Been playing since release day, got over 300 hours in (don't remember the exact number), and I still don't have a Legendary version of a void sniper or an arc heavy. Vanguard quartermaster doesn't sell those element damage types of those weapons, and any time I get an engram of that type it decrypts to materials, never a weapon.
Bug? Bad luck? Just another example of what a bad upgrade system Bungie implemented?
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I'd say something like 80 maybe 90% of legendary engrams I get (and it's not a lot so sample size isn't very good) turn into mats instead of guns. Which I won't mind if legendary stuff continues to use ascendant mats in the next expansion. The majority seems to believe/adamantly want all new legendary gear to require radiant mats instead though. Seems to be mostly to screw anyone who doesn't raid and thus wont have said radiant trash.