Harry Potter and the Deathly Hallows
How did Harry learn the sword of Gryffindor could destroy horcruxes?
harry potter and the deathly hallows
harry potter and the deathly hallows
Phineas tells Harry and Hernione that sword was imbued with the basilisk venom, which provided it with the power it to destroy Horcruxes. Basilisk venom will damage them beyond magical repair.
Harry Potter and the Deathly Hallows