One of the coolest things I've ever experienced in the Destiny series as a whole was the alternate path Black Spindle encounter in the Taken King campaign. I want more reasons to return to the campaign and I also think Adept weapons from Master Campaign Missions would be cool as an endgame pursuit for players who don't like Raiding.
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Anyone remember the D1 Sleeper Simulant quest? Where the quest secretly became available on the 7th of the month and it had a puzzle tied to it? That's what I miss.