“...lucky we’ve got such a large supply of basilisk fangs, then ...I was wondering what we were going to do with them.”
-- Ron Weasley (DH6)
Fangs and venom from the dreaded giant serpent that once lived in the Chamber of Secrets have magical properties.
- The fangs of the Basilisk are filled with deadly poison (FB).
- Harry was pierced by one in the Chamber of Secrets and would have died if not for the tears of Fawkes the phoenix (CS17). He also discovered that a fang could be used to destroy Tom Riddle's diary, a Horcrux. In fact, Basilisk venom is the one "foolproof" way to destroy a Horcrux, according to Hermione (DH6).
- The Horcrux inside Harry's scar was not destroyed by the Basilisk venom because "The Horcrux-receptacle has to be destroyed beyond repair, so Harry would need to have DIED" (JKR:Tw).
- The Sword of Gryffindor was "impregnated with basilisk venom" by the Goblins who made it, which is why it could destroy Horcruxes (DH15).
- After the Battle of Hogwarts, Ron Weasley and Hermione Granger gathered more fangs and used them to destroy another Horcrux, the Hufflepuff Cup (DH31).
- Salazar Slytherin's wand contained a Basilisk horn core which could still understand Parseltongue; Gormlaith Gaunt used a word meaning "wand sleep" to render it useless when she attacked Isolt Sayre's family at Ilvermorny School (Pm).