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.
An enraged Molly Weasley engages Bellatrix in a duel and fires a curse that hits Bellatrix right over the heart, killing her.
No, we don't know what spell did Molly use to take down Bellatrix, but it certainly wasn't Avada Kedavra.
Molly froze Bellatrix's body and then performed a powerful enough Reducto spell to completely disintegrate Bellatrix. The female Weasleys are gifted spell casters.
We know that they did not use Avada Kedavra. Aveda Kedavra has one effect: it kills. Other curses can be just as lethal.
Cruciatus Curse ('Crucio')
Harry tried to use this spell himself. The first time was against Bellatrix after she had killed Sirius. His attempt was unsuccessful because, as Bellatrix mockingly explained: 'You need to really want to cause pain – to enjoy it – righteous anger won't hurt me for long…'
History Of Avada Kedavra
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.
5 Bellatrix Lestrange: The Cruciatus Curse.
But when Ron and Hermione are about to die by Nagini, Ron casts the killing curse as a last resort and it simply rebounds off Nagini as it was nothing.
Death Eater Bellatrix Lestrange was a well known practitioner of the Cruciatus Curse, where she would torture numerous victims to her immense satisfaction; thus this curse could be assumed to be her signature spell.
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.
Its incantation is Avada Kedavra. The only known counter-spell is sacrificial protection, which uses the magic of love.
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.
His reaction to Bella's death was akin to his reaction at the loss of the Cup, which was when he realised that his own immortality was jeopardised amidst war and his own death could have been near.
"The Lestranges should be here," said Voldemort quietly. In short Lord Voldemort was the sperm donor for the Lestranges as Bella's husband Rodolphus Lestrange was firing blanks. Hence why they had no child so Lord Voldemort said he would father a child with Bellatrix to help out his best deatheater friends.
Draco's refusal to reveal Harry's identity to Bellatrix was not because he liked him. It was because he believed that Harry was the only chance they had at defeating Voldemort. At first, Draco admired and revered Voldemort until he threatened his family's safety.
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.
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.
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.
Narcissa the devoted mother
If Bellatrix managed to muster affection for anyone other than Voldemort, it was her younger sister (even at the height of the Second Wizarding War, Bellatrix and Narcissa called each other Cissy and Bella, no doubt childhood nicknames they'd given each other).
She was remorseless and was cackling in glee after she had murdered Sirius. Bellatrix couldn't stop raving about it and showed it by singing “I killed Sirius Black” multiple times.
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.
Avada Kedavra meaning
Rowling claims she created this spell out of a popular “Abra-Kadabra” saying in Aramaic which means “Let the thing be destroyed”.
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.