The 666th Floor (DOTMS Spin-off)

Spin-off of the DOTMS series. Have you ever wondered what other floors there are? The Empire State building has 102 floors, Olympus is the 600th floor, but what about in-between or above? In this story, (Fem)Percy goes to the 666th floor, where it is an alternate universe of her world(Basically, the real Percy Jackson's world) and well, you'll just have to read to find out the rest