Getting all 5 of the Potions cards will give you 5 phials of Girding
Potion (yellow stuff), which protects you for 20 seconds against harm.
Hesper Starkey (1881 - 1973)
Description : Witch who studied the use of phases of the moon in
Location : In a chest on a ledge behind the Whomping Willow.
Beaumont Marjoribanks (1742 - 1845)
Description : Pioneer of Herbology. Discovered Gillyweed.
Location : It is inside a chest lying in the bonus room sealed by the
portrait of an old witch in the Portrait Room.
Gaspard Shingleton (1959 - Present)
Description : Celebrated inventor of the Self-Stirring Cauldron.
Location : In a chest inside the gold door-locked room in Moaning
Clover Hipworth (1742 - 1805)
Description : Inventor of the Pepperup Potion, cure for the common
Location : On a ledge in the Avifors challenge room.
Sacharissa Tugwood (1874 - 1966)
Description : Pioneer of Beautifying Potions. Discovered the properties
of Bubotuber Pus.
Location : In a chest inside the Great Hall.