Best box to get only green items?

What difficulty must i do and how many tomes i must collect in order to get only green items in the box? Really struggling with rerolls because i miss the green dust.

I have my sienna on lvl 5, with recruit boxes (soldier + ) I get the most Greens.

since i dont like the playstile of her i will Keep her for gettin green stuff :smiley:

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