A Small Problem and Haunted (Optional)

Talk to Varric in The Hanged Man and agree to aid him to start the quest 'Haunted'.

Head to Bartrand’s Estate in Hightown at night. Loot the crate at the entrance.

Continue west, then head north to the upper section of the Estate. Enter the eastern room.

Check the crate after the scene. Start backtracking until a door opens to the middle area.

Head up the steps and check the left room for a chest - complex.

Enter the middle room to trigger a scene and initiate a boss fight against the Ethereal Golem.

The Ethereal Golem uses attacks similar to the Ancient Rock Wraith. After losing one-third of its health, it will summon Shades. This summoning mechanic repeats twice more as its health depletes further, with the Golem turning red on its final phase.

Loot the Ethereal Golem for the Rock Band. A scene will follow.

After the battle, you will have a choice: keep a part of the idol or give it to Varric.

Keeping the idol requires returning to Sandal, who will craft a Primeval Lyrium Rune.

Giving the idol to Varric results in 3 rune slots for Bianca.

Go back up the steps and into the room on the right to find a chest - master and a Ledger.

Return to The Hanged Man to speak with Varric, which concludes the quest chain.