Neville is the one who delivers the final blow to Nagini, severing her head with Godric Gryffindor's sword, which was imbued with basilisk venom. This act, though seemingly simple, had significant implications:
* Breaking the Horcrux: Nagini was one of Voldemort's Horcruxes, containing a piece of his soul. By destroying her, Neville helped weaken Voldemort, bringing him closer to defeat.
* Symbolic Victory: Neville's act of courage and defiance against Voldemort was a powerful symbol of the defeat of evil and the victory of good. It showed that even ordinary people could rise to extraordinary acts of bravery when faced with unimaginable odds.
It's important to note that Nagini's death was not simply a physical act but a crucial turning point in the final battle. It symbolized the crumbling of Voldemort's power and the restoration of balance in the world.