Some would say there's no spell worse than Avada Kedavra, the Killing Curse that Voldemort used so indiscriminately.
Expelliarmus: Harry Potter's Signature Spell | Wizarding World.
Avada Kedavra
It's used to kill people, it's an Unforgivable Curse, and it was Voldemort's favourite, so it's going last.
Alohomora, which is a spell that unlocks objects (and it's also Hermine Granger's signature spell).
What Is Dumbledore signature spell? There were two; Apparation and Invisibility. Dumbledore must have used these particular skills thousands of time in his lifetime for any number of purposes. His vast gathering of knowledge probably came as a result of his skill in appearing and disappearing at will and unseen.
Expelliarmus. The Disarming Charm, as the name implies, enables the user to disarm another wizard or witch in a duel by forcing their wand out of their hand. ...
Sectumsempra was a curse invented by Professor Severus Snape that lacerates the target and causes severe haemorrhaging. Snape created it as a student of Hogwarts, with the intention of using it against his enemies, likely including the Marauders, and it became one of his specialities.
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.
Ginevra Weasley was well-known for her ability to cast a particularly potent Bat-Bogey Hex, which could be considered her signature spell as she used it several times on people who annoyed her and was referred as "an accomplished caster" of the spell.
One of the charms he uses is the protean charm which we are told in Harry Potter And The Order Of The Phoenix is a N.E.W.T standard spell. Draco's ability to master high-level charms outside of his current teaching level suggests he also has more powerful abilities than many will think.
Wingardium Leviosa! Harry Potter mastered the levitation charm in his first year at Hogwarts School of Witchcraft and Wizardry.
The three Unforgivable Curses are the Cruciatus Curse, which causes unbearable pain; the Imperius Curse, which allows the user to control the actions of the victim; and the Killing Curse, which causes instant death.
The least-used spell: Waddiwasi, used in Harry Potter and the Prisoner of Azkaban, which is “the incantation of a charm that can be used to shoot a small, soft mass of whatever the caster so desires at the target or victim,” according to the Harry Potter Wiki.
Avada Kedavra, also known as the Killing Curse, kills a person instantaneously and without injury. There is no countercurse for it, and only one person, Harry Potter, has ever survived it.
Confringo. Commonly known as the Blasting Curse, Confringo causes the target to explode. To make it even more dangerous, it produces flames that ignite upon contact with the target. If Confringo fails to kill the target immediately, they will instead suffer a slow and painful death.
In the books it is revealed that Harry Potter got the scar when he was attacked by Voldemort, who had just murdered his parents. Voldemort launched the killing curse "Avada Kedavra" at baby Potter but the spell rebounded. It was the only time someone had been hit in the face by the curse and survived.
"Expelliarmus" is one of the best spells in Harry Potter, and it is Harry's signature spell.
The Killing Curse was created in the early Middle Ages by Dark witches and wizards. Primarily, the curse was used to quickly slay opponents during a duel. In 1707, the Wizards' Council was restructured into the Ministry of Magic, which allowed for more strict restrictions on certain types of magic.
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."
Vulnera Sanentur was the song-like incantation of a healing spell and counter-curse to the Sectumsempra Spell, which was invented by Severus Snape.
Draco doesn't speak in the movies until he meets Harry at Hogwarts. Just before the Sorting Ceremony, he says to Harry, "It's true, then. What they're saying on the train. Harry Potter has come to Hogwarts."
Stupefy since he used it during the fight in the Department of Mysteries or Wingardium Leviosa since he used it to defeat the troll in the girls' bathroom in the first book.