Vault of Glass is a pretty sure way to get materials, seems like the only thing that ever dropped for me at least *shrug*
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Yeah :( Organising a group for VoG is so difficult though. I got a legendary weapon engram for completing the Daily Heroic last night and Cryptarch made it into 2x shards, go figure. Only time I don't want ascendant material, I get it. I need more ascendant energies and my luck that the weapon engram turns into shards and not energies, lol