Im sat somewhere above 75 vanguard and have had merciless, wardcliff and sturm drop sofar so maybe its every 25 vanguard or something like that
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It’s not tied to vanguard rank. Just has a horrible drop rate and complete rng. I barely play crucible but have all except the colony catalyst. Play strikes a good bit and haven’t got a single one.
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Sturm isn't a strike catalyst