The Patronus Charm is a charm that evokes a partially-tangible, positive energy force known as a Patronus (pl. Patronuses^[2]). 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 such as messenging.

Contents 1 The Charm 1.1 Casting 1.2 Difficulty 2 The Patronus 2.1 Non-corporeal 2.2 Corporeal 2.3 Uses 3 Etymology 4 Known Practitioners 5 Known Patronuses 6 Behind the scenes 6.1 Patronuses in the films 7 Appearances 8 Notes and references

The CharmEdit

CastingEdit

To successfully cast the Patronus Charm one must muster a happy memory (the happier the memory, the more powerful and tangible the Patronus will be) and incant "Expecto Patronum". It is unknown if there are any other elements requires in casting, such as physical gestures (aside from drawing and pointing the wand forward prior to or during incantation).

DifficultyEdit

The Patronus Charm is widely regarded as advanced magic (so much so that its not even taught in Charms on the Hogwarts curriculum). It is a very complex charm and many qualified wizards and witches have trouble with it. In fact, Harry Potter is one of the youngest known wizards able to cast a Patronus; he was taught how to do so in 1993 at the age of thirteen by Remus Lupin^[4]. In a Dumbledore's Army lesson, Harry taught the members how to use the charm. Some were even successful in casting a corporeal form, though Harry said this might be because there was no Dementor to make them frightened^[5]. However, some members were later shown to be able to cast corporeal Patronuses in the presence of Dementors^[6].

Amelia Bones and potential members of the D.A. were all very impressed when Harry Potter revealed that he could cast not only a Patronus Charm but a corporeal one to boot, which is notably more difficult than casting an incorporeal one. Given that the success of the charm is directly reliant on the caster retaining a particular mental state the Charm is more difficult to cast in emotionally trying circumstances. For instance, Harry Potter, Ron Weasley, and Hermione Granger all had difficulty casting their Patronuses when under the negative influence of Salazar Slytherin's Locket, one of Lord Voldemort's Horcruxes, and after witnessing the death of Fred Weasley in battle^[6]. This feature of the Charm is particularly unfortunate since the Charm's primary use is to defend against Dementors, Dark creatures specifically equipped to mentally unhinge people (and hence is partly why it is regarded as such advanced, difficult magic).

Self-confidence may also play an important role in casting the spell. In 1994 Harry is able to cast the spell successfully, driving off a large number of Dementors (which according to Severus Snape is only achievable by a very powerful wizard) thus saving Sirius and a younger version of himself, seemingly without recalling a happy memory, when he realizes that he has already done it. Although Harry could have had a "happy memory" upon realizing that he had saved all three of their lives.

The PatronusEdit

A successfully conjured Patronus can take two forms: non-corporeal or corporeal, and both types vary greatly in their appearances and strength.

Non-corporealEdit

A non-corporeal Patronus is one which does not resemble any living creature and has few distinguishing features (if any). Non-corporeal Patronuses resemble a burst of vapour or smoke without any clearly defined form shooting from the tip of the wand. While they may be partially effective at halting dementors (but not repelling them), non-corporeal Patronuses are not "fully-fledged" Patronuses, and are regarded as a more primitive or weaker version of the true Charm.

CorporealEdit

A corporeal Patronus is one that is completely and fully formed and takes the shape of a bright-white, translucent animal. A corporeal Patronus takes the form of an animal, like Animagus forms, that reflect the personality of the caster. They are, however, subject to change if the caster goes through an emotional upheaval of some sort. For example, Nymphadora Tonks's Patronus changed from its previous form to that of a four-legged creature which others guessed was a werewolf because then it would reflect her love of Remus Lupin, himself a werewolf^[5].

Another example is Severus Snape, whose Patronus was that of a doe, the same as Lily Evans, though this may have been the case all along rather than a change from its original form, as Snape was in love with Lily for most of his life. If a wizard is an Animagus and can summon a corporeal Patronus, the two may take the same form, as was the case for Minerva McGonagall and James Potter^[6]. Most Patronuses take the form of an ordinary animal, but magical creatures, such as Albus Dumbledore's phoenix Patronus, are not uncommon. The corporeal patronus is also better at repelling Dementors.

