieces and store a little part of him in every single living mutant mind. When Cassandra used Cerebra and focused on all the mutants, the pieces of Xavier's mind were brought back together; at the same time, Jean Grey telepathically attacked, successfully defeating Cassandra, and forcing her out of Xavier's body. Without a body, Cassandra became pure psychic energy, bodiless and blind. Emma Frost tricked Cassandra into returning to