So I may be late to the party here but it would appear that only Raid drops and prime engrams go above 585? I honestly love the change, gives me them D1 feels for the last 15 levels.
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#destiny2
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Only raids, Petra’s weeklys and tier 4 are +5s. Primes drop at least +5 from any activity all the way to 600. Once you get 595 primes are guaranteed at 600.
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Those two and either nightfall or Petra's weekly those are what help you get to the end.