Avada Kedavra has only one purpose: to kill. However, it's not the only curse that can be lethal. Stunners can be lethal, for instance — particularly if someone takes multiple stunners or one is a direct hit over the heart.
She most definitely used Expulsa. It's said that it was a powerful Stupefying spell, but that would just put the opponent to sleep for a longer time than a Stupefying spell from a 1st year. I don't know why people think it was Avada Kedavra or why they are saying that it's not a known spell.
Molly didn't use that spell to get rid of Bellatrix, she used a combination of defensive spells that had the same effect. The Avada Kadavra spell is Dark magic designed to kill another. In order to use that spell a witch or wizard must have malice in their heart.
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.
Molly Weasley isn't stronger than Bellatrix.
McGonagall is easily one of the most powerful magic users in Harry Potter, a devastatingly powerful duelist who even took on Voldemort himself during the Battle of Hogwarts. The most complex and difficult spells are easy for her, and she's even tougher than she looks.
Bill Weasley
The eldest sibling of the Weasley family, Bill was older and more powerful than most of the brood. The profession of his choosing was one of the most challenging and dangerous ones — Curse Breaking required courage, magical know-how, and resilience like no other.
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.
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.
Draco Malfoy (Cruciatus and Imperius Curses)
He's never seen using the Killing Curse, but under strict orders from Voldemort, he's known to have used the other two.
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.
One of the most noticeable was Julie Walters, who played Molly Weasley throughout the entire film series. As it turns out, her absence in the special is most likely part of her semiretirement from acting.
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.
Some would say there's no spell worse than Avada Kedavra, the Killing Curse that Voldemort used so indiscriminately. But it's definitely not the wizarding world's only Unforgivable Curse.
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.
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.
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.
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.
The Imperius Curse, or Imperio, is one of the three Unforgivable Curses, the three spells, Avada Kedavra, Imperius, and Cruciatus all feature in Hogwarts Legacy.
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.
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.
In the novel, the duel between McGonagall and Snape plays out somewhat differently; she did use fire at one point in their duel, though it was through using the fire from burning torches along the walls, not through conjuring flames from her wand.
Verdict: Ginny almost makes it to the top of the Weasley rankings for coolness. She trained herself at Quidditch when her brothers never let her play, she had the meanest Bat Bogey Hex around (and wasn't afraid to use it), and continued to cause havoc at Hogwarts to rebel against the Death Eaters in Deathly Hallows.
Ron Weasley
He was quick to defend Harry and Hermione, even if it meant that his own life was in danger. Ron had a tough life, but he still managed to find the shining, golden moments in it which made him the most loved Weasley family member.
She has many children and even though Ginny is her only daughter and could easily be her favorite, Molly claims she has no favorite child.