Go down to the lobby for a brief cutscene. You’ll learn that your next destination is the Ruswal Opera House located in the Market Quarter. From the hotel, head to the Clarane Market Quarter and as soon as you arrive the barrier to the next area will be opened. Head to the newly opened exit to reach the Opera House.
Once inside the Opera House, fight your way to the central stairs and pick up a Memory Fragment between the stairs. The central stairs is blocked so you have no choice but to take the exit leading to the Balcony area. Take out the enemies that will ambush you and leave the area.
Fight your way to the stairs and the balcony overlooking the stage. This is the part of the Opera House where the doll demons will be appearing. Take note of them spawn points especially if you're planning to complete the quests involving hunting them. They also have the chance to drop Bisque Doll fetishes, perfect for improving your own Bisque Doll servan. The Balcony area has a Door to the far eastern end. The path is very linear and you may have to destroy the obstacles along the way to reach it. Use the door to take a break then use it again to continue your hunt in the area.
From the door, head to the next area a short walk south of it. You'll be in the Central Staircase area, a short walk but still as dangerous as the other paths in the area. From the starting point, check out the dead end in the immediate north to spawn some enemies that will spawn a chest upon defeat. Head to the long corridor and anticipate an ambush from several demons. If your servans have crowd-control abilities, this is the best time to use it. After turning around the corner, you'll be entrapped again by another group of demons. Take them all out to remove the barricades and allow you to move to the next area.
You'll be back in the Opera House Entrance but this time, in the other side of the blocked stairs. Clear the enemies downstairs to remove the barricade leading to the opera hall itself. Don't forget to loot the red chest as well. Make your preparations since there will be a boss fight waiting for you in the other side of the main door. Enter the door to have a conversation with Chris.