I would love to see all 3 make a comeback, but let’s be honest; only one might make it. I’d say Wrath of the Machine because it was just good fun and not overly complicated.
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CloryxBleachRock Me Amadeus - old
I don't think Crota's End is difficult enough to be considered a raid by Destiny 2 standards, but I could see it coming back as a dungeon.