"Funny, the damage a silly little book can do,

especially in 

                        the hands of a silly little girl..."                         

When Tom Marvolo Riddle was in his fifth year at Hogwarts, he used his ability to speak Parseltongue to open Salazar Slytherin's Chamber of Secrets. He further used this language ability to order the Chamber'sbasilisk to terrorise the school and hunt down its Muggle-bornstudents. Eventually one, a Ravenclaw girl named Myrtle, was killed. Riddle used this murder to infuse the journal with a piece of his soul, transforming it into a Horcrux.

"The diary was proof that he was the heir of 

Slytherin; I am sure that Voldemort considered it 

of stupendous importance."