I tried looking this up already and it doesn't seem like it's in the game anymore I just don't get how it was mentioned in the video if it's not able to be obtained anymore?
I only give it a brief mention because it's difficult to obtain, you can still get it if you have characters that are a few years old and that were on the early stages of the balenos/serendia quest line. Since if you're really try Harding which replacing the rings is then you're better off with crit cup upgraded rings anyway. Liking your own comments won't change whether I reply to questions or not btw for future reference.