There are two problems here.
1: It is impossible to craft above 585 gear with arcana due to an ingredient not counting as +15.
2: Even the legendary recipes that should allow us to make 600gs items are bugged due to the fact it requires items that cannot be dropped.
What this means is that it’s impossible to craft anything ‘endgame’ for the staff/gauntlet users, while every other class has multiple options.
I am not even going to ask you to fix the problem. I really would like that you are aware of these issues. Also, that you are aware of the correlation here that BOTH bugs impact arcana and thus any staff/gauntlet users. Which makes this actually a lot more annoying for everyone.
Please address this issue in the way that it gets confirmation and that it’s placed on the known bug list. I’m not going to have a discussion on the details. For this, I would like to point out a selection of other topics about it which contains the actual details, explanation, and facts that it is broken.