how to open a 9slot of a profession? (complete quests at Rank 3) (Neverwinter Online)

-Lord-Ema-
In the same place as all professions, you just need to use purple tools (in all 3 cells), for example, in processing black ice you need to use 3 mithril engravers, although the chance is not great, but it is quite possible to get rank 3

As mentioned above, you need exactly 3 purple instruments and a chance of about 60% that the 9th slot will open. I did it the first time when the tailor crafted a shirt for himself with a cell under a stone)