Snape successfully casting Avada Kedavra against Dumbledore is a powerful, overlooked piece of magic.
In order to conjure the avada kedavra curse, you have to want to kill your victim. We all know that Voldemort could easily kill a child without an ounce of remorse... but not Snape. Snape didn't want to kill Dumbledore, and this was why the spell was blue instead of the usual green.
Voldemort thought Snape was the owner of the Elder Wand. Using Avada Kedavra while the Elder Wand was resisting Voldemort was already a risky business, but using it against the true owner would be suicide (as Voldemort would find out when he used the Elder Wand against its true owner: Harry).
When Snape killed Dumbledore. In probably the most shocking twist of the series, Snape cast the unforgivable Avada Kedavra curse on Hogwarts' beloved headmaster.
Potterheads will recall that Dumbledore was killed by Snape during the Battle of the Astronomy Tower. Dumbledore falls to his death (Credit: Warner Bros.) The Half-Blood Prince used the killing curse, Avada Kedavra, to finish off the former headmaster of Hogwarts once and for all.
Though Harry encountered many opportunities that deemed Avada Kedavra necessary, it remains as one of the Unforgivable Curses Harry Potter never cast. For one, he viewed the spell as an immoral practice commonly used by users of the Dark Arts.
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.
Erroneously believing Snape is the master of the Elder Wand and that Snape's death will make him the master of the Wand, Voldemort kills Snape by having his pet snake Nagini bite him through the neck.
Sectumsempra
This curse was created by Professor Severus Snape when he was a young man. This dark spell leaves cuts on your victim that may never heal.
Hermione's bluebell flames
Hermione first uses it against Snape when she and Ron think he is cursing Harry's broom in his first Quidditch match. Her bright blue flames set Snape's robes alight, before Hermione scoops them up and puts them into a jar.
Because he didn't believe disarming him would be enough. After Dumbledore was dead, Voldemort would have been told everything. Including the fact that Draco disarmed Dumbledore. But all he cared about was who KILLED Dumbledore.
In the books, Deathly Hallows introduced that a Taboo curse was placed on Voldemort's name. The curse made it possible for anyone who said his name to instantly be located by the Death Eaters, giving them the ability to find whoever said it.
Simple answer: NO. Explanation: Avada kedavra could only kill living creatures, and since dementors aren't living beings, so therefore they couldn't be killed by this spell. The form of dementors aint described in any of books by Rowling, yet its obvious that they could be anything but a human.
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 the intention of using it against his enemies, and it soon became one of his specialties.
Severus Snape is one of the most divisive characters in the entire "Harry Potter" series. He was a double agent, so many character details were kept a secret. His mother was a witch and his father was a Muggle, leading to the moniker "The Half-Blood Prince."
In the first movie the the scene of the troll you can see that snape has a bleeding leg, why? Snape was bitten by Fluffy the three headed dog. When Troll was released, he went to make sure that no one was after the stone as everyone was distracted by the troll.
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.
Avada Kedavra
It's used to kill people, it's an Unforgivable Curse, and it was Voldemort's favourite, so it's going last.
Firestorm. Firestorm was a spell that created a large ring of fire around the caster's wand. This spell is one of the last and most powerful spells that Albus Dumbledore cast using the elder wand before his death.
Harry's scar had hurt during Arrival Feast because of Quirrell's connection to Voldemort; Snape was then talking to Quirrell, allowing Voldemort, from the back of Quirrell's head, to sense Harry's presence.
The three Unforgivable Curses in Harry Potter are Crucio, Imperio, and Avada Kedavra, and all three are available to Hogwarts Legacy players. Crucio subjects the victim to extreme torture, while Imperio puts them under the control of the spellcaster.
Harry makes use of two of the Unforgivable Curses in the books. Dueling with Bellatrix Lestrange, he attempts the Cruciatus curse, with limited results; Bellatrix says that he has to really hate someone to make the Unforgivable Curses work properly, righteous indignation isn't enough.
Alohomora, which is a spell that unlocks objects (and it's also Hermine Granger's signature spell).