Eran is born from the passion of the people. As such, the moment their passion and feelings bloom, she becomes stronger. Yet, the moment their passion dims, she slowly gets weaker and weaker....
From the very beginning, Eran has always been with he irregulars, even from outside the tower. As such, her presence have always been taken for granted. As Jahad and the rest climb the tower, their passion started to disappear and their feeling turned cold. As such, every second of every day, she turned weaker.
Yet, she kept her weakening self hidden. The moment Arlene and V left, she couldn't hold her form anymore. Then, she disappeared quietly, alone.
Now, after thousands of years, she finally gathered enough power to live independently, without being affected by the desires, passions and feelings of others affecting her.