Hogwarts Crossover- Evil Arising

It's the second year at Hogwarts for Tris, Percy, Peeta, Tobias, Annabeth, Harry, John, Sherlock, Hermione, Hazel, Gus and Katniss, and with Moriarty gone, they believe that they can finally settle down and have a normal year at Hogwarts. But they knew, deep down, that that would never happen!

This year, there has been a new evil wizard who has been destroying the wizarding world around them. And rumour has it that he needs to get into Hogwarts to retrieve something that he lost when he was a student there.

Meanwhile, the quidditch cup is up for grabs again, and there is a weird object that a second year has found in the grounds of Hogwarts. How far will he go to keep the object from dark forces when he discovers it's true meaning?