After the Sluggish Memory Harry and Dumbledore discover the truth about Voldemot's immortality. He split his soul in 7 pieces and place those pieces in objects, so even if he dies, he would be able to return. objects such as: Tom Riddle's Diary Marvolo Gaunt's Ring Slazar Slyterin's Locket Helga Hufflepuff's Cup Rowena Ravenclaw's Diadem Nagini
And last but not least...
Harry Potter himself!
Appears on these pages
These private lessons took place during the course of Harry Potter's sixth year in 1996-1997...