Item from Deathly Hallows by J.K. Rowling
Goblin-made silver sword impregnated with Basilisk venom -- it appears to any true Gryffindor in need. Snape delivered it to Harry. Ron used it to destroy the locket. Neville pulled it from the burning Sorting Hat to kill Nagini.
Also known as: the Sword of Gryffindor, Gryffindor's sword, the sword