I used to spend collecting materials and trading them in with Roni for Vanguard marks. But that option is no longer therre. Instead he/she takes your vanguard marks and gives you more materials. But what use are they now? Are they just for upgrading weapons?
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Actually farming materials is far more efficient than buying them from a vendor and marks are better saved for gear. The material vendors just make it easier for those with no patience or time to farm.
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Upgrading weapons and armor