Harry Potter and the Deathly Hallows Part 2: Voldemort used his Horcrux snake Nagini to kill Severus Snape instead of his favorite Unforgivable Curse, Avada Kedavra used to kill Snape in the first movie. Voldemort used the Killing Curse on several people in the Harry Potter movies, based on J.K. Rowling’s books of the same name. This includes Alastor Moody, Lily and James Potter, and many others. However, he didn’t always use Avada Kedavra to kill his enemies. He also killed people by accident (such as Myrtle Warren with the Basilisk or Cedric Diggory through ordering Wormtail to kill him). Snape’s death was tragic, but it was different because of this.
The Harry Potter movies show that Snape changes his allegiance between Dumbledore and Voldemort. Through Snape’s tears, only in the last film does it become clear that Snape had always been on the side of good. He swore to protect Harry and did Dumbledore’s work in the war against Voldemort, including the difficult task of infiltrating the Death Eaters. A killing curse was used to make Voldemort more trusting of Snape. In one of Snape’s most demanding jobs, he had to kill Dumbledore when Draco Malfoy (Tom Felton) couldn’t do it. Dumbledore was already dead after putting on Marvolo Gaunt’s ring. When Voldemort saw The Half-Blood Prince, he thought that Snape had the Elder Wand after that.
Voldemort tells Snape that even though he took the Elder Wand from Dumbledore’s grave, it doesn’t seem to work for him. In his mind, he thinks that because Snape killed Dumbledore, the Elder Wand belongs to him. Voldemort must kill Snape to get the wand’s allegiance to change, so Snape must die. Voldemort knew that he couldn’t use Avada Kedavra with the Elder Want to kill its master, so he asked Nagini to do it for him, and she did it. Many people thought Snape was a loyal Death Eater at the time of his death. In reality, Draco had the Elder Wand because he took Dumbledore’s weapon away from him in the Astronomy Tower. This means that Voldemort didn’t think Snape was loyal at his death.
Voldemort’s trust in Snape opens up a new theory about Voldemort’s method of killing people. Even though Snape died at the end of the Harry Potter storyline, he could still play a perfect double agent until his death. At the end of the storyline, Snape was even more trusted by Voldemort than Lucius Malfoy was by Jason Isaacs. Voldemort may have thought that Snape was significant enough that he wanted Nagini to bite him. And he was secretly hoping that Snape would be able to fight off the attack. At the very least, Snape lives long enough to have one last meaningful conversation with Harry, making sure that Harry understands why he is loyal to Lily and Dumbledore. If Voldemort had used Avada Kedavra on Snape, it wouldn’t have been possible for this to happen.
In the end, Voldemort’s confusion about Elder Wand’s allegiance helped Harry win the duel against him. As soon as Harry takes Draco’s regular wand after a fight. He becomes the owner of the Elder Wand, which is very powerful. Disarming Draco in any way meant that Harry now owns the Elder Wand. Even though he didn’t know this until his last duel with Voldemort at Hogwarts. When Voldemort wants to use Avada Kedavra on Harry, the wand is on his side. Voldemort kills Harry instead. Voldemort dies in Harry Potter and the Deathly Hallows because he thinks the Elder Wand belonged to Snape and then to himself, even though it belonged to him.