This should be relabeled from rare to impossible. RNG on this is ridiculous.
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I ran the Bunker E15 one on Europa. The hardest part is the Overload Captain at the start. I ran it 5 times, got the eyeball chest piece for my hunter. Ran it 5 times with my Titan got the missile chest piece. Each run 7 to 9 mins tops. Find easy ones to run through, make your time feel less wasted.