User blog comment:Sorairo/Song Analysis/@comment-11109699-20130829010823

Day and night: the most iconic "struggle" for light and dark. If they "sever" it implys a loss of balance, and the disruption of natural forces. Grimm appear to be creatures of darkness, and are compared to shadows. If day and night literally severed in their favor, an unending, oppressive darkness would encompass the world, and the Grimm would probably slaughter humanity, hense "Hope and peace are lost forever."