I farmed the B.Skelet 4-2 (after illu.wall) 30+ times and the 4-2 (before adjudicator) 100+ times .. got 0 pure stone. Pureblack tendency, NG+, sword+ring with item discovery bonus. It's really a pain to spend more time on this farm than cleaning the entire map.
That’s actually false. Why make up fake information? You basically sound mad that you didn’t buy the Deluxe Edition, which by the way only really has armor sets that aren’t even that good. The ring doesn’t increase your chances of getting pure bladestone. You’re making up fake info to create fake concern, like a lot of you weird internet nerds do.