We haven't witnessed any Auror or Order members utilizing Avada Kedavra at previous times. Dumbledore despised combating violence with violence. As a result, no. Nobody is permitted to utilize avafa kedavra.
Snape's euthanasia of Dumbledore is the sole unambiguous canon case of a good wizard employing Avada Kedavra to murder. Molly Weasley kills Bellatrix Lestrange in Deathly Hallows with an unknown spell that hits her in the chest – probably a well-placed stunner. Aveda Kedavra has only one effect: it is lethal. There are no other details about its use on screen or in print.
In Harry Potter and the Goblet of Fire, Mad-Eye Moody tells Harry that he was able to avoid death once, when he was younger than Harry is now. When asked how he did it, he says "I used my magic." It is not clear if this means that he used Avada Kedavra or some other spell, but we can assume that it was another magical accomplishment since he later adds that it wasn't very wise of him. .
In addition to killing Snape, Dumbledore also casts Avada Kedavra on Wormtail twice, once while they were both alive and again after Dumbledore is killed. The first time, it has no effect; perhaps because Wormtail had already betrayed Dumbledore and so could not be trusted. But the second time proves more fatal as it causes Dumbledore's body to disappear in a flash of blue light.
It is possible that other good wizards have used Avada Kedavra in secret or under circumstances where explaining themselves would have been dangerous.
How Come Harry Didn't Cast Avada Kedavra? For a variety of reasons, the titular figure never employs the Killing Curse throughout the Harry Potter books. Lord Voldemort's hallmark spell was Avada Kedavra. Harry refused to descend to that degree of violence because Voldemort, like the Killing Curse, represented the pinnacle of evil. Instead, through most of the series, he uses various forms of magic to defeat Voldemort's followers.
In addition to this, there are times when it is suggested that Harry could have used the curse but chooses not to. For example, in Goblet of Fire, when asked by Ron if he will use Avada Kedavra on Padfoot, the dog who attacks him near the end of the book, Harry replies "No" and then adds "But I could."
This does not mean that he cannot use the curse at any time in future books. He may decide to cast it once he reaches adulthood and can make his own choices rather than follow Voldemort's orders. Or perhaps he will be forced to use the curse against someone very close to him (like Dumbledore) and find another way to deal with the situation.
She didn't in the novel, but it was a greater Stupefy in the film. It is unknown what curse she invoked, but it was not Avada Kedavra. It is very evident in the literature that there are other ways to magically murder someone; it occurs twice: with Sirus and Bellatrix.
In both cases, Stunning them gives her time to find another way to kill them. This proves that killing people with Avada Kedavra isn't the only way to die.
A living target is required for Avada Kedavra to murder. If the spell hits something other than a live target, an explosion or green flames may occur. This means that the Voldemort parts in the Diary, Ring, Cup, Diadem, and Locket cannot be slain by the Killing curse. However, given time and access to other means of killing his body parts, they could be killed otherwise.
Voldemort was born with a rare genetic disorder called Pelger-Hubert Syndrome (PHS). This condition causes physical abnormalities and can lead to mental illness as well. Such as Voldemort's case of schizophrenia when he was young. PHS is also what caused Voldemort's mother to die during childbirth. He also suffered from another condition called Silver-Sullivans Disease which caused his bones to grow very quickly at a young age so he could not join the Dark Lord Army until after his seventeenth birthday.
Voldemort used a Cruciatus Curse on Harry Potter during the Battle of Hogwarts. This allowed him to torture Harry mentally instead of physically. So it can be assumed that this spell is capable of killing Voldemort's Horcruxes. However, since it was a cursed spell, it may not work. Also, since we do not know what happened to Voldemort after this incident, such as if he died or not, it can only be speculated that he survived.
Avada Kedavra, widely known as the Killing Curse in Harry Potter, kills a person quickly and without harm. It has no antidote, and only one person, Harry Potter, has ever survived it.
In order to kill someone with Avada Kedavra, you have to be able to see them. This means that the victim cannot wear any kind of cloak or dress up in disguise. They also need to be facing you when you cast the spell. You can tell if they are facing you because they will then twitch their nose and sneeze. This is because you have touched them on the chest area where they keep their heart. Once you have seen to their satisfaction that they are not wearing anything over their skin, held in place by something else (such as a garment), you can then kill them with Avada Kedavra.
When Voldemort tried to kill Harry Potter with this curse, he made a mistake by not being careful who he chose. Although nobody has ever survived it before, there is now hope for some survivors as well as a way to help those who suffer from its effects.
Harry's hallmark spell is the disarming charm, and he has a lot of practice with it. He, on the other hand, has never employed Avada Kedavra, much less in a battle situation. Even if he could get the curse to work, there is no way he could survive one enough to feel its effect.
Avada Kedavra is a powerful curse that requires an extremely strong mind to use. It can only be cast by a Death Eater who has committed themselves to destroying life as they know it. They must have total faith in its power because it requires them to sacrifice part of their soul in order to employ it. If they can't do this, then it isn't worth casting so they can fail. However, those who can master this curse are able to kill even the most powerful wizard or witch alive today. No one is safe from its reach.
In order for Harry to die through the use of Avada Kedavra, a Death Eater would have to possess his body in addition to his mind. This could either be another Death Eater or even Voldemort himself. The fact that no one has ever successfully used this curse against Harry means that it is too dangerous for anyone else to attempt either.
You can't hurt them or knock them over easily with magic. Does canon have any mention of Avada Kedavra being able to kill giants? Not at all. It has a short incantation, powerful effect, and doesn't kill the victim. That's all that's needed to make something "canon".
Giants were already extinct when Harry Potter was born. He would have been too young to remember them. However, they are mentioned several times in the books by other people who had never heard of them before.
Giant spiders appear in Chapter 12 of Harry Potter and the Deathly Hallows. They attack Hogwarts during the Battle of Hogwarts between the Order of the Phoenix and the Ministry of Magic. The giant spiders' bites are fatal to humans but not to wizards or magical creatures such as Dementors. This might be an example of Avada Kedavra working for the Giants since it killed those human beings who were attacking witches and wizards with toxic magic.
In conclusion, Avada Kedavra works for the Giant Spiders in this story.