As probably very well know, you can buy black potions in the Minotaur Labyrinth in Ravage Roaming and at the alchemist shop on Regna Island. It seems that at a certain point, black potions seem to stop permanently raising your stats (might, accuracy, etc.) and simply do nothing at all. It seems like I usually can buy one or two for one stat and then they do nothing at all. What is the limit for black potions, and is there anyway around that?
I notice that you can still use a barrel to raise the stat further.