I checked in game, and asked too and no one seems to find an use for the Pillarnium Stones for Crafting, and then this post confirmed that they have no use:
Pillarnium Stones were suppose to be used for Artisan's new crafts Blessings, but somehow, I have no idea how, that doesn't appear the case anymore. They give a +% atk in 3 levels. It was suppose to be for I or II. That, I don't remember. I was talking to someone the other day and apparently that isn't the case anymore......and I don't know why.
So long story short, pillarnium stones have no use whatsoever anymore and it makes no sense. Now if I'm wrong again, please do correct me. Check the Blacksmith crafts too since they have a new craft for +% def. Either way, I think pillarnium stones somehow disappeared from usage.
So, my suggestion is to make them breakable to get pillarnium fragments or powder, or make it refinable to get low level pillarnium, or just get rid of it completely, since it doesn't make sense that it exists right now.
