Running back through a Shooting Stars quest gives I think 8 t6 basic iso per run, not much but something. If you need a lot you can spend a bit of glory on iso selectors.
I almost always have enough class ISO to rank whoever I want, just from opening crystals and content. In the event that I run out of a class I need, I have 30 4* dual crystals of each kind. I sell all basic ISO and class ISO if it's expiring and there isn't a level up event going.
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