Protego Maxima

Protego Maxima is a stronger version of the Shield Charm which protects a very large area.

Known uses
This spell was used by Professor Filius Flitwick and other Order of the Phoenix members to protect Hogwarts Castle during the Battle of Hogwarts.

Etymology
Latin Protego, "I protect", and "Maxima", which means "very great" or "greatest".

Behind the Scenes

 * This is probably an invention of the filmmakers, much like "Lumos Maxima" and "Bombarda Maxima".
 * In the eight film, not only Flitwick cast Protego Maxima, Molly Weasley and Horace Slughorn also uses it.

Appearances

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