As a true Gryffindor, Neville Longbottom was able to pull the Sword from the Sorting Hat after Harry Potter gave it to him during the Battle of Hogwarts. At the time of the battle, there were two known Horcruxes still in play - The Lost Diadem of Ravenclaw and Voldemort's snake, Nagini.
The Sword is linked to the Sorting Hat it seems. So, in a moment of need, a true Gryffindor would be able to pull the sword out. Neville definitely lived up to the role at this point and needed a weapon, so he was able to get the Sword.
This betrayal ultimately proved to be Griphook's own undoing, as he was murdered by Voldemort alongside the other Goblins who reported the Cup's theft to him and Griphook's death caused the Sword to vanish back into the Sorting Hat.
Much like a wand, the sword of Gryffindor appeared to be almost sentient, responding to appeals for help by Gryffindor's chosen successors. Whenever a "true Gryffindor" needed it, the sword would let itself be pulled out of another of Godric Gryffindor's artefacts — the Sorting Hat.
The sword and the Sorting Hat are inextricably entwined with each other throughout the course of history, mostly because both of them were originally Godric Gryffindor's. Therefore, in the event that a "true Gryffindor" requires its services, it automatically appears to them from inside the Sorting Hat.
How Does Neville Get the Sword of Gryffindor? - Harry Potter Explained
Was Neville the chosen one?
The prophecy is mentioned throughout the series, however, it never exclusively mentions that Harry is The Chosen One and suggests Neville was another option. However, one theory explains why, in reality, this wasn't possible.
When Ginny Weasley, Neville Longbottom, and Luna Lovegood tried to steal the sword from the Headmaster's office, Snape gave the Sword of Gryffindor to Bellatrix Lestrange for safe keeping.
Some children were revealed as late-bloomers rather than Squibs, such as Neville Longbottom, but for others (such as school caretaker Argus Filch) their magic would simply never materialise, which could be hard to accept.
The other was Neville Longbottom. Like Harry, Neville Longbottom was born at the end of July and his parents were also courageous members of the Order of the Phoenix. The Prophecy could have been referencing either of the two boys, but Voldemort decided to apply the Prophecy to Harry.
He was setting things up so that he could give the book to Neville, which Neville could give to Harry, so that Harry could win the underwater task. Another explanation could be that he despised Neville's parents and perhaps felt sorry for Neville for having such weak parents.
They know she's an impostor. They've been warned", so obviously the request for the wand was unexpected even to him. It's thus pretty safe to conclude that the real Bellatrix had reported her wand stolen and alerted Gringotts prior to the trio's attempted break in.
Throughout the history of the wizarding world, there had been rebellions where the goblins had fought against discrimination and prejudice. They were still considered subservient in the minds of most wizards, and they were forbidden by the Ministry from carrying wands, which had led to deep-seated resentment.
Malfoy is also convinced (to a certain extent) that it is Harry, but he isn't so sure, so he asks his son - Draco - if he recognises him. Unfortunately, Malfoy isn't sure of it as well, so Lucius has no evidence or confirmation that it is Harry.
The Sword appearing for Neville in his time of need is Neville's confirmation that he is a true Gryffindor, as he had always doubted his placement in the house since the beginning, wondering why he was not sorted into Hufflepuff.
In Deathly Hallows we reconnected with Griphook. He hadn't teamed up with Voldemort or betrayed anyone - he was on the run and helping Ted, Tonks's father. The goblins wouldn't bow to the so-called superiority of the wizards now in charge of Gringotts. And Griphook made sure that their departure did not go unnoticed…
It was this particular Remembrall that drove Harry Potter into his career as the Seeker for the Gryffindor Quidditch team. When Neville Longbottom accidentally flew into the air in his first flying class, he left it behind when he crashed and broke his wrist. Draco Malfoy took it and threw it high into the air.
What makes Harry explicitly the chosen one in the books is 3 things, 1) Voldemort chose him that night to be the chosen one and decided to kill him and his family personally to avoid the prophecy, 2) Harry and Neville actually talked this out and Harry chose to take the possible responsibility off of Neville and to be ...
Neville isn't the Chosen One because Voldemort 'chose' Harry, by “marking him as his equal”. First of all, Voldemort didn't hear the whole prophecy. He heard only till the part that describes the time of birth, and the parents of the chosen one. He did not hear the part of the dark lord marking him as his equal.
What would have happened if Voldemort chose Neville?
It was answered very eloquently by commenter Sooooo, who explained that we'd have a dead Neville on our hands: The key part of what saved Harry from Voldemort was Lily being given a choice by Voldemort (at Snape's request) to stand aside. Alice Longbottom would not have been afforded the same opportunity.
Probably. All the pure-blood families are related, and on the Black family tree, Draco's great-grandfather's first cousin Callidora Black marries one Harfang Longbottom, who is likely a relation of Neville's.
Hagrid was a pupil at Hogwarts himself and was learning magic along with everyone else - until one horrible day in his third year, when he was expelled (for reasons we discover later on in the series). Although he was able to stay on as gamekeeper, his wand was snapped in half.
Honestly, Hermione knew Dobby was a lost case... nothing could have revived Dobby after the attack or she would have definitely helped Harry with Dobby considering she was the girl who started S.P.E.W(Society for the Elfish welfare) and fought for elf rights. There was nothing to be done at that point.
Did Bellatrix know she had a Horcrux in her vault?
At some point in time, Lord Voldemort gave Bellatrix Lestrange Hufflepuff's Cup, one of his Horcruxes, to keep safe in her vault, though he didn't tell her its true nature.
How did Harry know Hufflepuff Cup was in Bellatrix vault?
The clue he received in the film was from Bellatrix, who was in a frantic frenzy when she thought her vault was broken into. He is ultimately able to identify the cup as a Horcrux because of his ability to hear the piece of Voldemort's soul contained within them, an ability which is not present in the books.
