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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 casts enchantments such as this one over the school[src]

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

Known practitioners

Etymology 

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

Behind the scenes

Appearances

Notes and references

  1. Harry Potter and the Deathly Hallows, Chapter 30 (The Sacking of Severus Snape)