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?