UsesEdit

There are two known uses for the Patronus charm. The first and main use of the Patronus is to drive off certain Dark creatures such as Dementors and Lethifolds, and is the only known charm that will work against them. As Dementors feed on happy memories to render humans to drown in sorrow and sadness, the Patronus acts as a shield of sorts, of which the Dementor would try to feed off of instead - the Patronus is comprised exclusively of positive feelings and cannot comprehend negative emotion, so the Dementor's influence cannot harm it.

The other use was devised by Albus Dumbledore, who invented a way of using the Patronus (corporeal and non) as a means of communication. They can deliver messages, speaking with the voice of the caster. This source of communication is believed to be exclusive to the members of the Order of the Phoenix. Using the Patronus for communication offers great advantages in security, as Patronuses identify the caster and are Dark-proof.^[5] A good example of this was when Minerva McGonagall used her feline Patronus to call for help to the other heads of houses in 1998 when she found out Harry Potter had returned to Hogwarts in search of Rowena Ravenclaw's Diadem. Another is when Severus Snape used his Patronus to lead Harry Potter to a pool in the Forest of Dean in 1997, where he had laid Godric Gryffindor's Sword for Harry to retrieve.

EtymologyEdit

Patronus means "protector", "guardian", or simply "patron" in Latin, specifically reflecting the entire role that the Patronus Charm plays. In archaic Latin, it meant "father", which is very interesting, considering that Harry Potter's Patronus is the same as his father's Patronus and Animagus form, a stag. The Latin word exspecto or expecto means "I look out for" or "I wait for", thus the charm's incantation roughly translates into "I await a protector."

Known PractitionersEdit

Known PatronusesEdit

Witch/wizard	Patronal form	Notes
Aberforth Dumbledore	Goat	Summoned outside the Hog's Head in an attempt to convince the Death Eaters who had seen Harry's Patronus that they really saw a goat.
Albus Dumbledore	Phoenix	His magical familiar, Fawkes, was a phoenix. Also he used it in 1995 as a message to Hagrid when Krum was stunned. It was described as "a ghostly bird that flew off in the direction of Hagrid's house".
Andros the Invincible	Something allegedly the size of a giant (possibly an actual giant)	Stated on his Chocolate Frog Card as the only wizard to make a Patronus that size.
Arthur Weasley	Weasel	First seen when he sent a message about Rufus Scrimgeour's arrival on Harry's seventeenth birthday. Later seen when Arthur sent a Patronus to 12 Grimmauld Place to inform Harry, Ron and Hermione that the Weasley family was safe.
Cho Chang	Swan	Seen in the last Dumbledore's Army meeting in 1996.
Dolores Umbridge	Cat	While interrogating Muggle-borns at a trial, she had cast a Patronus to ward the Dementors from the prosecutors. Her favourite animal, as shown by the many plates with cats on them in her office. She was able to cast the Patronus due to her affinity with the locket Horcrux's evil influence.
Ernie Macmillan	Boar	Seen in the Battle of Hogwarts in 1998.
Flavius Belby	"Something with horns"	In Fantastic Beasts and Where to Find Them, he stated he cast off a Lethifold by performing the Patronus Charm. It says the Lethifold was thrown into the air on the horns of his Patronus.
Ginny Weasley	Horse[7]	Seen in the last Dumbledore's Army meeting in 1996.
Harry Potter	Stag	Harry's Patronus is in the shape of his father's Animagus form and Patronus. He learned how to conjure a Patronus at an exceptionally young age.
Hermione Granger	Otter	Seen in the last Dumbledore's Army meeting in 1996. It is apparently the only spell Hermione has trouble with, as said in 1998 while escaping from the Ministry of Magic.
James Potter	Stag	James' Animagus form was also that of a stag.
Kingsley Shacklebolt	Lynx	Seen in 1997 when he warned the Order during Bill and Fleur's wedding of the downfall of the Ministry of Magic and Rufus Scrimgeour's death.
Lily Potter	Doe	Mentioned in conjunction with Snape's Patronus. It was also the female form of her husband's Patronus.
Luna Lovegood	Hare[8]	Seen in the last Dumbledore's Army meeting in 1996 and in the Battle of Hogwarts in 1998.
Minerva McGonagall	Cat	Just before the Battle of Hogwarts, she sent her Patronus out to alert the other Heads of House that Hogwarts Castle would soon be under attack by Lord Voldemort and his followers.
Nymphadora Tonks	Werewolf (previous Patronus unknown)	The form of Tonks' Patronus changed in 1996. It became a werewolf due to her love for Remus Lupin, though Harry Potter and Hermione Granger initially believed it was a black dog, triggered by the death of her second cousin Sirius Black (whose Animagus form was a black dog). Changes of Patronus are rare and usually caused by devastating life traumas. Occasionally when a witch and a wizard are married, their Patronuses will match each other (most likely because the witch/wizard's happy thought will be that of their spouse).
Ron Weasley	Jack Russell Terrier[9]	Seen in the last Dumbledore's Army meeting in 1996 and in the Battle of Hogwarts in 1998.
Seamus Finnigan	Fox	He could not yet produce a fully formed (corporeal) Patronus in Dumbledore's Army, though in the Battle of Hogwarts in 1998, he managed a Patronus in the shape of a fox.
Severus Snape	Doe	Acted as Harry's guide through the woods to where Godric Gryffindor's Sword was hidden. Snape's Patronus mirrored Lily's due to his unspoken love for her that began when they were small children.

