In an age long before 40K, there existed a child that was created not by parents but by Fate. This child would be seen as a liar and deceiver on the Triwizard Tournament. Wishing power and to make those in power pay for wishing his death, Harry Potter uses a ritual gain untold magic. There are plots to create and unweave in this Tournament. (Evil Dumbledore and Weasley family)
Harry Potter returns for his Second Year at Hogwarts, and the Chamber of Secrets has been opened. But that is not the only thing that has changed. In the 31st Millennium, history has been rewritten, and nineteen young Primarchs have been blasted back through time to the close of the 20th Century, hidden far from the Ruinous Powers. And they too are attending Hogwarts this year!