The truth always come out (Dark harry potter Au)

Harry was in the second bedroom he been moved there because the Dursleys were getting suspected as horrible people as no one ever saw Harrys room, so they gave harry the smallest room in the house which was Dudley second room and Dudley was not happy.

Anyways harry is so close to turning 14 years old there only a few more minutes left. Harry just sits on his bed looking at the roof.

So a few more minutes until I'm officially 14 years old I thought I would have been dead at 12... harry says as he looks at the roof then the clock in his room that says there 10 seconds to his birthday

Harry looks until the last few seconds then starts counting down.

5.....4.....3....2.....1......

What happens next?