A cataclysmic battle has been fought and won, sparing the golden city of Prontera from destruction at the hands of the evil necromancer Himmelmez. However, in the midst of the melee, the Valkyrie Sarah Irine stole a shard of the Heart of Ymir--the life source of Midgard--from the city's vaults. Though shrouded in mystery, one thing is known for certain about the heart: whomever possesses it wields ultimate power.