Harry destroyed the Tom Riddle diary Horcrux in the Chamber of ... with fiendfyre that was produced by Vincent Crabbe, one of Draco Malfoy's friends at Hogwarts. Voldemort hid the diadem Horcrux ...

Developing characters like Draco Malfoy and Severus Snape can add ... plenty of essential characters and is also the house of Tom Riddle, who went on to become Lord Voldemort.