Harry Potter: Patronus Charm - Expecto Patronum
The Patronus Charm is a charm that evokes a partially-tangible, positive energy force known as a Patronus. Patronuses are also called spirit guardians[3][1] though this may only refer to corporeal Patronuses. It is primarily designed for defence against otherwise unbeatable Dark creatures like Dementors and Lethifolds, though there are other uses. The incantation is Expecto Patronum
reference: http://harrypotter.wikia.com/wiki/Pat...
a compilation of footage where the spell has been used from Harry Potter films.
Harry Potter and The Prisoner of Azkaban
Harry Potter and The Order of the Phoenix
Harry Potter and The Deathly Hallows Part 1
Harry Potter and The Deathly Hallows Part 2
Known practitioners:
Harry Potter
Hermione Granger
Ronald Weasley
Luna Lovegood
Ginny Weasley
Aberforth Dumbledore
Seamus Finnigan
Remus Lupin
Severus Snape
clips credited to: Warner Brothers Inc.