Some of Destiny 2's most notable content have, historically, been the game's various raids. However, the Witch Queen expansion may be the first time that Bungie is attempting to extend its trademark gameplay mechanics to the basic campaign content. According to Bungie, this ties in with its efforts to make this new campaign more similar to Doom or Halo.
Bungie's Destiny 2 game director, Joe Blackburn, has gone on record saying that the Witch Queen campaign will attempt to bridge the «canyon» between a baseline Destiny campaign and fully-fledged raid content. To that end, players should expect a more involved and mechanically challenging experience as they progress through the Witch Queen story.
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Though Blackburn wasn't interested in spoiling anything about the Witch Queen raid, which takes place in a broken-down Darkness pyramid, he did explain that Bungie's goal is to make the players' transition from campaign content to hardcore raiding significantly easier. The fact that Witch Queen is launching with a legendary campaign only underlines this further. Raids are, in most cases, a continuation of the campaign narrative, and it's Bungie's goal to make them more inviting to a greater number of people.
Blackburn's interview suggests that the Witch Queen campaign will wrap up satisfyingly enough, but that the raid will inevitably continue moving the narrative forward. The fact that four entirely new Void 3.0 abilities are still unrevealed, and will only end up getting unlocked after the world's first Witch Queen raid completion, suggests that players should expect at least a few major story beats. Perhaps even something along the lines of Dreaming City
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