>>95770945It's a long story
At the start of New Teen Titans V2, the Azarathians (people who raised Raven) let Trigon kill them so their souls could be weaponized and used by Raven to kill Trigon. It worked, but at the cost of the disembodied souls of Azarath forming a hive mind which was now evil from contact with Trigon. They possessed Jericho, turning him evil and having him kidnap the Titans with powers to use as hosts for the souls of Azarath; the rest of the Titans freed the captive Titans but the souls of Azarath fled Jericho's body when he was killed and ented Raven, who was also killed and abandoned in Azarath (which Jericho had set up as his HQ).
Raven's death meant her demon soul (Raven has two souls, her human soul and demon soul) could control her body. Raven was now evil and her first act was to summon the dead souls of all of Trigon's kids who were aborted/killed at birth when their mom found out they fucked the devil and absorbed them into her body. The plan, was Raven injecting them into living beings to allow them to "incubate" and kill the soul of the body they were implanted inside of. Hence why Raven was raping Starfire: she was putting one of her dead siblings souls inside of her to kill Starfire's mind so it could take control over her body (she also did the same to Beast Boy too).
The whole evil Raven thing didn't go over well (it was editorially mandated against Marv Wolfman's will) so he started undoing it after Zero Hour. He revealed that Raven's body was actually destroyed and her demon self simply killed/possessed a woman who looked 100% like Raven as her host body. Furthermore, it was revealed that Raven's human soul still existed and that was the soul implanted inside of Starfire.
