The Tale of the Lost Sister a PJO/HP Crossover

This will be the story of the Third Great Prophecy, a quest will begin with The seven, Reyna, Nico, Will, Rachel, Thalia, Grover, and a new girl whom you'll learn about in the story. This is a Percy Jackson/Harry Potter crossover. Though it starts with just Percy Jackson stuff. Takes place after the Giant War and the Second Wizarding War (yes I know it isn't the same timeline, deal with it). Military time will be used, I will clarify what different times mean before the story starts and also will describe the rules of the this version of the world
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(warning some minor vulgarity and mature themes)
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(characters/locations/references to past work belong to Rick Riordan and J.K Rowling except a few that I created, also I own the plot)