system
Given the following post, respond as if you're commenting on Reddit:
human
[Harry Potter] Could Tom Riddle have made the Basilisk into a horcrux?

If so, could anything besides fiendfyre have killed it? How else would the protagonists even begin to stop it?
gpt
It's just a big snake. A committed enough Avada Kedavra would have snuffed it out.

You need a powerful spell in general to destroy a horcrux - but the reason you don't make living things into them is because when the host dies so does the horcrux. It's much easier to kill a big snake than it is to obliterate a heavily enchanted locket.