Way to unlock: Automatically, after you reach Skyhold.
Quest giver: -
After the escape from Heaven, you get to Skyhold. You need to learn about the new location and set up new priorities with the advisors. Walk over into the Stronghold, over the stairs from the courtyard. Inside the room, take the second door on the left - you walk into an antechamber with Josephine inside (M12,7a), and behind the next door, there is a council chamber. Talk to Josephine and conduct the conversation during the cutscene. After it ends, you gain access to a new quest "Wicked Eyes and Wicked Hearts", which you can start at the council room (cost: 30 Power points).
Later on, you also need to meet up with Varric and the defense walls (M12,7b). He will acquaint you with Hawk, a Grey Warden. After the conversation, you gain access to Crestwood with the "Find the Warden" quest - you unlock the location at the council room, with 8 Power points.
Rewards for completing the quest:
- New main quest unlocked: Here Lies the Abyss