Starting today, November 23rd, you are officially unable to play one of the TTK quests if you are on last-gen.
I don't recall a warning about this expiration date when I purchased Density.
Oh well. Guess I'll just have to...
[spoiler]throw money at the screen. [/spoiler]
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Destiny is already going down the drain so I really don't see this as an issue would rather play fallout 4 with mods than wait for another broken dlc from bungie