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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There was a time where I got apothesis veil like 8 times in a row, thankfully I have good god rolled legendary pieces so at the time I had to rely on the collections until my RNG finally stopped giving me that trash exotic.