Resident Evil Village's DLC, The Winter's Expansion is here, including additional Mercenaries content and a new short campaign to playthrough starring Ethan Winter's daughter, Rose Winters. Shortly after the opening sequence of the DLC you will find yourself in Lady Dimitrescu's castle, tasked with finding three masks to obtain a crystal. Here's where you can find all three masks.
The Bronze Mask
You start in the main hall where the statue puzzle is. From here, head to the dining room, which connects to the courtyard and the kitchen. The door to the courtyard is locked with a chain. You can find the bolt cutters in the back right area of the kitchen, which contains one enemy. Grab the bolt cutters and head into the courtyard. The Bronze Mask is actually in the center of the courtyard, but you need to unlock an ability first, so head to the left side of the courtyard and enter.
Inside you will head up a set of stairs and into a library where there are five enemies. There is a ton of goop on the ground that you need to avoid, limiting you to a single path through this area. The next room has a ton of goop on the floor, requiring you to head up some stairs and walk across the top of a bookshelf to knock over a ladder, which you can walk across to clear the room. The next area has a ladder, which you can climb into the attic. Head to the back left section to find a white glowing object, which gives Rose the ability to destroy red glowing bulbs, which will clear away some of the goop.