I have gotten shinobus vow 10 times now from each exotic engram. I get that it's by chance but it actually just seems like it's stuck giving me this same exotic every time now.
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Sunbracers for me, I must have had 30 of them drop at one time or another. And I have never used them once. Worst single drop? had a '70' Phoenix protocol drop with 8 recovery and 2 discipline...