I'm sorry for my bad english that makes you feel confuse to understand my post.

Yes.
But of course Oversoul in FF XII.
He drops Soul of Thamasa rarely.

And for pebble , even we can make it by selling some solid stone.

Black Orb too , i dont know what it is for other than feed it to pedestal of night.
All complete , i almost ignore all Black Orb by the monster slain.
Sell it ?
its price is very awful.