Avada Kedavra is one of the most powerful and dangerous spells in the Harry Potter universe. It is a Killing Curse, and is the only known spell that is capable of killing a person instantly. It is also known as the “Unforgivable Curse” because it is so powerful and so dangerous that it is illegal to use.
Avada Kedavra has been used a total of eight times throughout the Harry Potter series. The first time it was used was by Voldemort himself, when he killed Harry’s parents. The second time it was used was by Voldemort when he tried to kill Harry in the graveyard. The third time it was used was by Voldemort when he tried to kill Harry in the Ministry of Magic. The fourth time it was used was by Bellatrix Lestrange when she killed Sirius Black. The fifth time it was used was by Voldemort when he killed Dumbledore. The sixth time it was used was by Voldemort when he killed Severus Snape. The seventh time it was used was by Voldemort when he tried to kill Harry in the Battle of Hogwarts. The eighth and final time it was used was by Voldemort when he tried to kill Harry in the Forbidden Forest.
Avada Kedavra is a powerful and dangerous spell, and it is clear why it is illegal to use. It is a spell that should only be used in the most dire of circumstances, and it is clear why it is so feared. It is a spell that has been used eight times throughout the Harry Potter series, and each time it has had devastating consequences.