"Most Myth or Legends start with a basis of truth. Many Magical Historians and Mythologists, have said that Slytherin built a Chamber in secret, this not accurate. What we do know from the founder’s own journals is that each of them built their own Secret Chambers that they hid within the walls of Hogwarts. Each Chamber can only be accessed by their own Heirs. No one has any idea of where they could be, except maybe their descendants. A lot of History reports that Salazar Slytherin didn’t want those of impure-blood tainting Hogwarts, Muggleborns. He argued about it with his fellow founders, and they say that eventually it drove a wedge between Godric and Salazar, who were best friends. Salazar left the school, but before he did, he closed his Chamber, it is said that it would remain closed until his true Heir returned and opened it, and by doing so would release the horror within." Potter and Weasley were looking smug, but kept quiet after a glare from their Professor.