Collaborative Fanfic

It's been 12 years sine the giant war, and new demigods appear.
Its been a year, and the elves are still fighting the Neverseen.
What happens when a group of both appear?
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Chiara is a 13 year old Elfigod, though she doesn't know it. She thinks she is a demigod, daughter of Hades. What happens when she accidentally shadow-travels with a few friends into the Lost Cities?