Behind the scenesEdit

• Both the Patronuses of James Potter and Minerva McGonagall match their respective Animagi form. These are the only characters whose Patronus and Animagus forms are known. It is uncertain whether all Patronuses will match the form of the Animagus, but so far, an instance of differing forms has not been revealed.
• In the first chapter of Harry Potter and the Deathly Hallows, a white peacock appears in the gardens of Malfoy Manor. Some fans believed this bird to be Lucius Malfoy's Patronus. However, J. K. Rowling stated that no Death Eater except Severus Snape could conjure a Patronus.^[10] This means that the peacock was in fact a living creature. It is stated in Harry Potter and the Deathly Hallows that the creature was in fact an albino peacock.
• In the video game adaptation of Harry Potter and the Prisoner of Azkaban, the more moderate Expecto Patronum is a ball of light (before cast, a white ring goes up Harry's arm and if it reaches top of the wand, Harry has to try the spell again) and is used only to attack Dementors. At the climax of the game, a stag (Harry's Patronus) jumps out of the wand to drive away all the Dementors nearby attacking Harry and Sirius.
• In the said video game, the first video game adaption of Harry Potter and the Deathly Hallows, LEGO Harry Potter: Years 1-4 and LEGO Harry Potter: Years 5-7 the Patronus Charm appears to push the Dementors away with the first shot and a second shot kills them.
• The lecture that Harry gives on Patronuses to Dumbledore's Army in the film version of Harry Potter and the Order of the Phoenix is extremely similar to the lecture Remus Lupin gave him in the film version of Harry Potter and the Prisoner of Azkaban.
• In Harry Potter and the Deathly Hallows: Part 1, Dolores Umbridge's Patronus seems to emanate a shield that keeps the Dementors separated from everyone in the courtroom. In addition, Kingsley Shacklebolt's Patronus is described in the novel as taking the form of a lynx, however in the film it is depicted as a shimmering comet of light from which springs silvery images of witches and wizards screaming in terror as Kingsley's voice details the death of Scrimgeour and the fall of the Ministry.
• In LEGO Harry Potter: Years 1-4, Voldemort, Lucius Malfoy, Walden Macnair, Barty Crouch Jr., and an unnamed Death Eater can all cast the spell, despite the fact that Rowling stated that no Death Eater besides Severus Snape could produce a Patronus.
• According to W.O.M.B.A.T., it is possible that Patronuses vary in strength according to which animal's form they take.
• The Patronus spellbook, owned by Remus Lupin, includes information and instruction on the Patronus Charm.
• In an interview, J. K. Rowling stated that the happy memory that would produce the strongest Patronus for her would be the births of any of her three children, though a close fourth would be when she learned that Harry Potter and the Philosopher's Stone was going to be published.^[11] She has also stated that she'd like for her patronus to be an otter, like Hermione's, but she has a feeling it might actually be a large dog.^[10]
• Although Lupin provides most of the information within the books about the Patronus Charm, but his Patronus is never identified.

