Just a thought, will the Cryptarch, through leveling up, ever sell anything blue or above? Otherwise, is it just a system for him to send you a package on each level?
Asking this because I have only ever bought greens or below from him in the early game.
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one of my friends is lv.11 for cryptarch and he sells just green and white regardless, i think you get a better loot chance from him as it goes up though