The Cursed Creator

Everyone thought it was gaia who created the world , but what if they were wrong. What if there was another godess who actually created the world and gaia. But where is she now?
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Percy and his friends have to evacuate a demigod from a school. While doing so they find out that the monsters are not trying to kill the demigod , they are protecting her. What is going to happen when the oldest goddess awakens?