Dumbledore left Harry the Resurrection Stone (disguised in a Snitch) in his will, and Harry uses it just before he goes to battle Voldemort. However, he doesn't use it to try to bring the dead back for an extended period or anything.
The Resurrection Stone
'No spell can reawaken the dead', Dumbledore once told Harry – although this legendary stone possesses magic that comes close. As told in 'The Tale of the Three Brothers', the Resurrection Stone has the power to bring loved ones back from the grave – but at a cost.
Harry didn't die, because the Avada Kedavra curse can kill only one soul at a time. Therefore, it did destroy Voldemort's soul fragment that lived inside Harry, but not Harry himself.
Harry didn't want Voldemort getting the Stone
He truly thought that there was no way out for him and he didn't want Voldemort or his evil cronies to get their hands on the stone. So he hid it the best way he could in the short time he had: by dropping it amidst similar-looking ordinary stones.
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.
Narcissa Malfoy's Very Dangerous Lie
But she was also a mother, which meant she was willing to risk everything to make sure her son was safe. When Harry survived Voldemort's Killing Curse for the second time, Narcissa pretended he was dead so she could get to Draco.
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.
When Voldemort asked her to check if Harry was dead and she realised he was, in fact, still breathing, Narcissa seized her opportunity. Harry revealed that Draco was still very much alive, and she lied to her master in order to get closer to him.
Sure enough, when Harry went to the Forbidden Forest to meet Voldemort in the final film, he raised the Snitch to his lips and whispered, 'I am about to die'. The Snitch fell open revealing the Resurrection Stone, one of the three Deathly Hallows.
She wanted to see Draco before anyone could kill him for his affiliation with the Dark Lord. Whether or not Harry was alive the answer was always going to be the same so that she could quickly see Draco.
Voldemort was scared it had gone wrong and was nervous to check. It was only when Narcissa checked that his arrogance returned. Only then he made up lies about Harry running despite all DE and Hagrid knowing that wasn't true.
Because he didn't need to. The Stone, as explained in the book, only brings the people you want back partially. It doesn't actually bring back dead people to life.
The temptation of being able to use the Stone was too much for Dumbledore to resist. He put on the ring because he thought the stone would give him a chance to see his dead mother and sister again (DH33,DH35).
At different points, Dumbledore possessed all three Deathly Hallows. He won the Elder Wand from Grindelwald, had the Invisibility Cloak in his possession when James Potter died, and wore the Resurrection Stone as it sat in Marvolo Gaunt's ring. Dumbledore's powers are really quite extraordinary!
Its magic was last used to recall Lily, James, Sirius and Lupin as Harry prepared to face death. Voldemort himself never learned the significance of the stone.
Dumbledore left Harry the Resurrection Stone (disguised in a Snitch) in his will, and Harry uses it just before he goes to battle Voldemort. However, he doesn't use it to try to bring the dead back for an extended period or anything.
After spending many months looking into Voldemort's past, Albus Dumbledore was able to track down the location of the ring and retrieve it. Though he had long since abandoned his personal quest to find the Deathly Hallows, he immediately realised that this ring contained the Resurrection Stone.
Among the changes: In the book, after Harry uses the Resurrection Stone to see his parents, Lupin, and Sirius, Rowling describes them walking beside him until right before he announces his arrival to Voldemort.
James inherited the cloak from his father, Fleamont Potter, who inherited it as a descendant of Iolanthe Peverell -- a granddaughter of Ignotus Peverell. The cloak passed down through generations of the family until it reached James and then Harry.
Draco's refusal to reveal Harry's identity to Bellatrix was not because he liked him. It was because he believed that Harry was the only chance they had at defeating Voldemort. At first, Draco admired and revered Voldemort until he threatened his family's safety.
In fact, Lucius' own support to Voldemort is revealed to come only under some form of duress, which is likely Narcissa's Veela Allure. When Lucius turns on Voldemort due to the reveal of his Horcruxes, Narcissa divorces him, taking 75% of Malfoy's wealth with her.
Though Narcissa may not necessarily have agreed with all of bellatrix's life decisions, and her views, she certainly loved her sister, and will have certainly mourned her death.
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.
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.
Defeating The Dark Lord with his signature spell
Disarming is about defence, not murder. Voldemort was a killer, Harry was not. It was an important distinction for Harry, who had learned so much about Voldemort and seen first-hand the ways in which they were similar.