Mana listened to Serena's quick run down on their predicament. Her eyes widened slightly, though seemed to understand. "Oh my! That is quite a pickle that you are in. Weelll, Apep is a God of Darkness. It was said that he started after feeling the craving for power over his sibling gods. He wanted dominion the whole world. An Eternal Darkness. In order to achieve this, he needed the Prince's power." Mana explained. Yami seemed to be in thought as the Dark Magician Girl gave some explanation. "I can see why now he wanted me now. But that does not explain why he needs my heart, whatever he maybe referring to."