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while, there was a serious argument on the subject between
Slytherin and Gryffindor, and Slytherin left the school [...]
Reliable historical sources tell us this much,” he said. “But
these honest facts have been obscured by the fanciful
legend of the Chamber of Secrets. The story goes that
Slytherin had built a 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.”
There was silence as he finished telling the story, but it
wasn’t the usual, sleepy silence that filled Professor
Binns’s classes. There was unease in the air as everyone
continued to watch him, hoping for more. Professor Binns
looked faintly annoyed. “The whole thing is arrant
nonsense, of course,” he said. “Naturally, the school has
been searched for evidence of such a chamber, many times,
by the most learned witches and wizards. It does not exist.
A tale told to frighten the gullible.”
Hermione’s hand was back in the air. “Sir — what exactly
do you mean by the ‘horror within’ the Chamber?”
“That is believed to be some sort of monster, which the
Heir of Slytherin alone can control,” said Professor Binns
in his dry, reedy voice.
The class exchanged nervous looks. “I tell you, the thing
does not exist,” said Professor Binns, shuffling his notes.
“There is no Chamber and no monster.”
“But, sir,” said Seamus Finnigan, “if the Chamber can only
be opened by Slytherin’s true heir, no one else would be
able to find it, would they?”
“Nonsense, O’Flaherty,” said Professor Binns in an
aggravated tone. “If a long succession of Hogwarts
headmasters and headmistresses haven’t found the thing —
”