[GAMEPLAY POST COMING THROUGH]
I'm kind of on the fence about how long I should farm the Nod-Krai sets
The Night Sky (dps set) is probably not going to be used for a whole lot of new characters so if you've already got Flins and/or Nefer chances are you won't ever need another Nod-Krai dps unless Columbina ends up having an on-field playstyle which, admittedly, is very possible.
Think about it, outside of Columbina who are we even going to get as future Nod-Krai reps?
Illuga and Linnea both seem like they'll be the random 'regular people' four stars who release after the story is done, so they'll either be supports or brick DPSes not worth playing outside of IT. That more or less just leaves Nicole and chances are they probably will make a witch themed artifact set for her instead since they seem to be intent on promoting Hexenzirkel parties. Sandrone is kind of up in the air, personally I really don't believe they'll randomly release Lunar Crystallize like 1 or 2 patches before we move on to a new region and abandon Lunar reactions for good in favour of whatever 7.X's gimmick will be.

This set seems nice on paper but on the other hand it's not only limited exclusively to Gleam parties, it can also be used on basically anyone which means you technically don't have to worry about minmaxing stats since you can offload it onto the weakest party member.
I'm honestly heavily considering just crafting the final circlet I'm missing next patch and then going back to farming ley lines, talent books and ascension materials instead