https://www.gamespot.com/articles/destiny-2-forsaken-where-and-how-to-do-ascendant-c/1100-6461702/

Destiny 2's new Forsaken DLC introduces a wide variety of new content to take part in. We're still waiting for the Raid to unlock, but once you've made your way through the campaign, you will get access to an entirely new area called the Dreaming City. From there, you can take part in activities like the Blind Well and what's known as the Ascendant Challenge weekly bounty. Here's where to go and how to complete the bounty for Week 2. [Update: The Raid is now out along with a variety of new activities, and the deadline is approaching to complete this bounty before the new Ascendant Challenge takes its place after the weekly reset on Tuesday.]