The Philosopher's Stone.

I've read about those. When the smoke turns red, it means you've forgotten something.

No, that's all I need! You to set my bloody kneecups on fire!

That's what's under the trap door. The Philosopher's Stone.

"The only Stone currently in existence belongs to Mr. Nicholas Flamel...

At the end of the year, the house with the most points is awarded the house cup.

This is the most direct path to the dormitories.

...who possess the predisposition...

powerful it is known as the Draught of the Living Dead.

...gives a student the right to walk about the school at night.

God, I miss the screaming.

And the points stand thus:

It's not real, the ceiling. It's just bewitched to look like the night sky.

...that the third-floor corridor on the right hand side is out of bounds...

I knew the name sound familiar. I read it on the train that day.

The Sorting Ceremony will begin momentarily.

Who's the one wizard Voldemort always feared?

As for monkshood and wolfsbane, they are the same plant, which also goes by the name of aconite.

The swish and flick. Good. Oh, and enunciate.

I thought you said the four of us.