Potions is taught in one of the dungeons under the castle. This dungeon is large enough to accommodate a double class. It is colder here than in the main castle, and the surrounding walls contain many jars of pickled animals, which the students find particularly creepy. Ice cold water pours from a gargoyle's mouth into a basin in the corner. Moderator: Lucius Malfoy
The Slytherin Common Room is only accessible by people in the house, it's located deep down beneath the lake, and the common room is long and low with a rough stone ceiling and walls. It is lit by green-tinted lamps hanging by chains and carved chairs stand around a fire burning under an elaborate mantelpiece. Moderator: Lucius Malfoy