Amplifying Charm

Sonorus (latin for "loud") is the incantation for the spell used to amplify a person's voice. This spell is used most notibly in Harry Potter and the Goblet of Fire by Lodo Bagman to project his voice during his commentary in the Quittich World Cup and during the Triwizard Tournament at Hogwarts School. Usually reversed through the incantation, Quietus.