If you know it, it’s a Harry Potter item that was a scam item itself.

Voldemort’s first Horcrux

Tom Riddle’s diary

Is it easy to find?

It’s just an ordinary muggle diary.

If you don’t know Voldemort’s real name, there’s a 99% chance you won’t recognize him even though he has a name tag on him.

Is it easy to destroy?

The Horcrux itself is nearly indestructible by normal means.

Requires very powerful magic or weapons, such as basilisk poison or demon fire.

Is it easy to guess the connection with other Horcruxes?

It’s just a personal diary.

A representative Horcrux, it has no connection whatsoever with the treasures of the founders of Hogwarts, so even if you find it, it is difficult to guess anything else.

Are the features unique?

Diaries that provide answers to questions are likely to be common in the wizard world.

Even at Hogwarts, talking portraits are plentiful right now.

I’m sure it would have been like that, you little sheep.

Blow it up?