According to a 2004 interview, Harry Potter author J.K. Rowling revealed that the killing curse "avada kedavra" comes from abracadabra.
Avada Kedavra
According to Rowling, its root is actually Aramaic and derives from the original "abracadabra," which means "let the thing to be destroyed." In this case, the thing is a person. Scary stuff. Consider your Harry Potter buzz officially killed.
Herpo the Foul, one of the first Dark wizards, the first person to create a Horcrux and hatch a basilisk egg, created the Unforgivable Curses.
Does anyone know where avada kedavra came from? It is an ancient spell in Aramaic, and it is the original of abracadabra, which means 'let the thing be destroyed. ' Originally, it was used to cure illness and the 'thing' was the illness, but I decided to make it the 'thing' as in the person standing in front of me.
Throughout the Harry Potter series, the titular hero never used the Killing Curse for several reasons. Avada Kedavra was Lord Voldemort's signature spell. In fact, the Dark Lord directly killed multiple notable figures, including Harry's parents Lily and James Potter, with the Killing Curse.
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.
Why is Avada Kedavra considered unblockable in Harry Potter? It was so because the curse was one of the unforgivable curses and there are no ways of stopping it coming to you.
Its incantation is Avada Kedavra. The only known counter-spell is sacrificial protection, which uses the magic of love.
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."
While during the Second Wizarding War, Lord Voldemort made the curses legal, they became illegal once again by the 1990s. Anyone using this spell on another human being would be sentenced to life in Azkaban, Harry Potter's prison for the most dangerous criminals.
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.
Expelliarmus did not beat Avada Kedavra. Voldemort's wand (the elder wand) recognized its true master (that was Harry) and refused to attack it. In a way Voldemort killed himself as his own spell backfired on him.
In the Goblet of Fire book, the Avada Kedavra is described as unblockable. However, in the Deathly Hallows movie, Hermione blocks an Avada Kedavra curse aimed at her.
Avada Kedavra - Used 8 times.
Avada Kedavra is the worst of these curses, as it is used to end the life of an opponent. It is common to see this curse used by the Death Eaters and by “He Who Must Not Be Named.” This spell is based on the Aramaic, meaning "disappear like this word."
We know that they did not use Avada Kedavra.
And while many fan-favorite characters have fallen victim to the Killing Curse, one surprising figure working at Hogwarts School of Witchcraft and Wizardry may possess limited immunity from the spell's full, lethal effects: Rubeus Hagrid.
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 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.
Voldemort intentionally made six Horcruxes, but when he used Avada Kedavra on Harry, he unintentionally created a seventh Horcrux. Instead of dying, Lily's love for Harry created a counter 'curse' known as Sacrificial Protection and saved Harry.
Narcissa's greatest moment, however, was when she chose to betray Voldemort in Harry Potter and the Deathly Hallows. Not knowing whether Draco was alive or dead, Narcissa chose to lie to the Dark Lord rather than risk losing her son.
Only love itself, the strongest magic of all, can block the Killing Curse. Lord Voldemort cast this spell constantly in his lifetime, and it's the spell that killed Harry's parents in particular.