"Good morning, everyone!" Professor Hall greeted the students as they entered and sat down. "In light of the prank pulled on the school on Halloween, I felt it was necessary to go over some commonly told myths and legends regarding the Chamber of Secrets. The story goes that Slytherin had built a hidden chamber in the castle, of which the other founders knew nothing. Slytherin, according to the legend, sealed the Chamber of Secrets so that none would be able to open it until his own true heir arrived at the school. The heir alone would be able to unseal the Chamber of Secrets, unleash the horror within, and use it to purge the school of all who were unworthy to study magic."