Patronuses in the filmsEdit

• In the film adaptation of Harry Potter and the Order of the Phoenix, his Patronus physically attacks the Dementors by charging at them, as depicted in the books. Also, Patronuses produced by the members of Dumbledore's Army make noises and are capable of interacting with physical objects, such as Ron's dog Patronus knocking over Neville Longbottom.
• There was a noted change in appearance of Patronuses in general in the Order of the Phoenix movie. In movies 5-8, Patronuses very wispy and airy, while in the third film they looks more substantial, solid and brighter.
• In Harry Potter and the Deathly Hallows: Part 1, during the infiltration of the Ministry of Magic, Umbridge's Patronus was very clearly seen several times in the same scene and often looked less like a cat and more like a reanimated, feline corpse, with the skeletal features visible. This is odd for a Patronus (they usually looks quite "alive" and well) and its twisted form may be a nod to both Umbridge's nature and the circumstances under which it was cast.
• In the film adaption of Harry Potter and the Prisoner of Azkaban, the Patronus in its powerful wave-like form emits a deep reverberating sound. In Harry Potter and the Deathly Hallows: Part 2 this effect was also used when Aberforth Dumbledore protected Hogwarts from Dementors.

AppearancesEdit

• Harry Potter and the Prisoner of Azkaban (First appearance)
• Harry Potter and the Prisoner of Azkaban (film)
• Harry Potter and the Prisoner of Azkaban (video game)
• Harry Potter and the Goblet of Fire
• Harry Potter and the Goblet of Fire (film) (Disc 2)
• Harry Potter and the Order of the Phoenix
• Harry Potter and the Order of the Phoenix (film)
• Harry Potter and the Order of the Phoenix (video game)
• Harry Potter and the Half-Blood Prince
• Harry Potter and the Half-Blood Prince (video game) (IPhone version only)
• Harry Potter and the Deathly Hallows
• Harry Potter and the Deathly Hallows: Part 1
• Harry Potter and the Deathly Hallows: Part 1 (video game)
• Harry Potter and the Deathly Hallows: Part 2
• Harry Potter and the Deathly Hallows: Part 2 (video game) (Cutscenes only)
• LEGO Harry Potter: Years 1-4
• LEGO Harry Potter: Years 5-7
• Harry Potter: Spells

Notes and referencesEdit

Defence Against the Dark Arts (D.A.D.A.)
Professors: Galatea Merrythought · Quirinus Quirrell · Gilderoy Lockhart · Remus Lupin · Barty Crouch Jr. (as Alastor Moody) · Dolores Umbridge · Severus Snape · Amycus Carrow
Textbooks: The Dark Forces: A Guide to Self-Protection · Break with a Banshee · Gadding with Ghouls · Holidays with Hags · Travels with Trolls · Voyages with Vampires · Wanderings with Werewolves · Year with the Yeti · Defensive Magical Theory · Confronting the Faceless
D.A.D.A. at Hogwarts: Classroom 3C · Temporary Classroom · Tower · Professor's Office · Storeroom · Staircase · Lesson Cup · Race Cup · Dumbledore's Army
Spells covered under the subject: Curse of the Bogies · Knockback Jinx · Verdimillious (uno, duo & tria) · Wand-Lighting Charm · Glacius · Patronus Charm · Killing Curse · Cruciatus Curse · Imperius Curse · Impediment Jinx · Reductor Curse · Stunning Spell · Shield Charm · Nonverbal spells · Inferius
Creatures covered under the subject: Vampire bats · Iguanas · Cornish Pixies · Werewolves · Vampires · Hinkypunks · Boggarts · Red Caps · Kappas · Grindylows