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"...although he could barely see out of it, he pointed his wand through the smashed window and started muttering incantations of great complexity. Harry heard a weird rushing noise, as though Flitwick had unleashed the power of the wind into the grounds."
— Flitwick casting protective charms over Hogwarts castle before the Battle of Hogwarts[src]

Protego horribilis was the incantation of a powerful protective charm.[1]

Description[]

It was probably the most powerful version of the Shield Charm, which was used as a protective enchantment against anything approaching the protected area, and against any dark magic, except the Killing Curse, which was unblockable with any Shield Charm and passed through it, presumably leaving holes into the magical shield. By extended use of a spell, the magical shield could eventually be broken down.[2]

History[]

This spell was cast by Charms Master Filius Flitwick to protect the boundaries of Hogwarts Castle from the Death Eater's forces in the late hours of 1 May 1998, prior to the Battle of Hogwarts that started the next day.[1]

This may have been the spell that the professors cast around Hogwarts Castle to protect it from Dementors and other dark creatures before the Siege of Hogwarts in the 2010–2011 school year.[3]

Known practitioners[]

Etymology[]

Latin Protego, "protect", and Horribilis, "horrible, frightful, dreadful"; altogether the charm means "Protect against the horrible".

Behind the scenes[]

Appearances[]

Notes and references[]

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