Tom Riddle's unidentified spell

Voldemort used this spell to take down Hogwarts's defences in 1998.

Appearances

 * Harry Potter and the Deathly Hallows: Part 2

Behind the Scenes

 * This spell may be a variation of Finite Incantatem 
 * This spell was only explicitly used in the movie version of Harry Potter and the Deathly Hallows: Part 2