Collecting all 5 Charms cards will give you another spell: Alohomora.
With Alohomora, you can unlock gold doors and locks.
Merwyn the Malicious (Dates Unknown)
Description : Credited with the invention of many unpleasant jinxes and
Location : Found in an alcove when you hanker after the fifth Golden
Star in the Leviosa Challenge.
Bridget Wenlock (1202 - 1285)
Description : Famous Arithmancer. Established the magical properties of
Location : In a secret room in the Portrait Room. Open it by first
examining a darkened board on the northern wall, then pushing the chair
onto the switch that is revealed.
Felix Summerbee (1447 - 1508)
Description : Inventor of Cheering Charms.
Location : In a chest in the challenge inside Flitwick's Office (not to
be confused with the Leviosa Challenge).
Ignatia Wildsmith (1227 - 1320)
Description : The witch who invented Floo powder.
Location : Found in a locket in a chamber opened when you light two
Wizard Candles in the Gryffindor Common Room.
Quong Po (1443 - 1539)
Description : Chinese wizard who discovered the uses of powdered
Location : Inside the bonus room sealed by the portrait of a wizard
with a red cloak around his shoulders in the Portrait Room.