Talk:Ma/@comment-7342272-20131030194507/@comment-16456175-20131107023835

It is mentioned that she swapped bodies with Kayo out of envy, keep that in mind. The only major event occuring between this and the last known time Elluka had a vessel of sin in her possession was the battle of Marigold Plateau, so perhaps something happened there to make Elluka vulnerable to the sins' influence.