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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I'm level 18 cryptarch. And one of my mates was level 28? I think I still get mainly Blues from purple engrams so I doubt it changes anything. I believe it's just a free engram reward thing. I farmed the engram cave for 3.5 hours in one hit a week ago and went back to the tower and leveled up the cryptarch 3 times with one trip lol, got an exotic gun called ThunderLord. But I got lucky lol.