Dark Magic Horcrux (Rewritten)

What if Fudge was a bit smarter, but crueler? He had someone make a Dark Magic tracker, which tracked down the Horcrux in Harry's head. On Harry's 11th birthday, the Aurors tracked him down and arrested him. But when they took him to Azkaban, they threw him into Sirius's cell... (This has WolfStar) Rated T for swearing