I'm almost sure the code for them to drop will still be in the game with the year one raids and activities. Since you can't get a dragon's breath or No Land Beyond out of the exotic chest in the vault, I think it just has the codes for the year one exotics.
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hope fully they'll still drop. regardless of their efficiency in TTK, i would like to get them for collection sake.
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You're talking to the guy that has organized his vault by raid sets of weapons. I know that feeling all too well. Lol