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The Patronus Charm is the most famous and one of the most powerful defensive charms known to wizardkind. It's an immensely complicated, very difficult spell that evokes a partially-tangible positive energy force known as a Patronus or spirit guardian.

The Patronus Charm (Expecto Patronum) is the most famous and one of the most powerful defensive charms known to wizardkind. It's an immensely complicated, very difficult spell that evokes a partially-tangible positive energy force known as a Patronus (pl. Patronuses) or spirit guardian. The charm was primarily designed for defence against Dementors and Lethifolds, against which there is no other protection. Albus Dumbledore, however, invented a means of using one's Patronus as a messenger to other witches and wizards, and this is the method of communication that the Order of the Phoenix uses.