(edited by Kovac.4372)
Cost-efficient obsidian shards? karma
I would do it by budgeting karma. Set some minimum amount of karma you want to save to buy them directly from Balthazar (leave yourself enough to buy like 400 maybe; if you get unlucky with the boxes you can just farm more karma and come back later). Then buy boxes until you hit that level of karma. Then refill your karma from the boxes and repeat.
If you do the boxes first you can continually adjust the amount you need from the priest down (and hence afford even more boxes) when they contain shards, but they’re too unpredictable to try and rely on them. Make sure you can always go to Balthazar afterwards to get what you need.
Hobwash
[TAS] – The Asuran Squad
Devona’s Rest
[TAS] – The Asuran Squad
Devona’s Rest