Extended Description. The three curses that are classified as Unforgivable are the Imperius Curse, the Cruciatus Curse, and the Killing Curse. Mad-Eye Moody introduces Harry and his class to these curses in Harry Potter and the Goblet of Fire.
They are the Killing Curse, Avada Kedavra, the Cruciatus Curse, Crucio, and the Imperius Curse, Imperio.
1. Avada Kedavra. No prizes for guessing that the deadliest of them all would be this one. Avada Kedavra, or the Killing curse, is another Unforgivable curse, the most dangerous one ever.
Well, you'll be glad to know that you have the option to learn three of the most powerful dark spells in the wizarding world – also known as the Unforgivable Curses: Crucio, Imperio, and Avada Kedavra.
In Harry Potter and the Order of the Phoenix, Harry attempts to use the Cruciatus Curse against Bellatrix Lestrange, in self-defense, but fails.
Voldemort's signature spell was Avada Kedavra. Harry's was Expelliarmus.
Avada Kedavra
It's used to kill people, it's an Unforgivable Curse, and it was Voldemort's favourite, so it's going last.
The spell that Dolohov hit Hermione with was actually purple: But the Death Eater Hermione had just struck dumb made a sudden slashing movement with his wand; a streak of what looked like purple flame passed right across Hermione's chest.
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.
A single 12th-level D&D spell existed, and it resulted in the destruction of Netheril. Karsus' avatar was a spell that allowed the caster to turn into a god. Karsus used this to usurp the position of Mystryl, the goddess of magic.
Malfoy spots Harry and casts a Cruciatus curse; Harry, defending himself, using the Half-Blood Prince's Sectumsempra spell without knowing its effects. To his horror, it gashes Draco's face and chest, spilling his blood everywhere. Moaning Myrtle flies off, screaming.
If you decide against learning Avada Kedavra from Sebastian, that's not the last chance you'll get to learn or use the spell. Once you return to the castle, you can visit Sebastian in the Undercroft in the Defence Against the Dark Arts tower, and ask to learn about it.
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.
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.
The bond between Harry and Hedwig was so strong that she even accompanied him during the Battle of the Seven Potters, and died when struck by the killing curse – in the book, she was in her cage, while in Harry Potter and the Deathly Hallows – Part 1, she flew directly at the face of a Death Eater to protect Harry and ...
But, then, it's pretty dramatic to go and have the woman (and her family) slaughtered. Family drama aside, DAMN. This means ARGUS FILCH KILLED HERMIONE'S MOM!
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.
Voldemort's greatest fear is death and as a result a boggart takes the form of his own corpse. It is unsurprising that this is Voldemort's biggest fear. After all, he did split his soul up encasing it in various horcruxes just so to keep himself from dying.
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.
Alohomora, which is a spell that unlocks objects (and it's also Hermine Granger's signature spell).
In Rowling's Harry Potter series, Dumbledore demonstrated the ability to possess wandless magic on several occasions, most memorably when he cast Aresto Momentum without a wand to save Harry from falling to his death during a Quidditch match.
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.