I was wondering if I did the vault of glass on normal and opened the exotic chest, than beat atheon all on normal than did it all on hard mode. Would I be able to get more exotic weapons? Or would it be the same if I did it on hard?
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If you do it on hard, then you get the rewards for both Hard and Normal in terms of loot drops. The only item that can be looted twice is the exotic chest located in the Gorgon's Lair.
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Forte's answer is correct. Most players play HM VoG only so that they receive "double the roll" for exotics per drop.