Riddikulus Riddikulus is the spell that's used when facing a Boggart, and it's used to turn the Boggart into something that the caster finds funny.
In Harry Potter, Riddikulus is a spell used against Boggarts. For the magic to work, you have to think of something funny while casting it. If it works, it makes the boggart take the shape of whatever you were thinking of and because Boggarts feed on fear, they're defeated by laughter.
Avada Kedavra
Topping the list for the most powerful spells in the Harry Potter universe is no other than Avada Kedavra, Voldemort's favorite to instill his will and fear onto others. The spell itself is a play on Abra Kadabra and is easy to cast by just about anyone in the Wizarding World.
The darkest of the Dark Arts, Harry Potter unforgivable curses are the Cruciatus Curse, the Imperius Curse, and the Killing Curse. Although the curses are highly illegal, Harry using Unforgivable Curses happened, but he uses them once he was thrust into the Second Wizarding War.
Riddikulus
Riddikulus is the spell that's used when facing a Boggart, and it's used to turn the Boggart into something that the caster finds funny.
He recites: "Sunshine, daisies, butter mellow, turn this stupid, fat rat yellow." Unfortunately for Ron, the rat doesn't turn yellow and Hermione instantly shows him up by magically repairing Harry's glasses.
The Eradication Spell (Deletrius) was a charm that could disintegrate certain objects and served as the counter-charm to the Reverse Spell, vanishing the shadow emitted from the wand.
Therefore, figuring out a spell that is Draco's favorite is hard and, in the movies, there is no defining moment that cements a spell as his favorite. Based on Harry Potter lore, and an article by The Healthy Journal, Draco's signature spell is a N.E.W.T standard spell, The Protean Charm.
Widogast's Transmogrification
This spell was first created by Essek Thelyss and Caleb Widogast, using notes from the archmage Halas, in an attempt to return Nott into her true body once and for all. Therefore, the spell's use is to transform a (humanoid) creature's body into another (humanoid) body permanently.
Levicorpus is the incantation of a jinx that can be used to lift the victim into the air by their ankle. It is essential that the spell be performed non-verbally.
Harry became so enamoured with the spell that he eventually used it to finish off Lord Voldemort. Here's how Harry's relationship with Expelliarmus became his signature – and why that's a good and bad thing.
I've always suspected Molly's lethal spell was a particularly well-placed and powerful stunner that stops Bellatrix's heart, which is consistent with the description of her death: Molly's curse soared beneath Bellatrix's outstretched arm and hit her squarely in the chest, directly over her heart.
The Imperius Curse, or Imperio, is one of the three Unforgivable Curses, the three spells, Avada Kedavra, Imperius, and Cruciatus all feature in Hogwarts Legacy.
Ginny and the Bat Bogey Hex
As the youngest Weasley, we're sure Ginny observed more than her fair share of unpleasant spells over the years but it was the Bat Bogey Hex she was famous for – and with good reason.
Ginny was proficient at charms and curses, capable of holding her own against Death Eaters, including helping Hermione and Luna Lovegood to duel Bellatrix Lestrange. She was even able to cast a full-bodied Patronus, taking the form of a horse and is considered an extremely advanced spell.
Expulsion was never seen in the movies, but a very similar spell known as Bombarda Maxima was. It is the most powerful form of explosive enchantment, that causes large explosions powerful enough to tear down walls.
Voldemort killed Snape in Harry Potter And The Deathly Hallows Part 2 using his Horcrux snake Nagini instead of his favorite Unforgivable Curse, Avada Kedavra.
Snape used the Avada Kedavra curse to kill Albus Dumbledore.
In the Harry Potter series, Bellatrix Lestrange used the spell "Avada Kedavra" to kill Sirius Black.
Alohomora, which is a spell that unlocks objects (and it's also Hermine Granger's signature spell).
Her sacrifice gave Harry the power of love, a protection spell sealed with the blood spilled by her death.
Avada Kedavra
It's used to kill people, it's an Unforgivable Curse, and it was Voldemort's favourite, so it's going last.
Snape save Draco by using Vulnera Sanentur spell. Sectumsempra is a curse invented by Professor Severus Snape, during his childhood, when he was known as "The Half-Blood Prince. He created it with intentions of using it against his enemies and it soon became one of his specialties."
It's unknown quite how they managed this, although we do know that certain spells do levitate things, such as the Levitation Charm, or Snape's self-penned spell, Levicorpus.