While exploring Castle Dimitrescu in Resident Evil Village you'll come across a wine room. To unlock a secret door here you will need to find a bottle adorned with Silver Flowers. This is the Sanguis Virginis item. Here's where to get it and where to place it to unlock the secret door in the wine room.
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Resident Evil Village Sanguis Virginis: Where to Get the Bottle With Silver Flowers
To get the Silver Flower bottle in Resident Evil Village you will need to progress through Castle Dimistrescu until you reach the kitchen. This will happen automatically as part of the story. Make sure to check this room for a large pot. You'll pull the Sanguis Virginis out of it.
What to Do With Sanguis Virginis
Once you have the Sanguis Virginis item head back to the Wine Room in Castle Dimitrescu. You can now place it onto the silver bottle holder to the right of the entrance. This will open up a secret door, allowing you to progress through the castle.
That's all you need to know about opening the secret door in the wine room in Resident Evil Village. For more help with the game check out our walkthrough for finding all four Angel Masks. Once you're done there check out our guide on using the Wells littered around the map.