Since the beginning of time, the world of Aria was governed by Inosia, the Goddess of Light, and Zerdantis, The God of Darkness. Their powers and roles were balanced, and the world was in peace. But Zerdantis grew greedy and wanted to rule the land himself, and opened a dimensional gateway to summon demonic creatures and spirits into Aria. To assassinate the goddess, he summoned his most powerful beings such as Kerberos to attack the Temple of the Goddess. Heavily outnumbered, the Goddess Inosia created an Ark Sign that contained all her remaining power, and summoned two heroes from the dimensional gateway that Zerdantis created. The heroes used the Ark Sign to seal the dimensional gateway, sealing away Zerdantis for eternity. With no remaining power, Inosia slowly dissipated into the ether world.
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Since the beginning of time, the world of Aria was governed by Inosia, the Goddess of Light, and Zerdantis, The God of Darkness.