Protego horribilis

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Protego Horribilis is a variation of the Shield Charm which protects an area against highly Dark Magic.

Known uses
This spell was used by Professor Filius Flitwick to protect Hogwarts Castle during the Battle of Hogwarts.

Etymology
Latin Protego, "I protect", and Horribilis, "horrible, frightful, dreadful".

Appearances

 * Harry Potter and the Half-Blood Prince
 * Harry Potter and the Half-Blood Prince (film)
 * Harry Potter and the Deathly Hallows
 * Harry Potter and the Deathly Hallows: Part 2

Notes and references
Varjelum kamalus