Her Wrath Is the Apocalypse

The Void devours the world, and the last fortress survives only on the Holy Radiance Barrier of a young girl. Battle mage Rachel deems her a parasite, defiles her sacred power and casts her into the monster horde, unaware she is the source of all Void energy. When the holy lock breaks, the Void Queen awakens, the fortress crumbles, and the wicked meet their doom.