Marauder's Phase - Chamber Of Secrets

As Harry, Ron, Hermione, Lillica, and Teddy head into their second year at Hogwarts School Of Witchcraft And Wizardry, what lurks beneath the school that seems intent on making it their LAST? A semi-rewrite of Chamber Of Secrets, to include my OCs. Gets a bit .A.U. at times. Hopefully it flows seamlessly enough that you can't always tell the original writing from my own.