The Forsaken pack includes access to all exotics released during the Forsaken year along with access to the Shattered Throne dungeon and the Last Wish raid. This content was not removed with the release of Witch Queen.
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The entire planet where the quests were is gone
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Are you referring to the Tangled Shore? If so, then yes, it would be as it was removed with the launch of Witch Queen. Any exotic that tied to the Tangled Shore from a quest standpoint has either had their quest updated (like with Wishender) or the exotic was moved to a different source. What quest(s) are you looking for? If you are referring to the Dreaming City, that is still present in the game, as I stated. If it is missing for you please provide an image of your Director screen indicating as such.