I have gotten the vanguard missives probably about 8 times. Every single time I get to choose from:
A Light in the Dark (Thorn)
Toland's Legacy (Bad Juju)
A Dubious Task (Invective)
I had accepted and dropped 2 of them early on when I refused to try PvP. Eventually I accepted them and nutted up and did the PvP parts and completed all three above. (BTW, thank you Bungie for these bounties, I enjoy PvP now because these bounties made me learn enough about it to be enjoyable, even if I am still not great at it)
Have I just been unlucky to not get the other bounty offerings for Super Good Advice, Pocket Infinity, Fate of All Fools or is there some trick to it? I only play Warlock currently, are any of these tied to class?
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You need to do crucible to get the crucible missive which will have the other group of three bounties. Doing nothing but vanguard bounties will only get you the exact same group of bounties.