Otherworldly Invasion
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The Gods of Arcadia feared the worst. A malicious force had infiltered into Earth below their very noses. The many cracks left behind by the Demon King of Miasma's attack had yet to be healed. The largest and most obvious ones were healed, but smaller ones, as little as the head of an ant were not as easy to repair, and there were thousands of them distributed everywhere.
Of course, no normal living being could get through them except extremely small insects which would only be harmless at most. But these small cracks still bean to fill Earth with the Mana of Arcadia with each passing second, slowly yet steadily.
However, certain entities, perhaps those that lack a physical body, could easily get through them… And that's exactly what happened. As the Gods attempted to find a solution, the Demon King of Death, Thanatos, laughed from within the Underworld, celebrating that one of his underlings, one that lacked a physical body, had managed to infilter this "new world".