The luckiest loot drop I've ever gotten aside from get 2 exotics after beating atheon, when I turned in my legendary engram to the cryptarch when he was known by various different names (vets will know) and I got an exotic instead of a green
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I never got an exotic from him before he was patched to only give blues and up from blues and such. That's some great luck :)
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Yeah I was pretty lucky. After that though it was nothing but greens and blues until he got patched