This was by far the best secret mission destiny has ever seen. I will even go as far to say this was better than the black spindle mission in D1. Bungo you know what to do.
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They probably stopped doing these kind of surprises because players wants to know EVERYTHING before it gets released. Even if it means data mining / leaking infos. Honestly i would be pissed if i was preparing a surprise just to see a ton of dumbdumb showing it everywhere on social medias before it gets released x)