A ruined Hogwarts

When Harry Potter was sorted into Slytherin, and when Grindelwald became the headmaster of Hogwarts, Owen knew that the familiar world was about to change beyond recognition.
Facing an increasingly collapsing world, an increasingly collapsing school, and an increasingly collapsing self, Owen can only maintain his life like this by doing magic at Hogwarts and raising a Dark Lord.
So, let us salute the birth of the third generation of Dark Lord Harry Potter!
Harry:? ? ? Why do I feel something is wrong?
"I am not a cunning dark wizard, just a magician motivated by interest." Owen Shafik said, "So, do you expect a miracle? It doesn't matter whether it's good or bad."
"Magic is a trick, and the greatest magic is to deceive the whole world!"
(The characters in the original work are not broken, but slightly dark.)