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 Sara 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.To keep the remaining shards out of the wrong hands, Chaos and his companions must embark upon a quest to locate and secure the remaining shards. The next shard is said to lie in Shwarzwaard, far to the north, beyond the Asgard Mountains. To reach it would take weeks on foot, so to stand a chance of success our heroes must take to the air in a Sky Ship. But when one of Freya's Valkyries sends Chaos and crew a message, the skies prove to be less than friendly.