Can any wizard cast Avada Kedavra?

It depends on a persons willingness to kill someone and also the power behind the wand. To quote Barty Crouch/Mad-Eye Moody in ‘Harry Potter and the Goblet of Fire’, “Avada Kadavra is a curse that needs a powerful bit of magic behind it.

Does the Killing Curse have to be spoken?

NO. The ability to perform a non-verbal curse comes from the magical ability of the wizard himself. The same is the case with wandless magic. Strong wizards like Dumbledore and Voldemort can perform spells like the sheilding charm, the disarming spell or the full-body-bind curse non-verbally.

What happens when you cast The Killing Curse?

When cast successfully on a living person or creature, the curse caused instantaneous and painless death, without causing any injury to the body, and without any trace of violence. The Killing Curse was accompanied by a blinding flash or jet of green light and a rushing sound when being cast.

Can the Killing Curse be dodging or blocked?

The Killing Curse could be dodged or physically blocked by an object, such as the statues Dumbledore animated to protect Harry Potter during his duel with Voldemort after the Battle of the Department of Mysteries. The Killing Curse was known to be unblockable, as once it stroke the living victim, it almost always resulted in immediate death.

Did anyone ever use the Killing Curse in Harry Potter?

Despite the circumstances, it is unknown whether the Killing Curse was used by anyone but Voldemort and his Death Eaters during the Battle of Hogwarts. It is also known that use of this curse may go unpunished if there is sufficient evidence that the caster did so under the influence of the Imperius Curse.

Why is the Killing Curse Voldemort’s signature spell?

The Killing Curse was known throughout most of the Wizarding World to be Voldemort’s signature spell. This became common knowledge most likely during the first war, due to his frequent and indiscriminate usage of it; he certainly massacred enough to create an army of Inferi.