Seles Wilder, Zelos' sister, envies Zelos for his title as Chosen. Before the two were born Seles' mom killed Zelos' mom in attempt to kill him, so that Seles can take the power of Chosen. Because of this Seles is locked up in the South east Abby. Her secret love for Zelos is concealed however, and her will to help him shows throughout the game. She keeps his Cruxis Crystal with her in the SE Abbey. You will fight her in the coliseum in the city of Meltokio if you play as Zelos. You must do this to complete the monster manuel.